All files / engine/Source/DataSources CzmlDataSource.js

97.81% Statements 1301/1330
88.19% Branches 635/720
95.32% Functions 102/107
97.98% Lines 1267/1293

Press n or j to go to the next uncovered block, b, p or k for the previous block.

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  121x 121x 242x 242x 242x 242x 242x   121x       40x 40x 23x         17x       13x 13x 6x     7x 7x 1x     6x 6x 3x               3x 3x 6x 6x 6x 6x 6x   3x       6x 6x 6x 3x 3x 3x 3x     3x 3x 6x   6x 6x 6x   6x 6x 6x   3x       4x 4x 2x 2x 2x 2x 2x     2x 2x 4x   4x 4x 4x 4x   4x 4x 4x   2x       7x 7x 4x 4x 4x 4x       4x     3x 3x 6x   6x 6x 6x 6x         6x 6x 6x   3x       18x 18x 10x     10x 10x 10x       10x     8x 8x 14x   14x     14x     14x 14x         14x 14x 14x   8x       152x 152x 109x     43x 43x 2x     41x 41x 6x     35x 35x 6x     29x 29x 4x     25x 25x 7x     18x 18x 18x                 21x 21x 21x       15x 15x 9x 9x     6x 12x     6x       5779x 5779x 5779x       16x 16x 16x 9x 9x     7x 5770x     7x                           97x 1x 96x 3x 93x 3x 90x 6x 84x 6x 78x 6x 72x 6x 66x           13x 53x       4x 49x       8x 41x   41x   41x 1x 40x 1x 39x 1x 38x 1x 37x 3x 34x 1x 33x 5x 28x 2x 26x   26x       10x 16x 2x 14x 1x 13x 3x 10x 1x 9x       4x 5x 1x 4x 1x     3x           2496x   3x   61x   323x   9x   177x   61x   15x   624x   10x       4x   6x   20x   47x   35x   5x   26x   761x   30x   30x   10x   16x   18x           29x       98x   13x   13x   5x   47x           1x             824x 824x 824x 306x           824x 824x 2x       824x 824x 2x     824x 824x 2x         824x 824x 2x       1x         4383x 3693x   690x 690x       6x 6x 6x         3x 3x 3x         2x 2x 2x                       2990x 2990x 74x 2x           72x                             2990x   2990x     2990x   18x 14x 14x       4x     2972x   2972x 2496x 2496x   2x   2494x 2494x 2494x                 2970x     2970x 1888x 1415x       473x           1888x     1082x     1082x 1082x 780x         1082x 500x 500x   500x 500x 500x               582x   291x 291x 288x       3x               291x 128x         291x   286x 5x   3x 1x   3x     2x     2x 1x   2x     291x       291x 25x       291x 1x       291x 291x 291x   291x 291x 291x   291x 291x       7x 4x 4x 3x 1x 1x 2x 1x 1x 3x         3x   3x       1x 1x                         10706x 8218x     2488x 65x 470x                     2423x                                       99x 99x                       99x 99x     99x   99x     99x   15x 12x 12x       3x       84x   84x 76x 15x   76x 76x 76x 76x       84x 43x 37x         6x         43x     41x     41x 41x 26x         41x 30x       30x         30x 30x 30x               11x   8x 8x 6x   2x             8x 4x 3x   1x   4x     8x             4x 4x   3x 1x         3x     1x       1x 1x         1x     8x       3x 1x     2x   1x         3x 3x 3x           3x 3x       3x   3x 3x       6x 3x 3x 3x 1x 1x 2x 1x 1x 3x         3x   3x       1x 1x                       95x       95x 6x 10x                   89x                                 3x                     3x 2x 1x   1x     3x 3x                                         474x 474x 6x 2x           4x       474x       474x 9x 6x 6x     9x 9x       9x     1x     8x 8x     465x       474x 105x 104x   105x 105x                 369x 61x 61x   61x 61x                 61x                 61x                 61x                 61x                 308x 60x 60x   60x 60x                 60x                 60x                 60x                 248x 84x 84x   84x 84x                 84x                 84x                 84x                 84x                 164x 26x 26x   26x 26x                 26x                 26x                 138x 16x 16x   16x 16x                 16x                 16x                 122x 16x 16x   16x 16x                 106x 22x 22x   22x 22x                 22x                 22x                 22x                 84x 84x 84x   84x 84x                 84x                 84x                     474x 9x   465x                       656x 184x     472x 3x 5x                   469x                       1166x 1166x 40x         1166x 1166x 43x                         1166x 1166x 95x                       1166x 1166x 4x                         1166x 1166x 11x                         1166x 1166x 19x 15x             19x 86x 86x 80x     86x 86x 10x 21x                     76x                                               26x 55x     26x 2x 2x 2x         1x 1x   1x     2x 2x   24x                   10x 10x 6x                   4x                         72x 63x     9x 1x 2x               8x                   54x 54x 18x                   36x 10x 26x 11x       15x 15x           36x 36x                                     287x 236x     51x 5x 8x               46x                   3x       3x       10x                 13x 13x 2x 2x 2x                 2x   2x   11x 2x 9x 2x     7x 7x         11x 11x                                     52x 41x     11x 4x 6x               7x                   35x 32x     3x                   3x         1166x 1166x 1127x       39x 10x 72x 10x   72x     29x 29x   39x                   82x 68x     14x                       1166x 1166x 1084x     82x 82x 82x 65x     82x                 82x                 82x                 82x                 82x                 82x                 82x                 82x                 82x                 82x                 82x             82x                 82x                 82x                 82x                 82x                 82x                 82x                 82x                 82x                       1166x 1166x 1134x     32x 32x 32x 32x     32x                 32x                 32x                 32x                 32x               32x                 32x                 32x                 32x                 32x                       1166x 1166x 1132x     34x 34x 34x 34x     34x                 34x           34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x               34x                 34x                 34x                 34x                 34x                 34x                 34x                       1166x 1166x 1134x     32x 32x 32x 32x     32x                 32x                 32x                 32x                 32x                 32x                 32x               32x                 32x                 32x                 32x                 32x                 32x                 32x                       163x 163x 160x 160x 160x 160x     160x         163x 2x         161x   161x 12x     161x 161x 24x 24x 23x               1x 1x 1x 1x 1x           1166x 1166x 1132x     34x 34x 34x 34x     34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x               34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                       1166x 1166x 1132x     34x 34x 34x 34x     34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x               34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                       1166x 1166x 1132x     34x 34x 34x 34x     34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                 34x                       1166x 1166x 1155x     11x 11x 11x 11x     11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                 11x                     11x 11x 5x 1x 2x                 4x                   11x 11x 5x 1x 2x                 4x                                   6x 6x 3x 2x           1x       6x 6x 6x 8x 8x 2x     6x 6x       6x 5x     6x 5x     6x 6x 5x       6x                 6x                 6x                                     6x 6x 3x 2x           1x       6x 6x 6x 16x 16x 2x     14x 14x       14x 5x     14x 11x     14x                         1166x 1166x 1097x     69x 69x 69x 69x     69x                 69x                 69x                 69x                 69x                 69x               69x                       1166x 1166x 1142x     24x 24x 24x 24x     24x                 24x                 24x                 24x                 24x                 24x                 24x                 24x                 24x                 24x                       19x 19x     1x     9x 9x 9x               38x         1x   18x 16x       18x 12x 12x 12x 18x         18x 17x     1x 1x 1x     1x                   1166x 1166x 1114x     52x 52x 52x 51x     52x                         52x           52x           52x 19x     52x                 52x                 52x                 52x                 52x                 52x                 52x                 52x               52x                 52x                 52x                 52x                 52x                 52x                 52x                 52x                 52x                 52x                 52x                       4x       1166x 1166x 1036x     130x 130x 130x 130x     130x                 130x           130x                 130x                 130x               130x               130x                 130x                 130x                 130x                 130x                 130x                     130x 3x 3x                 3x               1166x 1166x 1131x     35x 35x 35x 35x     35x           35x           35x                 35x                 35x                 35x               35x                 35x                 35x                 35x                 35x                 35x                       1166x 1166x 1128x     38x 38x 38x 38x     38x                 38x                 38x                 38x                 38x                 38x                 38x                 38x                 38x                 38x                 38x               38x                 38x                 38x                 38x                 38x                 38x                 38x                       1166x 1166x 1163x     3x 3x 3x 3x     3x                 3x                 3x                       1166x 1166x 1130x     36x 36x 36x 36x     36x                 36x 36x           36x           36x                 36x                 36x               36x                 36x                 36x                 36x                 36x                                   1331x 1331x 82x     1331x   1331x 1x         1330x 1x 1329x 163x   1166x   1166x 1166x 21x     1166x 26818x       1328x         187x 187x 162x 159x 159x 3x 3x 3x 3x   3x 3x 3x 3x 3x 3x 3x 3x 3x     159x     25x 4x   21x 21x 21x 21x 21x 21x 21x     25x 25x 25x 25x     25x 16x   25x 16x   25x 16x     25x 16x     25x 23x 23x     2x         194x 2x       192x   192x 192x     192x 192x 1x   192x     192x 4x 4x 4x     4x 4x 4x               192x   192x   192x   190x     5x 5x 5x 5x         190x 190x   190x 154x 154x 154x     190x               187x   187x 187x       11x 11x 176x 12x 12x     187x 187x 34x     187x       314x 314x                                           160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x 160x                     1x 135x     1x               4x                       38x                   1449x                   5x                   24x                   3x                                       5x     2x                       18x                                   2x                                           1x                                                             1x 1x 1x                 1x 1x 1x 1x                       1x 38x                     1x 156x                       1x                                 1x                           1x                           1x   1x             190x   190x 154x 1295x                 36x                    
import ArcType from "../Core/ArcType.js";
import BoundingRectangle from "../Core/BoundingRectangle.js";
import Cartesian2 from "../Core/Cartesian2.js";
import Cartesian3 from "../Core/Cartesian3.js";
import Cartographic from "../Core/Cartographic.js";
import ClockRange from "../Core/ClockRange.js";
import ClockStep from "../Core/ClockStep.js";
import Color from "../Core/Color.js";
import CornerType from "../Core/CornerType.js";
import Credit from "../Core/Credit.js";
import createGuid from "../Core/createGuid.js";
import Frozen from "../Core/Frozen.js";
import defined from "../Core/defined.js";
import DeveloperError from "../Core/DeveloperError.js";
import DistanceDisplayCondition from "../Core/DistanceDisplayCondition.js";
import Ellipsoid from "../Core/Ellipsoid.js";
import Event from "../Core/Event.js";
import ExtrapolationType from "../Core/ExtrapolationType.js";
import getFilenameFromUri from "../Core/getFilenameFromUri.js";
import HermitePolynomialApproximation from "../Core/HermitePolynomialApproximation.js";
import Iso8601 from "../Core/Iso8601.js";
import JulianDate from "../Core/JulianDate.js";
import LagrangePolynomialApproximation from "../Core/LagrangePolynomialApproximation.js";
import LinearApproximation from "../Core/LinearApproximation.js";
import CesiumMath from "../Core/Math.js";
import NearFarScalar from "../Core/NearFarScalar.js";
import PolygonHierarchy from "../Core/PolygonHierarchy.js";
import Quaternion from "../Core/Quaternion.js";
import Rectangle from "../Core/Rectangle.js";
import ReferenceFrame from "../Core/ReferenceFrame.js";
import Resource from "../Core/Resource.js";
import RuntimeError from "../Core/RuntimeError.js";
import Spherical from "../Core/Spherical.js";
import TimeInterval from "../Core/TimeInterval.js";
import TimeIntervalCollection from "../Core/TimeIntervalCollection.js";
import ClassificationType from "../Scene/ClassificationType.js";
import ColorBlendMode from "../Scene/ColorBlendMode.js";
import HeightReference from "../Scene/HeightReference.js";
import HorizontalOrigin from "../Scene/HorizontalOrigin.js";
import LabelStyle from "../Scene/LabelStyle.js";
import ShadowMode from "../Scene/ShadowMode.js";
import VerticalOrigin from "../Scene/VerticalOrigin.js";
import Uri from "urijs";
import BillboardGraphics from "./BillboardGraphics.js";
import BoxGraphics from "./BoxGraphics.js";
import CallbackProperty from "./CallbackProperty.js";
import CheckerboardMaterialProperty from "./CheckerboardMaterialProperty.js";
import ColorMaterialProperty from "./ColorMaterialProperty.js";
import CompositeMaterialProperty from "./CompositeMaterialProperty.js";
import CompositePositionProperty from "./CompositePositionProperty.js";
import CompositeProperty from "./CompositeProperty.js";
import ConstantPositionProperty from "./ConstantPositionProperty.js";
import ConstantProperty from "./ConstantProperty.js";
import CorridorGraphics from "./CorridorGraphics.js";
import CylinderGraphics from "./CylinderGraphics.js";
import DataSource from "./DataSource.js";
import DataSourceClock from "./DataSourceClock.js";
import EllipseGraphics from "./EllipseGraphics.js";
import EllipsoidGraphics from "./EllipsoidGraphics.js";
import EntityCluster from "./EntityCluster.js";
import EntityCollection from "./EntityCollection.js";
import GridMaterialProperty from "./GridMaterialProperty.js";
import ImageMaterialProperty from "./ImageMaterialProperty.js";
import LabelGraphics from "./LabelGraphics.js";
import ModelGraphics from "./ModelGraphics.js";
import NodeTransformationProperty from "./NodeTransformationProperty.js";
import PathGraphics from "./PathGraphics.js";
import PointGraphics from "./PointGraphics.js";
import PolygonGraphics from "./PolygonGraphics.js";
import PolylineArrowMaterialProperty from "./PolylineArrowMaterialProperty.js";
import PolylineDashMaterialProperty from "./PolylineDashMaterialProperty.js";
import PolylineGlowMaterialProperty from "./PolylineGlowMaterialProperty.js";
import PolylineGraphics from "./PolylineGraphics.js";
import PolylineOutlineMaterialProperty from "./PolylineOutlineMaterialProperty.js";
import PolylineVolumeGraphics from "./PolylineVolumeGraphics.js";
import PositionPropertyArray from "./PositionPropertyArray.js";
import Property from "./Property.js";
import PropertyArray from "./PropertyArray.js";
import PropertyBag from "./PropertyBag.js";
import RectangleGraphics from "./RectangleGraphics.js";
import ReferenceProperty from "./ReferenceProperty.js";
import Rotation from "./Rotation.js";
import SampledPositionProperty from "./SampledPositionProperty.js";
import SampledProperty from "./SampledProperty.js";
import StripeMaterialProperty from "./StripeMaterialProperty.js";
import StripeOrientation from "./StripeOrientation.js";
import TimeIntervalCollectionPositionProperty from "./TimeIntervalCollectionPositionProperty.js";
import TimeIntervalCollectionProperty from "./TimeIntervalCollectionProperty.js";
import VelocityOrientationProperty from "./VelocityOrientationProperty.js";
import VelocityVectorProperty from "./VelocityVectorProperty.js";
import WallGraphics from "./WallGraphics.js";
import Cesium3DTilesetGraphics from "./Cesium3DTilesetGraphics.js";
import SensorVolumePortionToDisplay from "../Scene/SensorVolumePortionToDisplay.js";
 
// A marker type to distinguish CZML properties where we need to end up with a unit vector.
// The data is still loaded into Cartesian3 objects but they are normalized.
function UnitCartesian3() {}
UnitCartesian3.packedLength = Cartesian3.packedLength;
UnitCartesian3.unpack = Cartesian3.unpack;
UnitCartesian3.pack = Cartesian3.pack;
 
// As a side note, for the purposes of CZML, Quaternion always indicates a unit quaternion.
 
let currentId;
 
function createReferenceProperty(entityCollection, referenceString) {
  if (referenceString[0] === "#") {
    referenceString = currentId + referenceString;
  }
  return ReferenceProperty.fromString(entityCollection, referenceString);
}
 
function createSpecializedProperty(type, entityCollection, packetData) {
  if (defined(packetData.reference)) {
    return createReferenceProperty(entityCollection, packetData.reference);
  }
 
  Eif (defined(packetData.velocityReference)) {
    const referenceProperty = createReferenceProperty(
      entityCollection,
      packetData.velocityReference,
    );
    switch (type) {
      case Cartesian3:
      case UnitCartesian3:
        return new VelocityVectorProperty(
          referenceProperty,
          type === UnitCartesian3,
        );
      case Quaternion:
        return new VelocityOrientationProperty(referenceProperty);
    }
  }
 
  throw new RuntimeError(`${JSON.stringify(packetData)} is not valid CZML.`);
}
 
function createAdapterProperty(property, adapterFunction) {
  return new CallbackProperty(function (time, result) {
    return adapterFunction(property.getValue(time, result));
  }, property.isConstant);
}
 
const scratchCartesian = new Cartesian3();
const scratchSpherical = new Spherical();
const scratchCartographic = new Cartographic();
const scratchTimeInterval = new TimeInterval();
const scratchQuaternion = new Quaternion();
 
function unwrapColorInterval(czmlInterval) {
  let rgbaf = czmlInterval.rgbaf;
  if (defined(rgbaf)) {
    return rgbaf;
  }
 
  const rgba = czmlInterval.rgba;
  if (!defined(rgba)) {
    return undefined;
  }
 
  const length = rgba.length;
  if (length === Color.packedLength) {
    return [
      Color.byteToFloat(rgba[0]),
      Color.byteToFloat(rgba[1]),
      Color.byteToFloat(rgba[2]),
      Color.byteToFloat(rgba[3]),
    ];
  }
 
  rgbaf = new Array(length);
  for (let i = 0; i < length; i += 5) {
    rgbaf[i] = rgba[i];
    rgbaf[i + 1] = Color.byteToFloat(rgba[i + 1]);
    rgbaf[i + 2] = Color.byteToFloat(rgba[i + 2]);
    rgbaf[i + 3] = Color.byteToFloat(rgba[i + 3]);
    rgbaf[i + 4] = Color.byteToFloat(rgba[i + 4]);
  }
  return rgbaf;
}
 
function unwrapUriInterval(czmlInterval, sourceUri) {
  const uri = czmlInterval.uri ?? czmlInterval;
  if (defined(sourceUri)) {
    return sourceUri.getDerivedResource({
      url: uri,
    });
  }
 
  return Resource.createIfNeeded(uri);
}
 
function unwrapRectangleInterval(czmlInterval) {
  let wsen = czmlInterval.wsen;
  if (defined(wsen)) {
    return wsen;
  }
 
  const wsenDegrees = czmlInterval.wsenDegrees;
  if (!defined(wsenDegrees)) {
    return undefined;
  }
 
  const length = wsenDegrees.length;
  if (length === Rectangle.packedLength) {
    return [
      CesiumMath.toRadians(wsenDegrees[0]),
      CesiumMath.toRadians(wsenDegrees[1]),
      CesiumMath.toRadians(wsenDegrees[2]),
      CesiumMath.toRadians(wsenDegrees[3]),
    ];
  }
 
  wsen = new Array(length);
  for (let i = 0; i < length; i += 5) {
    wsen[i] = wsenDegrees[i];
    wsen[i + 1] = CesiumMath.toRadians(wsenDegrees[i + 1]);
    wsen[i + 2] = CesiumMath.toRadians(wsenDegrees[i + 2]);
    wsen[i + 3] = CesiumMath.toRadians(wsenDegrees[i + 3]);
    wsen[i + 4] = CesiumMath.toRadians(wsenDegrees[i + 4]);
  }
  return wsen;
}
 
function convertUnitSphericalToCartesian(unitSpherical) {
  const length = unitSpherical.length;
  scratchSpherical.magnitude = 1.0;
  if (length === 2) {
    scratchSpherical.clock = unitSpherical[0];
    scratchSpherical.cone = unitSpherical[1];
    Cartesian3.fromSpherical(scratchSpherical, scratchCartesian);
    return [scratchCartesian.x, scratchCartesian.y, scratchCartesian.z];
  }
 
  const result = new Array((length / 3) * 4);
  for (let i = 0, j = 0; i < length; i += 3, j += 4) {
    result[j] = unitSpherical[i];
 
    scratchSpherical.clock = unitSpherical[i + 1];
    scratchSpherical.cone = unitSpherical[i + 2];
    Cartesian3.fromSpherical(scratchSpherical, scratchCartesian);
 
    result[j + 1] = scratchCartesian.x;
    result[j + 2] = scratchCartesian.y;
    result[j + 3] = scratchCartesian.z;
  }
  return result;
}
 
function convertSphericalToCartesian(spherical) {
  const length = spherical.length;
  if (length === 3) {
    scratchSpherical.clock = spherical[0];
    scratchSpherical.cone = spherical[1];
    scratchSpherical.magnitude = spherical[2];
    Cartesian3.fromSpherical(scratchSpherical, scratchCartesian);
    return [scratchCartesian.x, scratchCartesian.y, scratchCartesian.z];
  }
 
  const result = new Array(length);
  for (let i = 0; i < length; i += 4) {
    result[i] = spherical[i];
 
    scratchSpherical.clock = spherical[i + 1];
    scratchSpherical.cone = spherical[i + 2];
    scratchSpherical.magnitude = spherical[i + 3];
    Cartesian3.fromSpherical(scratchSpherical, scratchCartesian);
 
    result[i + 1] = scratchCartesian.x;
    result[i + 2] = scratchCartesian.y;
    result[i + 3] = scratchCartesian.z;
  }
  return result;
}
 
function convertCartographicRadiansToCartesian(cartographicRadians) {
  const length = cartographicRadians.length;
  if (length === 3) {
    scratchCartographic.longitude = cartographicRadians[0];
    scratchCartographic.latitude = cartographicRadians[1];
    scratchCartographic.height = cartographicRadians[2];
    Ellipsoid.default.cartographicToCartesian(
      scratchCartographic,
      scratchCartesian,
    );
    return [scratchCartesian.x, scratchCartesian.y, scratchCartesian.z];
  }
 
  const result = new Array(length);
  for (let i = 0; i < length; i += 4) {
    result[i] = cartographicRadians[i];
 
    scratchCartographic.longitude = cartographicRadians[i + 1];
    scratchCartographic.latitude = cartographicRadians[i + 2];
    scratchCartographic.height = cartographicRadians[i + 3];
    Ellipsoid.default.cartographicToCartesian(
      scratchCartographic,
      scratchCartesian,
    );
 
    result[i + 1] = scratchCartesian.x;
    result[i + 2] = scratchCartesian.y;
    result[i + 3] = scratchCartesian.z;
  }
  return result;
}
 
function convertCartographicDegreesToCartesian(cartographicDegrees) {
  const length = cartographicDegrees.length;
  if (length === 3) {
    scratchCartographic.longitude = CesiumMath.toRadians(
      cartographicDegrees[0],
    );
    scratchCartographic.latitude = CesiumMath.toRadians(cartographicDegrees[1]);
    scratchCartographic.height = cartographicDegrees[2];
    Ellipsoid.default.cartographicToCartesian(
      scratchCartographic,
      scratchCartesian,
    );
    return [scratchCartesian.x, scratchCartesian.y, scratchCartesian.z];
  }
 
  const result = new Array(length);
  for (let i = 0; i < length; i += 4) {
    result[i] = cartographicDegrees[i];
 
    scratchCartographic.longitude = CesiumMath.toRadians(
      cartographicDegrees[i + 1],
    );
    scratchCartographic.latitude = CesiumMath.toRadians(
      cartographicDegrees[i + 2],
    );
    scratchCartographic.height = cartographicDegrees[i + 3];
    Ellipsoid.default.cartographicToCartesian(
      scratchCartographic,
      scratchCartesian,
    );
 
    result[i + 1] = scratchCartesian.x;
    result[i + 2] = scratchCartesian.y;
    result[i + 3] = scratchCartesian.z;
  }
  return result;
}
 
function unwrapCartesianInterval(czmlInterval) {
  const cartesian = czmlInterval.cartesian;
  if (defined(cartesian)) {
    return cartesian;
  }
 
  const cartesianVelocity = czmlInterval.cartesianVelocity;
  if (defined(cartesianVelocity)) {
    return cartesianVelocity;
  }
 
  const unitCartesian = czmlInterval.unitCartesian;
  if (defined(unitCartesian)) {
    return unitCartesian;
  }
 
  const unitSpherical = czmlInterval.unitSpherical;
  if (defined(unitSpherical)) {
    return convertUnitSphericalToCartesian(unitSpherical);
  }
 
  const spherical = czmlInterval.spherical;
  if (defined(spherical)) {
    return convertSphericalToCartesian(spherical);
  }
 
  const cartographicRadians = czmlInterval.cartographicRadians;
  if (defined(cartographicRadians)) {
    return convertCartographicRadiansToCartesian(cartographicRadians);
  }
 
  const cartographicDegrees = czmlInterval.cartographicDegrees;
  Eif (defined(cartographicDegrees)) {
    return convertCartographicDegreesToCartesian(cartographicDegrees);
  }
 
  throw new RuntimeError(
    `${JSON.stringify(czmlInterval)} is not a valid CZML interval.`,
  );
}
 
function normalizePackedCartesianArray(array, startingIndex) {
  Cartesian3.unpack(array, startingIndex, scratchCartesian);
  Cartesian3.normalize(scratchCartesian, scratchCartesian);
  Cartesian3.pack(scratchCartesian, array, startingIndex);
}
 
function unwrapUnitCartesianInterval(czmlInterval) {
  const cartesian = unwrapCartesianInterval(czmlInterval);
  if (cartesian.length === 3) {
    normalizePackedCartesianArray(cartesian, 0);
    return cartesian;
  }
 
  for (let i = 1; i < cartesian.length; i += 4) {
    normalizePackedCartesianArray(cartesian, i);
  }
 
  return cartesian;
}
 
function normalizePackedQuaternionArray(array, startingIndex) {
  Quaternion.unpack(array, startingIndex, scratchQuaternion);
  Quaternion.normalize(scratchQuaternion, scratchQuaternion);
  Quaternion.pack(scratchQuaternion, array, startingIndex);
}
 
function unwrapQuaternionInterval(czmlInterval) {
  const unitQuaternion = czmlInterval.unitQuaternion;
  Eif (defined(unitQuaternion)) {
    if (unitQuaternion.length === 4) {
      normalizePackedQuaternionArray(unitQuaternion, 0);
      return unitQuaternion;
    }
 
    for (let i = 1; i < unitQuaternion.length; i += 5) {
      normalizePackedQuaternionArray(unitQuaternion, i);
    }
  }
  return unitQuaternion;
}
 
function getPropertyType(czmlInterval) {
  // The associations in this function need to be kept in sync with the
  // associations in unwrapInterval.
 
  // Intentionally omitted due to conficts in CZML property names:
  // * Image (conflicts with Uri)
  // * Rotation (conflicts with Number)
  //
  // cartesianVelocity is also omitted due to incomplete support for
  // derivative information in CZML properties.
  // (Currently cartesianVelocity is hacked directly into the position processing code)
  if (typeof czmlInterval === "boolean") {
    return Boolean;
  } else if (typeof czmlInterval === "number") {
    return Number;
  } else if (typeof czmlInterval === "string") {
    return String;
  } else if (czmlInterval.hasOwnProperty("array")) {
    return Array;
  } else if (czmlInterval.hasOwnProperty("boolean")) {
    return Boolean;
  } else if (czmlInterval.hasOwnProperty("boundingRectangle")) {
    return BoundingRectangle;
  } else if (czmlInterval.hasOwnProperty("cartesian2")) {
    return Cartesian2;
  } else if (
    czmlInterval.hasOwnProperty("cartesian") ||
    czmlInterval.hasOwnProperty("spherical") ||
    czmlInterval.hasOwnProperty("cartographicRadians") ||
    czmlInterval.hasOwnProperty("cartographicDegrees")
  ) {
    return Cartesian3;
  } else if (
    czmlInterval.hasOwnProperty("unitCartesian") ||
    czmlInterval.hasOwnProperty("unitSpherical")
  ) {
    return UnitCartesian3;
  } else if (
    czmlInterval.hasOwnProperty("rgba") ||
    czmlInterval.hasOwnProperty("rgbaf")
  ) {
    return Color;
  } else Iif (czmlInterval.hasOwnProperty("arcType")) {
    return ArcType;
  } else Iif (czmlInterval.hasOwnProperty("classificationType")) {
    return ClassificationType;
  } else if (czmlInterval.hasOwnProperty("colorBlendMode")) {
    return ColorBlendMode;
  } else if (czmlInterval.hasOwnProperty("cornerType")) {
    return CornerType;
  } else if (czmlInterval.hasOwnProperty("heightReference")) {
    return HeightReference;
  } else if (czmlInterval.hasOwnProperty("horizontalOrigin")) {
    return HorizontalOrigin;
  } else if (czmlInterval.hasOwnProperty("date")) {
    return JulianDate;
  } else if (czmlInterval.hasOwnProperty("labelStyle")) {
    return LabelStyle;
  } else if (czmlInterval.hasOwnProperty("number")) {
    return Number;
  } else if (czmlInterval.hasOwnProperty("nearFarScalar")) {
    return NearFarScalar;
  } else Iif (czmlInterval.hasOwnProperty("distanceDisplayCondition")) {
    return DistanceDisplayCondition;
  } else if (
    czmlInterval.hasOwnProperty("object") ||
    czmlInterval.hasOwnProperty("value")
  ) {
    return Object;
  } else if (czmlInterval.hasOwnProperty("unitQuaternion")) {
    return Quaternion;
  } else if (czmlInterval.hasOwnProperty("shadowMode")) {
    return ShadowMode;
  } else if (czmlInterval.hasOwnProperty("string")) {
    return String;
  } else if (czmlInterval.hasOwnProperty("stripeOrientation")) {
    return StripeOrientation;
  } else if (
    czmlInterval.hasOwnProperty("wsen") ||
    czmlInterval.hasOwnProperty("wsenDegrees")
  ) {
    return Rectangle;
  } else if (czmlInterval.hasOwnProperty("uri")) {
    return Uri;
  } else if (czmlInterval.hasOwnProperty("verticalOrigin")) {
    return VerticalOrigin;
  }
  // fallback case
  return Object;
}
 
function unwrapInterval(type, czmlInterval, sourceUri) {
  // The associations in this function need to be kept in sync with the
  // associations in getPropertyType
  switch (type) {
    case ArcType:
      return ArcType[czmlInterval.arcType ?? czmlInterval];
    case Array:
      return czmlInterval.array;
    case Boolean:
      return czmlInterval["boolean"] ?? czmlInterval;
    case BoundingRectangle:
      return czmlInterval.boundingRectangle;
    case Cartesian2:
      return czmlInterval.cartesian2;
    case Cartesian3:
      return unwrapCartesianInterval(czmlInterval);
    case UnitCartesian3:
      return unwrapUnitCartesianInterval(czmlInterval);
    case Color:
      return unwrapColorInterval(czmlInterval);
    case ClassificationType:
      return ClassificationType[
        czmlInterval.classificationType ?? czmlInterval
      ];
    case ColorBlendMode:
      return ColorBlendMode[czmlInterval.colorBlendMode ?? czmlInterval];
    case CornerType:
      return CornerType[czmlInterval.cornerType ?? czmlInterval];
    case HeightReference:
      return HeightReference[czmlInterval.heightReference ?? czmlInterval];
    case HorizontalOrigin:
      return HorizontalOrigin[czmlInterval.horizontalOrigin ?? czmlInterval];
    case Image:
      return unwrapUriInterval(czmlInterval, sourceUri);
    case JulianDate:
      return JulianDate.fromIso8601(czmlInterval.date ?? czmlInterval);
    case LabelStyle:
      return LabelStyle[czmlInterval.labelStyle ?? czmlInterval];
    case Number:
      return czmlInterval.number ?? czmlInterval;
    case NearFarScalar:
      return czmlInterval.nearFarScalar;
    case DistanceDisplayCondition:
      return czmlInterval.distanceDisplayCondition;
    case Object:
      return czmlInterval.object ?? czmlInterval.value ?? czmlInterval;
    case Quaternion:
      return unwrapQuaternionInterval(czmlInterval);
    case Rotation:
      return czmlInterval.number ?? czmlInterval;
    case SensorVolumePortionToDisplay:
      return SensorVolumePortionToDisplay[
        czmlInterval.portionToDisplay ?? czmlInterval
      ];
    case ShadowMode:
      return ShadowMode[
        czmlInterval.shadowMode ?? czmlInterval.shadows ?? czmlInterval
      ];
    case String:
      return czmlInterval.string ?? czmlInterval;
    case StripeOrientation:
      return StripeOrientation[czmlInterval.stripeOrientation ?? czmlInterval];
    case Rectangle:
      return unwrapRectangleInterval(czmlInterval);
    case Uri:
      return unwrapUriInterval(czmlInterval, sourceUri);
    case VerticalOrigin:
      return VerticalOrigin[czmlInterval.verticalOrigin ?? czmlInterval];
    default:
      throw new RuntimeError(`Unknown CzmlDataSource interval type: ${type}`);
  }
}
 
const interpolators = {
  HERMITE: HermitePolynomialApproximation,
  LAGRANGE: LagrangePolynomialApproximation,
  LINEAR: LinearApproximation,
};
 
function updateInterpolationSettings(packetData, property) {
  const interpolationAlgorithm = packetData.interpolationAlgorithm;
  const interpolationDegree = packetData.interpolationDegree;
  if (defined(interpolationAlgorithm) || defined(interpolationDegree)) {
    property.setInterpolationOptions({
      interpolationAlgorithm: interpolators[interpolationAlgorithm],
      interpolationDegree: interpolationDegree,
    });
  }
 
  const forwardExtrapolationType = packetData.forwardExtrapolationType;
  if (defined(forwardExtrapolationType)) {
    property.forwardExtrapolationType =
      ExtrapolationType[forwardExtrapolationType];
  }
 
  const forwardExtrapolationDuration = packetData.forwardExtrapolationDuration;
  if (defined(forwardExtrapolationDuration)) {
    property.forwardExtrapolationDuration = forwardExtrapolationDuration;
  }
 
  const backwardExtrapolationType = packetData.backwardExtrapolationType;
  if (defined(backwardExtrapolationType)) {
    property.backwardExtrapolationType =
      ExtrapolationType[backwardExtrapolationType];
  }
 
  const backwardExtrapolationDuration =
    packetData.backwardExtrapolationDuration;
  if (defined(backwardExtrapolationDuration)) {
    property.backwardExtrapolationDuration = backwardExtrapolationDuration;
  }
}
 
const iso8601Scratch = {
  iso8601: undefined,
};
 
function intervalFromString(intervalString) {
  if (!defined(intervalString)) {
    return undefined;
  }
  iso8601Scratch.iso8601 = intervalString;
  return TimeInterval.fromIso8601(iso8601Scratch);
}
 
function wrapPropertyInInfiniteInterval(property) {
  const interval = Iso8601.MAXIMUM_INTERVAL.clone();
  interval.data = property;
  return interval;
}
 
function convertPropertyToComposite(property) {
  // Create the composite and add the old property, wrapped in an infinite interval.
  const composite = new CompositeProperty();
  composite.intervals.addInterval(wrapPropertyInInfiniteInterval(property));
  return composite;
}
 
function convertPositionPropertyToComposite(property) {
  // Create the composite and add the old property, wrapped in an infinite interval.
  const composite = new CompositePositionProperty(property.referenceFrame);
  composite.intervals.addInterval(wrapPropertyInInfiniteInterval(property));
  return composite;
}
 
function processProperty(
  type,
  object,
  propertyName,
  packetData,
  constrainedInterval,
  sourceUri,
  entityCollection,
) {
  let combinedInterval = intervalFromString(packetData.interval);
  if (defined(constrainedInterval)) {
    if (defined(combinedInterval)) {
      combinedInterval = TimeInterval.intersect(
        combinedInterval,
        constrainedInterval,
        scratchTimeInterval,
      );
    } else {
      combinedInterval = constrainedInterval;
    }
  }
 
  let packedLength;
  let unwrappedInterval;
  let unwrappedIntervalLength;
 
  // CZML properties can be defined in many ways.  Most ways represent a structure for
  // encoding a single value (number, string, cartesian, etc.)  Regardless of the value type,
  // if it encodes a single value it will get loaded into a ConstantProperty eventually.
  // Alternatively, there are ways of defining a property that require specialized
  // client-side representation. Currently, these are ReferenceProperty,
  // and client-side velocity computation properties such as VelocityVectorProperty.
  const isValue =
    !defined(packetData.reference) && !defined(packetData.velocityReference);
  const hasInterval =
    defined(combinedInterval) &&
    !combinedInterval.equals(Iso8601.MAXIMUM_INTERVAL);
 
  if (packetData.delete === true) {
    // If deleting this property for all time, we can simply set to undefined and return.
    if (!hasInterval) {
      object[propertyName] = undefined;
      return;
    }
 
    // Deleting depends on the type of property we have.
    return removePropertyData(object[propertyName], combinedInterval);
  }
 
  let isSampled = false;
 
  if (isValue) {
    unwrappedInterval = unwrapInterval(type, packetData, sourceUri);
    if (!defined(unwrappedInterval)) {
      // not a known value type, bail
      return;
    }
    packedLength = type.packedLength ?? 1;
    unwrappedIntervalLength = unwrappedInterval.length ?? 1;
    isSampled =
      !defined(packetData.array) &&
      typeof unwrappedInterval !== "string" &&
      unwrappedIntervalLength > packedLength &&
      type !== Object;
  }
 
  // Rotation is a special case because it represents a native type (Number)
  // and therefore does not need to be unpacked when loaded as a constant value.
  const needsUnpacking = typeof type.unpack === "function" && type !== Rotation;
 
  // Any time a constant value is assigned, it completely blows away anything else.
  if (!isSampled && !hasInterval) {
    if (isValue) {
      object[propertyName] = new ConstantProperty(
        needsUnpacking ? type.unpack(unwrappedInterval, 0) : unwrappedInterval,
      );
    } else {
      object[propertyName] = createSpecializedProperty(
        type,
        entityCollection,
        packetData,
      );
    }
    return;
  }
 
  let property = object[propertyName];
 
  let epoch;
  const packetEpoch = packetData.epoch;
  if (defined(packetEpoch)) {
    epoch = JulianDate.fromIso8601(packetEpoch);
  }
 
  // Without an interval, any sampled value is infinite, meaning it completely
  // replaces any non-sampled property that may exist.
  if (isSampled && !hasInterval) {
    Eif (!(property instanceof SampledProperty)) {
      object[propertyName] = property = new SampledProperty(type);
    }
    property.addSamplesPackedArray(unwrappedInterval, epoch);
    updateInterpolationSettings(packetData, property);
    return;
  }
 
  let interval;
 
  // A constant value with an interval is normally part of a TimeIntervalCollection,
  // However, if the current property is not a time-interval collection, we need
  // to turn it into a Composite, preserving the old data with the new interval.
  if (!isSampled && hasInterval) {
    // Create a new interval for the constant value.
    combinedInterval = combinedInterval.clone();
    if (isValue) {
      combinedInterval.data = needsUnpacking
        ? type.unpack(unwrappedInterval, 0)
        : unwrappedInterval;
    } else {
      combinedInterval.data = createSpecializedProperty(
        type,
        entityCollection,
        packetData,
      );
    }
 
    // If no property exists, simply use a new interval collection
    if (!defined(property)) {
      object[propertyName] = property = isValue
        ? new TimeIntervalCollectionProperty()
        : new CompositeProperty();
    }
 
    if (isValue && property instanceof TimeIntervalCollectionProperty) {
      // If we created a collection, or it already was one, use it.
      property.intervals.addInterval(combinedInterval);
    } else if (property instanceof CompositeProperty) {
      // If the collection was already a CompositeProperty, use it.
      if (isValue) {
        combinedInterval.data = new ConstantProperty(combinedInterval.data);
      }
      property.intervals.addInterval(combinedInterval);
    } else {
      // Otherwise, create a CompositeProperty but preserve the existing data.
      object[propertyName] = property = convertPropertyToComposite(property);
 
      // Change the new data to a ConstantProperty and add it.
      if (isValue) {
        combinedInterval.data = new ConstantProperty(combinedInterval.data);
      }
      property.intervals.addInterval(combinedInterval);
    }
 
    return;
  }
 
  // isSampled && hasInterval
  if (!defined(property)) {
    object[propertyName] = property = new CompositeProperty();
  }
 
  // Create a CompositeProperty but preserve the existing data.
  if (!(property instanceof CompositeProperty)) {
    object[propertyName] = property = convertPropertyToComposite(property);
  }
 
  // Check if the interval already exists in the composite.
  const intervals = property.intervals;
  interval = intervals.findInterval(combinedInterval);
  Eif (!defined(interval) || !(interval.data instanceof SampledProperty)) {
    // If not, create a SampledProperty for it.
    interval = combinedInterval.clone();
    interval.data = new SampledProperty(type);
    intervals.addInterval(interval);
  }
  interval.data.addSamplesPackedArray(unwrappedInterval, epoch);
  updateInterpolationSettings(packetData, interval.data);
}
 
function removePropertyData(property, interval) {
  if (property instanceof SampledProperty) {
    property.removeSamples(interval);
    return;
  } else if (property instanceof TimeIntervalCollectionProperty) {
    property.intervals.removeInterval(interval);
    return;
  } else if (property instanceof CompositeProperty) {
    const intervals = property.intervals;
    for (let i = 0; i < intervals.length; ++i) {
      const intersection = TimeInterval.intersect(
        intervals.get(i),
        interval,
        scratchTimeInterval,
      );
      Eif (!intersection.isEmpty) {
        // remove data from the contained properties
        removePropertyData(intersection.data, interval);
      }
    }
    // remove the intervals from the composite
    intervals.removeInterval(interval);
    return;
  }
}
 
function processPacketData(
  type,
  object,
  propertyName,
  packetData,
  interval,
  sourceUri,
  entityCollection,
) {
  if (!defined(packetData)) {
    return;
  }
 
  if (Array.isArray(packetData)) {
    for (let i = 0, len = packetData.length; i < len; ++i) {
      processProperty(
        type,
        object,
        propertyName,
        packetData[i],
        interval,
        sourceUri,
        entityCollection,
      );
    }
  } else {
    processProperty(
      type,
      object,
      propertyName,
      packetData,
      interval,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processPositionProperty(
  object,
  propertyName,
  packetData,
  constrainedInterval,
  sourceUri,
  entityCollection,
) {
  let combinedInterval = intervalFromString(packetData.interval);
  Iif (defined(constrainedInterval)) {
    if (defined(combinedInterval)) {
      combinedInterval = TimeInterval.intersect(
        combinedInterval,
        constrainedInterval,
        scratchTimeInterval,
      );
    } else {
      combinedInterval = constrainedInterval;
    }
  }
 
  const numberOfDerivatives = defined(packetData.cartesianVelocity) ? 1 : 0;
  const packedLength = Cartesian3.packedLength * (numberOfDerivatives + 1);
  let unwrappedInterval;
  let unwrappedIntervalLength;
  const isValue = !defined(packetData.reference);
  const hasInterval =
    defined(combinedInterval) &&
    !combinedInterval.equals(Iso8601.MAXIMUM_INTERVAL);
 
  if (packetData.delete === true) {
    // If deleting this property for all time, we can simply set to undefined and return.
    if (!hasInterval) {
      object[propertyName] = undefined;
      return;
    }
 
    // Deleting depends on the type of property we have.
    return removePositionPropertyData(object[propertyName], combinedInterval);
  }
 
  let referenceFrame;
  let isSampled = false;
 
  if (isValue) {
    if (defined(packetData.referenceFrame)) {
      referenceFrame = ReferenceFrame[packetData.referenceFrame];
    }
    referenceFrame = referenceFrame ?? ReferenceFrame.FIXED;
    unwrappedInterval = unwrapCartesianInterval(packetData);
    unwrappedIntervalLength = unwrappedInterval.length ?? 1;
    isSampled = unwrappedIntervalLength > packedLength;
  }
 
  // Any time a constant value is assigned, it completely blows away anything else.
  if (!isSampled && !hasInterval) {
    if (isValue) {
      object[propertyName] = new ConstantPositionProperty(
        Cartesian3.unpack(unwrappedInterval),
        referenceFrame,
      );
    } else {
      object[propertyName] = createReferenceProperty(
        entityCollection,
        packetData.reference,
      );
    }
    return;
  }
 
  let property = object[propertyName];
 
  let epoch;
  const packetEpoch = packetData.epoch;
  if (defined(packetEpoch)) {
    epoch = JulianDate.fromIso8601(packetEpoch);
  }
 
  // Without an interval, any sampled value is infinite, meaning it completely
  // replaces any non-sampled property that may exist.
  if (isSampled && !hasInterval) {
    Eif (
      !(property instanceof SampledPositionProperty) ||
      (defined(referenceFrame) && property.referenceFrame !== referenceFrame)
    ) {
      object[propertyName] = property = new SampledPositionProperty(
        referenceFrame,
        numberOfDerivatives,
      );
    }
    property.addSamplesPackedArray(unwrappedInterval, epoch);
    updateInterpolationSettings(packetData, property);
    return;
  }
 
  let interval;
 
  // A constant value with an interval is normally part of a TimeIntervalCollection,
  // However, if the current property is not a time-interval collection, we need
  // to turn it into a Composite, preserving the old data with the new interval.
  if (!isSampled && hasInterval) {
    // Create a new interval for the constant value.
    combinedInterval = combinedInterval.clone();
    if (isValue) {
      combinedInterval.data = Cartesian3.unpack(unwrappedInterval);
    } else {
      combinedInterval.data = createReferenceProperty(
        entityCollection,
        packetData.reference,
      );
    }
 
    // If no property exists, simply use a new interval collection
    if (!defined(property)) {
      if (isValue) {
        property = new TimeIntervalCollectionPositionProperty(referenceFrame);
      } else {
        property = new CompositePositionProperty(referenceFrame);
      }
      object[propertyName] = property;
    }
 
    if (
      isValue &&
      property instanceof TimeIntervalCollectionPositionProperty &&
      defined(referenceFrame) &&
      property.referenceFrame === referenceFrame
    ) {
      // If we create a collection, or it already existed, use it.
      property.intervals.addInterval(combinedInterval);
    } else if (property instanceof CompositePositionProperty) {
      // If the collection was already a CompositePositionProperty, use it.
      if (isValue) {
        combinedInterval.data = new ConstantPositionProperty(
          combinedInterval.data,
          referenceFrame,
        );
      }
      property.intervals.addInterval(combinedInterval);
    } else {
      // Otherwise, create a CompositePositionProperty but preserve the existing data.
      object[propertyName] = property =
        convertPositionPropertyToComposite(property);
 
      // Change the new data to a ConstantPositionProperty and add it.
      Eif (isValue) {
        combinedInterval.data = new ConstantPositionProperty(
          combinedInterval.data,
          referenceFrame,
        );
      }
      property.intervals.addInterval(combinedInterval);
    }
 
    return;
  }
 
  // isSampled && hasInterval
  if (!defined(property)) {
    object[propertyName] = property = new CompositePositionProperty(
      referenceFrame,
    );
  } else if (!(property instanceof CompositePositionProperty)) {
    // Create a CompositeProperty but preserve the existing data.
    object[propertyName] = property =
      convertPositionPropertyToComposite(property);
  }
 
  // Check if the interval already exists in the composite.
  const intervals = property.intervals;
  interval = intervals.findInterval(combinedInterval);
  Eif (
    !defined(interval) ||
    !(interval.data instanceof SampledPositionProperty) ||
    (defined(referenceFrame) && interval.data.referenceFrame !== referenceFrame)
  ) {
    // If not, create a SampledPositionProperty for it.
    interval = combinedInterval.clone();
    interval.data = new SampledPositionProperty(
      referenceFrame,
      numberOfDerivatives,
    );
    intervals.addInterval(interval);
  }
  interval.data.addSamplesPackedArray(unwrappedInterval, epoch);
  updateInterpolationSettings(packetData, interval.data);
}
 
function removePositionPropertyData(property, interval) {
  if (property instanceof SampledPositionProperty) {
    property.removeSamples(interval);
    return;
  } else if (property instanceof TimeIntervalCollectionPositionProperty) {
    property.intervals.removeInterval(interval);
    return;
  } else if (property instanceof CompositePositionProperty) {
    const intervals = property.intervals;
    for (let i = 0; i < intervals.length; ++i) {
      const intersection = TimeInterval.intersect(
        intervals.get(i),
        interval,
        scratchTimeInterval,
      );
      Eif (!intersection.isEmpty) {
        // remove data from the contained properties
        removePositionPropertyData(intersection.data, interval);
      }
    }
    // remove the intervals from the composite
    intervals.removeInterval(interval);
    return;
  }
}
 
function processPositionPacketData(
  object,
  propertyName,
  packetData,
  interval,
  sourceUri,
  entityCollection,
) {
  Iif (!defined(packetData)) {
    return;
  }
 
  if (Array.isArray(packetData)) {
    for (let i = 0, len = packetData.length; i < len; ++i) {
      processPositionProperty(
        object,
        propertyName,
        packetData[i],
        interval,
        sourceUri,
        entityCollection,
      );
    }
  } else {
    processPositionProperty(
      object,
      propertyName,
      packetData,
      interval,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processShapePacketData(
  object,
  propertyName,
  packetData,
  entityCollection,
) {
  Iif (defined(packetData.references)) {
    processReferencesArrayPacketData(
      object,
      propertyName,
      packetData.references,
      packetData.interval,
      entityCollection,
      PropertyArray,
      CompositeProperty,
    );
  } else {
    if (defined(packetData.cartesian2)) {
      packetData.array = Cartesian2.unpackArray(packetData.cartesian2);
    } else Eif (defined(packetData.cartesian)) {
      // for backwards compatibility, also accept `cartesian`
      packetData.array = Cartesian2.unpackArray(packetData.cartesian);
    }
 
    Eif (defined(packetData.array)) {
      processPacketData(
        Array,
        object,
        propertyName,
        packetData,
        undefined,
        undefined,
        entityCollection,
      );
    }
  }
}
 
function processMaterialProperty(
  object,
  propertyName,
  packetData,
  constrainedInterval,
  sourceUri,
  entityCollection,
) {
  let combinedInterval = intervalFromString(packetData.interval);
  if (defined(constrainedInterval)) {
    if (defined(combinedInterval)) {
      combinedInterval = TimeInterval.intersect(
        combinedInterval,
        constrainedInterval,
        scratchTimeInterval,
      );
    } else {
      combinedInterval = constrainedInterval;
    }
  }
 
  let property = object[propertyName];
  let existingMaterial;
  let existingInterval;
 
  if (defined(combinedInterval)) {
    if (!(property instanceof CompositeMaterialProperty)) {
      property = new CompositeMaterialProperty();
      object[propertyName] = property;
    }
    //See if we already have data at that interval.
    const thisIntervals = property.intervals;
    existingInterval = thisIntervals.findInterval({
      start: combinedInterval.start,
      stop: combinedInterval.stop,
    });
    if (defined(existingInterval)) {
      //We have an interval, but we need to make sure the
      //new data is the same type of material as the old data.
      existingMaterial = existingInterval.data;
    } else {
      //If not, create it.
      existingInterval = combinedInterval.clone();
      thisIntervals.addInterval(existingInterval);
    }
  } else {
    existingMaterial = property;
  }
 
  let materialData;
  if (defined(packetData.solidColor)) {
    if (!(existingMaterial instanceof ColorMaterialProperty)) {
      existingMaterial = new ColorMaterialProperty();
    }
    materialData = packetData.solidColor;
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      undefined,
      entityCollection,
    );
  } else if (defined(packetData.grid)) {
    Eif (!(existingMaterial instanceof GridMaterialProperty)) {
      existingMaterial = new GridMaterialProperty();
    }
    materialData = packetData.grid;
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "cellAlpha",
      materialData.cellAlpha,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Cartesian2,
      existingMaterial,
      "lineCount",
      materialData.lineCount,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Cartesian2,
      existingMaterial,
      "lineThickness",
      materialData.lineThickness,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Cartesian2,
      existingMaterial,
      "lineOffset",
      materialData.lineOffset,
      undefined,
      sourceUri,
      entityCollection,
    );
  } else if (defined(packetData.image)) {
    Eif (!(existingMaterial instanceof ImageMaterialProperty)) {
      existingMaterial = new ImageMaterialProperty();
    }
    materialData = packetData.image;
    processPacketData(
      Image,
      existingMaterial,
      "image",
      materialData.image,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Cartesian2,
      existingMaterial,
      "repeat",
      materialData.repeat,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Boolean,
      existingMaterial,
      "transparent",
      materialData.transparent,
      undefined,
      sourceUri,
      entityCollection,
    );
  } else if (defined(packetData.stripe)) {
    Eif (!(existingMaterial instanceof StripeMaterialProperty)) {
      existingMaterial = new StripeMaterialProperty();
    }
    materialData = packetData.stripe;
    processPacketData(
      StripeOrientation,
      existingMaterial,
      "orientation",
      materialData.orientation,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Color,
      existingMaterial,
      "evenColor",
      materialData.evenColor,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Color,
      existingMaterial,
      "oddColor",
      materialData.oddColor,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "offset",
      materialData.offset,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "repeat",
      materialData.repeat,
      undefined,
      sourceUri,
      entityCollection,
    );
  } else if (defined(packetData.polylineOutline)) {
    Eif (!(existingMaterial instanceof PolylineOutlineMaterialProperty)) {
      existingMaterial = new PolylineOutlineMaterialProperty();
    }
    materialData = packetData.polylineOutline;
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Color,
      existingMaterial,
      "outlineColor",
      materialData.outlineColor,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "outlineWidth",
      materialData.outlineWidth,
      undefined,
      sourceUri,
      entityCollection,
    );
  } else if (defined(packetData.polylineGlow)) {
    Eif (!(existingMaterial instanceof PolylineGlowMaterialProperty)) {
      existingMaterial = new PolylineGlowMaterialProperty();
    }
    materialData = packetData.polylineGlow;
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "glowPower",
      materialData.glowPower,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "taperPower",
      materialData.taperPower,
      undefined,
      sourceUri,
      entityCollection,
    );
  } else if (defined(packetData.polylineArrow)) {
    Eif (!(existingMaterial instanceof PolylineArrowMaterialProperty)) {
      existingMaterial = new PolylineArrowMaterialProperty();
    }
    materialData = packetData.polylineArrow;
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      undefined,
      entityCollection,
    );
  } else if (defined(packetData.polylineDash)) {
    Eif (!(existingMaterial instanceof PolylineDashMaterialProperty)) {
      existingMaterial = new PolylineDashMaterialProperty();
    }
    materialData = packetData.polylineDash;
    processPacketData(
      Color,
      existingMaterial,
      "color",
      materialData.color,
      undefined,
      undefined,
      entityCollection,
    );
    processPacketData(
      Color,
      existingMaterial,
      "gapColor",
      materialData.gapColor,
      undefined,
      undefined,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "dashLength",
      materialData.dashLength,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Number,
      existingMaterial,
      "dashPattern",
      materialData.dashPattern,
      undefined,
      sourceUri,
      entityCollection,
    );
  } else Eif (defined(packetData.checkerboard)) {
    Eif (!(existingMaterial instanceof CheckerboardMaterialProperty)) {
      existingMaterial = new CheckerboardMaterialProperty();
    }
    materialData = packetData.checkerboard;
    processPacketData(
      Color,
      existingMaterial,
      "evenColor",
      materialData.evenColor,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Color,
      existingMaterial,
      "oddColor",
      materialData.oddColor,
      undefined,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Cartesian2,
      existingMaterial,
      "repeat",
      materialData.repeat,
      undefined,
      sourceUri,
      entityCollection,
    );
  }
 
  if (defined(existingInterval)) {
    existingInterval.data = existingMaterial;
  } else {
    object[propertyName] = existingMaterial;
  }
}
 
function processMaterialPacketData(
  object,
  propertyName,
  packetData,
  interval,
  sourceUri,
  entityCollection,
) {
  if (!defined(packetData)) {
    return;
  }
 
  if (Array.isArray(packetData)) {
    for (let i = 0, len = packetData.length; i < len; ++i) {
      processMaterialProperty(
        object,
        propertyName,
        packetData[i],
        interval,
        sourceUri,
        entityCollection,
      );
    }
  } else {
    processMaterialProperty(
      object,
      propertyName,
      packetData,
      interval,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processName(entity, packet, entityCollection, sourceUri) {
  const nameData = packet.name;
  if (defined(nameData)) {
    entity.name = packet.name;
  }
}
 
function processDescription(entity, packet, entityCollection, sourceUri) {
  const descriptionData = packet.description;
  if (defined(descriptionData)) {
    processPacketData(
      String,
      entity,
      "description",
      descriptionData,
      undefined,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processPosition(entity, packet, entityCollection, sourceUri) {
  const positionData = packet.position;
  if (defined(positionData)) {
    processPositionPacketData(
      entity,
      "position",
      positionData,
      undefined,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processViewFrom(entity, packet, entityCollection, sourceUri) {
  const viewFromData = packet.viewFrom;
  if (defined(viewFromData)) {
    processPacketData(
      Cartesian3,
      entity,
      "viewFrom",
      viewFromData,
      undefined,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processOrientation(entity, packet, entityCollection, sourceUri) {
  const orientationData = packet.orientation;
  if (defined(orientationData)) {
    processPacketData(
      Quaternion,
      entity,
      "orientation",
      orientationData,
      undefined,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processProperties(entity, packet, entityCollection, sourceUri) {
  const propertiesData = packet.properties;
  if (defined(propertiesData)) {
    if (!defined(entity.properties)) {
      entity.properties = new PropertyBag();
    }
 
    // We cannot simply call processPacketData(entity, 'properties', propertyData, undefined, sourceUri, entityCollection)
    // because each property of "properties" may vary separately.
    // The properties will be accessible as entity.properties.myprop.getValue(time).
 
    for (const key in propertiesData) {
      Eif (propertiesData.hasOwnProperty(key)) {
        if (!entity.properties.hasProperty(key)) {
          entity.properties.addProperty(key);
        }
 
        const propertyData = propertiesData[key];
        if (Array.isArray(propertyData)) {
          for (let i = 0, len = propertyData.length; i < len; ++i) {
            processProperty(
              getPropertyType(propertyData[i]),
              entity.properties,
              key,
              propertyData[i],
              undefined,
              sourceUri,
              entityCollection,
            );
          }
        } else {
          processProperty(
            getPropertyType(propertyData),
            entity.properties,
            key,
            propertyData,
            undefined,
            sourceUri,
            entityCollection,
          );
        }
      }
    }
  }
}
 
function processReferencesArrayPacketData(
  object,
  propertyName,
  references,
  interval,
  entityCollection,
  PropertyArrayType,
  CompositePropertyArrayType,
) {
  const properties = references.map(function (reference) {
    return createReferenceProperty(entityCollection, reference);
  });
 
  if (defined(interval)) {
    interval = intervalFromString(interval);
    let property = object[propertyName];
    if (!(property instanceof CompositePropertyArrayType)) {
      // If the property was not already a CompositeProperty,
      // create a CompositeProperty but preserve the existing data.
 
      // Create the composite and add the old property, wrapped in an infinite interval.
      const composite = new CompositePropertyArrayType();
      composite.intervals.addInterval(wrapPropertyInInfiniteInterval(property));
 
      object[propertyName] = property = composite;
    }
 
    interval.data = new PropertyArrayType(properties);
    property.intervals.addInterval(interval);
  } else {
    object[propertyName] = new PropertyArrayType(properties);
  }
}
 
function processArrayPacketData(
  object,
  propertyName,
  packetData,
  entityCollection,
) {
  const references = packetData.references;
  if (defined(references)) {
    processReferencesArrayPacketData(
      object,
      propertyName,
      references,
      packetData.interval,
      entityCollection,
      PropertyArray,
      CompositeProperty,
    );
  } else {
    processPacketData(
      Array,
      object,
      propertyName,
      packetData,
      undefined,
      undefined,
      entityCollection,
    );
  }
}
 
function processArray(object, propertyName, packetData, entityCollection) {
  if (!defined(packetData)) {
    return;
  }
 
  if (Array.isArray(packetData)) {
    for (let i = 0, length = packetData.length; i < length; ++i) {
      processArrayPacketData(
        object,
        propertyName,
        packetData[i],
        entityCollection,
      );
    }
  } else {
    processArrayPacketData(object, propertyName, packetData, entityCollection);
  }
}
 
function processPositionArrayPacketData(
  object,
  propertyName,
  packetData,
  entityCollection,
) {
  const references = packetData.references;
  if (defined(references)) {
    processReferencesArrayPacketData(
      object,
      propertyName,
      references,
      packetData.interval,
      entityCollection,
      PositionPropertyArray,
      CompositePositionProperty,
    );
  } else {
    if (defined(packetData.cartesian)) {
      packetData.array = Cartesian3.unpackArray(packetData.cartesian);
    } else if (defined(packetData.cartographicRadians)) {
      packetData.array = Cartesian3.fromRadiansArrayHeights(
        packetData.cartographicRadians,
        Ellipsoid.default,
      );
    } else Eif (defined(packetData.cartographicDegrees)) {
      packetData.array = Cartesian3.fromDegreesArrayHeights(
        packetData.cartographicDegrees,
        Ellipsoid.default,
      );
    }
 
    Eif (defined(packetData.array)) {
      processPacketData(
        Array,
        object,
        propertyName,
        packetData,
        undefined,
        undefined,
        entityCollection,
      );
    }
  }
}
 
function processPositionArray(
  object,
  propertyName,
  packetData,
  entityCollection,
) {
  if (!defined(packetData)) {
    return;
  }
 
  if (Array.isArray(packetData)) {
    for (let i = 0, length = packetData.length; i < length; ++i) {
      processPositionArrayPacketData(
        object,
        propertyName,
        packetData[i],
        entityCollection,
      );
    }
  } else {
    processPositionArrayPacketData(
      object,
      propertyName,
      packetData,
      entityCollection,
    );
  }
}
 
function unpackCartesianArray(array) {
  return Cartesian3.unpackArray(array);
}
 
function unpackCartographicRadiansArray(array) {
  return Cartesian3.fromRadiansArrayHeights(array, Ellipsoid.default);
}
 
function unpackCartographicDegreesArray(array) {
  return Cartesian3.fromDegreesArrayHeights(array, Ellipsoid.default);
}
 
function processPositionArrayOfArraysPacketData(
  object,
  propertyName,
  packetData,
  entityCollection,
) {
  const references = packetData.references;
  if (defined(references)) {
    const properties = references.map(function (referenceArray) {
      const tempObj = {};
      processReferencesArrayPacketData(
        tempObj,
        "positions",
        referenceArray,
        packetData.interval,
        entityCollection,
        PositionPropertyArray,
        CompositePositionProperty,
      );
      return tempObj.positions;
    });
    object[propertyName] = new PositionPropertyArray(properties);
  } else {
    if (defined(packetData.cartesian)) {
      packetData.array = packetData.cartesian.map(unpackCartesianArray);
    } else if (defined(packetData.cartographicRadians)) {
      packetData.array = packetData.cartographicRadians.map(
        unpackCartographicRadiansArray,
      );
    } else Eif (defined(packetData.cartographicDegrees)) {
      packetData.array = packetData.cartographicDegrees.map(
        unpackCartographicDegreesArray,
      );
    }
 
    Eif (defined(packetData.array)) {
      processPacketData(
        Array,
        object,
        propertyName,
        packetData,
        undefined,
        undefined,
        entityCollection,
      );
    }
  }
}
 
function processPositionArrayOfArrays(
  object,
  propertyName,
  packetData,
  entityCollection,
) {
  if (!defined(packetData)) {
    return;
  }
 
  if (Array.isArray(packetData)) {
    for (let i = 0, length = packetData.length; i < length; ++i) {
      processPositionArrayOfArraysPacketData(
        object,
        propertyName,
        packetData[i],
        entityCollection,
      );
    }
  } else {
    processPositionArrayOfArraysPacketData(
      object,
      propertyName,
      packetData,
      entityCollection,
    );
  }
}
 
function processShape(object, propertyName, packetData, entityCollection) {
  if (!defined(packetData)) {
    return;
  }
 
  Iif (Array.isArray(packetData)) {
    for (let i = 0, length = packetData.length; i < length; i++) {
      processShapePacketData(
        object,
        propertyName,
        packetData[i],
        entityCollection,
      );
    }
  } else {
    processShapePacketData(object, propertyName, packetData, entityCollection);
  }
}
 
function processAvailability(entity, packet, entityCollection, sourceUri) {
  const packetData = packet.availability;
  if (!defined(packetData)) {
    return;
  }
 
  let intervals;
  if (Array.isArray(packetData)) {
    for (let i = 0, len = packetData.length; i < len; ++i) {
      if (!defined(intervals)) {
        intervals = new TimeIntervalCollection();
      }
      intervals.addInterval(intervalFromString(packetData[i]));
    }
  } else {
    intervals = new TimeIntervalCollection();
    intervals.addInterval(intervalFromString(packetData));
  }
  entity.availability = intervals;
}
 
function processAlignedAxis(
  billboard,
  packetData,
  interval,
  sourceUri,
  entityCollection,
) {
  if (!defined(packetData)) {
    return;
  }
 
  processPacketData(
    UnitCartesian3,
    billboard,
    "alignedAxis",
    packetData,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processBillboard(entity, packet, entityCollection, sourceUri) {
  const billboardData = packet.billboard;
  if (!defined(billboardData)) {
    return;
  }
 
  const interval = intervalFromString(billboardData.interval);
  let billboard = entity.billboard;
  if (!defined(billboard)) {
    entity.billboard = billboard = new BillboardGraphics();
  }
 
  processPacketData(
    Boolean,
    billboard,
    "show",
    billboardData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Image,
    billboard,
    "image",
    billboardData.image,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    billboard,
    "scale",
    billboardData.scale,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian2,
    billboard,
    "pixelOffset",
    billboardData.pixelOffset,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian3,
    billboard,
    "eyeOffset",
    billboardData.eyeOffset,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HorizontalOrigin,
    billboard,
    "horizontalOrigin",
    billboardData.horizontalOrigin,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    VerticalOrigin,
    billboard,
    "verticalOrigin",
    billboardData.verticalOrigin,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    billboard,
    "heightReference",
    billboardData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    billboard,
    "color",
    billboardData.color,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rotation,
    billboard,
    "rotation",
    billboardData.rotation,
    interval,
    sourceUri,
    entityCollection,
  );
  processAlignedAxis(
    billboard,
    billboardData.alignedAxis,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    billboard,
    "sizeInMeters",
    billboardData.sizeInMeters,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    billboard,
    "width",
    billboardData.width,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    billboard,
    "height",
    billboardData.height,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    billboard,
    "scaleByDistance",
    billboardData.scaleByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    billboard,
    "translucencyByDistance",
    billboardData.translucencyByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    billboard,
    "pixelOffsetScaleByDistance",
    billboardData.pixelOffsetScaleByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    BoundingRectangle,
    billboard,
    "imageSubRegion",
    billboardData.imageSubRegion,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    billboard,
    "distanceDisplayCondition",
    billboardData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    billboard,
    "disableDepthTestDistance",
    billboardData.disableDepthTestDistance,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processBox(entity, packet, entityCollection, sourceUri) {
  const boxData = packet.box;
  if (!defined(boxData)) {
    return;
  }
 
  const interval = intervalFromString(boxData.interval);
  let box = entity.box;
  Eif (!defined(box)) {
    entity.box = box = new BoxGraphics();
  }
 
  processPacketData(
    Boolean,
    box,
    "show",
    boxData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian3,
    box,
    "dimensions",
    boxData.dimensions,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    box,
    "heightReference",
    boxData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    box,
    "fill",
    boxData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    box,
    "material",
    boxData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    box,
    "outline",
    boxData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    box,
    "outlineColor",
    boxData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    box,
    "outlineWidth",
    boxData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    box,
    "shadows",
    boxData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    box,
    "distanceDisplayCondition",
    boxData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processCorridor(entity, packet, entityCollection, sourceUri) {
  const corridorData = packet.corridor;
  if (!defined(corridorData)) {
    return;
  }
 
  const interval = intervalFromString(corridorData.interval);
  let corridor = entity.corridor;
  Eif (!defined(corridor)) {
    entity.corridor = corridor = new CorridorGraphics();
  }
 
  processPacketData(
    Boolean,
    corridor,
    "show",
    corridorData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPositionArray(
    corridor,
    "positions",
    corridorData.positions,
    entityCollection,
  );
  processPacketData(
    Number,
    corridor,
    "width",
    corridorData.width,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    corridor,
    "height",
    corridorData.height,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    corridor,
    "heightReference",
    corridorData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    corridor,
    "extrudedHeight",
    corridorData.extrudedHeight,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    corridor,
    "extrudedHeightReference",
    corridorData.extrudedHeightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    CornerType,
    corridor,
    "cornerType",
    corridorData.cornerType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    corridor,
    "granularity",
    corridorData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    corridor,
    "fill",
    corridorData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    corridor,
    "material",
    corridorData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    corridor,
    "outline",
    corridorData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    corridor,
    "outlineColor",
    corridorData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    corridor,
    "outlineWidth",
    corridorData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    corridor,
    "shadows",
    corridorData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    corridor,
    "distanceDisplayCondition",
    corridorData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ClassificationType,
    corridor,
    "classificationType",
    corridorData.classificationType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    corridor,
    "zIndex",
    corridorData.zIndex,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processCylinder(entity, packet, entityCollection, sourceUri) {
  const cylinderData = packet.cylinder;
  if (!defined(cylinderData)) {
    return;
  }
 
  const interval = intervalFromString(cylinderData.interval);
  let cylinder = entity.cylinder;
  Eif (!defined(cylinder)) {
    entity.cylinder = cylinder = new CylinderGraphics();
  }
 
  processPacketData(
    Boolean,
    cylinder,
    "show",
    cylinderData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    cylinder,
    "length",
    cylinderData.length,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    cylinder,
    "topRadius",
    cylinderData.topRadius,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    cylinder,
    "bottomRadius",
    cylinderData.bottomRadius,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    cylinder,
    "heightReference",
    cylinderData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    cylinder,
    "fill",
    cylinderData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    cylinder,
    "material",
    cylinderData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    cylinder,
    "outline",
    cylinderData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    cylinder,
    "outlineColor",
    cylinderData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    cylinder,
    "outlineWidth",
    cylinderData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    cylinder,
    "numberOfVerticalLines",
    cylinderData.numberOfVerticalLines,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    cylinder,
    "slices",
    cylinderData.slices,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    cylinder,
    "shadows",
    cylinderData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    cylinder,
    "distanceDisplayCondition",
    cylinderData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processDocument(packet, dataSource) {
  const version = packet.version;
  if (defined(version)) {
    Eif (typeof version === "string") {
      const tokens = version.split(".");
      Eif (tokens.length === 2) {
        Iif (tokens[0] !== "1") {
          throw new RuntimeError("Cesium only supports CZML version 1.");
        }
        dataSource._version = version;
      }
    }
  }
 
  if (!defined(dataSource._version)) {
    throw new RuntimeError(
      "CZML version information invalid.  It is expected to be a property on the document object in the <Major>.<Minor> version format.",
    );
  }
 
  const documentPacket = dataSource._documentPacket;
 
  if (defined(packet.name)) {
    documentPacket.name = packet.name;
  }
 
  const clockPacket = packet.clock;
  if (defined(clockPacket)) {
    const clock = documentPacket.clock;
    if (!defined(clock)) {
      documentPacket.clock = {
        interval: clockPacket.interval,
        currentTime: clockPacket.currentTime,
        range: clockPacket.range,
        step: clockPacket.step,
        multiplier: clockPacket.multiplier,
      };
    } else {
      clock.interval = clockPacket.interval ?? clock.interval;
      clock.currentTime = clockPacket.currentTime ?? clock.currentTime;
      clock.range = clockPacket.range ?? clock.range;
      clock.step = clockPacket.step ?? clock.step;
      clock.multiplier = clockPacket.multiplier ?? clock.multiplier;
    }
  }
}
 
function processEllipse(entity, packet, entityCollection, sourceUri) {
  const ellipseData = packet.ellipse;
  if (!defined(ellipseData)) {
    return;
  }
 
  const interval = intervalFromString(ellipseData.interval);
  let ellipse = entity.ellipse;
  Eif (!defined(ellipse)) {
    entity.ellipse = ellipse = new EllipseGraphics();
  }
 
  processPacketData(
    Boolean,
    ellipse,
    "show",
    ellipseData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "semiMajorAxis",
    ellipseData.semiMajorAxis,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "semiMinorAxis",
    ellipseData.semiMinorAxis,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "height",
    ellipseData.height,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    ellipse,
    "heightReference",
    ellipseData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "extrudedHeight",
    ellipseData.extrudedHeight,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    ellipse,
    "extrudedHeightReference",
    ellipseData.extrudedHeightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rotation,
    ellipse,
    "rotation",
    ellipseData.rotation,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rotation,
    ellipse,
    "stRotation",
    ellipseData.stRotation,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "granularity",
    ellipseData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    ellipse,
    "fill",
    ellipseData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    ellipse,
    "material",
    ellipseData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    ellipse,
    "outline",
    ellipseData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    ellipse,
    "outlineColor",
    ellipseData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "outlineWidth",
    ellipseData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "numberOfVerticalLines",
    ellipseData.numberOfVerticalLines,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    ellipse,
    "shadows",
    ellipseData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    ellipse,
    "distanceDisplayCondition",
    ellipseData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ClassificationType,
    ellipse,
    "classificationType",
    ellipseData.classificationType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipse,
    "zIndex",
    ellipseData.zIndex,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processEllipsoid(entity, packet, entityCollection, sourceUri) {
  const ellipsoidData = packet.ellipsoid;
  if (!defined(ellipsoidData)) {
    return;
  }
 
  const interval = intervalFromString(ellipsoidData.interval);
  let ellipsoid = entity.ellipsoid;
  Eif (!defined(ellipsoid)) {
    entity.ellipsoid = ellipsoid = new EllipsoidGraphics();
  }
 
  processPacketData(
    Boolean,
    ellipsoid,
    "show",
    ellipsoidData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian3,
    ellipsoid,
    "radii",
    ellipsoidData.radii,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian3,
    ellipsoid,
    "innerRadii",
    ellipsoidData.innerRadii,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "minimumClock",
    ellipsoidData.minimumClock,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "maximumClock",
    ellipsoidData.maximumClock,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "minimumCone",
    ellipsoidData.minimumCone,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "maximumCone",
    ellipsoidData.maximumCone,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    ellipsoid,
    "heightReference",
    ellipsoidData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    ellipsoid,
    "fill",
    ellipsoidData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    ellipsoid,
    "material",
    ellipsoidData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    ellipsoid,
    "outline",
    ellipsoidData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    ellipsoid,
    "outlineColor",
    ellipsoidData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "outlineWidth",
    ellipsoidData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "stackPartitions",
    ellipsoidData.stackPartitions,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "slicePartitions",
    ellipsoidData.slicePartitions,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    ellipsoid,
    "subdivisions",
    ellipsoidData.subdivisions,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    ellipsoid,
    "shadows",
    ellipsoidData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    ellipsoid,
    "distanceDisplayCondition",
    ellipsoidData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processLabel(entity, packet, entityCollection, sourceUri) {
  const labelData = packet.label;
  if (!defined(labelData)) {
    return;
  }
 
  const interval = intervalFromString(labelData.interval);
  let label = entity.label;
  Eif (!defined(label)) {
    entity.label = label = new LabelGraphics();
  }
 
  processPacketData(
    Boolean,
    label,
    "show",
    labelData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    String,
    label,
    "text",
    labelData.text,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    String,
    label,
    "font",
    labelData.font,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    LabelStyle,
    label,
    "style",
    labelData.style,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    label,
    "scale",
    labelData.scale,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    label,
    "showBackground",
    labelData.showBackground,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    label,
    "backgroundColor",
    labelData.backgroundColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian2,
    label,
    "backgroundPadding",
    labelData.backgroundPadding,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian2,
    label,
    "pixelOffset",
    labelData.pixelOffset,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Cartesian3,
    label,
    "eyeOffset",
    labelData.eyeOffset,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HorizontalOrigin,
    label,
    "horizontalOrigin",
    labelData.horizontalOrigin,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    VerticalOrigin,
    label,
    "verticalOrigin",
    labelData.verticalOrigin,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    label,
    "heightReference",
    labelData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    label,
    "fillColor",
    labelData.fillColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    label,
    "outlineColor",
    labelData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    label,
    "outlineWidth",
    labelData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    label,
    "translucencyByDistance",
    labelData.translucencyByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    label,
    "pixelOffsetScaleByDistance",
    labelData.pixelOffsetScaleByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    label,
    "scaleByDistance",
    labelData.scaleByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    label,
    "distanceDisplayCondition",
    labelData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    label,
    "disableDepthTestDistance",
    labelData.disableDepthTestDistance,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processModel(entity, packet, entityCollection, sourceUri) {
  const modelData = packet.model;
  if (!defined(modelData)) {
    return;
  }
 
  const interval = intervalFromString(modelData.interval);
  let model = entity.model;
  Eif (!defined(model)) {
    entity.model = model = new ModelGraphics();
  }
 
  processPacketData(
    Boolean,
    model,
    "show",
    modelData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Uri,
    model,
    "uri",
    modelData.gltf,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    model,
    "scale",
    modelData.scale,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    model,
    "minimumPixelSize",
    modelData.minimumPixelSize,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    model,
    "maximumScale",
    modelData.maximumScale,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    model,
    "incrementallyLoadTextures",
    modelData.incrementallyLoadTextures,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    model,
    "runAnimations",
    modelData.runAnimations,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    model,
    "clampAnimations",
    modelData.clampAnimations,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    model,
    "shadows",
    modelData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    model,
    "heightReference",
    modelData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    model,
    "silhouetteColor",
    modelData.silhouetteColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    model,
    "silhouetteSize",
    modelData.silhouetteSize,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    model,
    "color",
    modelData.color,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ColorBlendMode,
    model,
    "colorBlendMode",
    modelData.colorBlendMode,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    model,
    "colorBlendAmount",
    modelData.colorBlendAmount,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    model,
    "distanceDisplayCondition",
    modelData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
 
  let i, len;
  const nodeTransformationsData = modelData.nodeTransformations;
  if (defined(nodeTransformationsData)) {
    if (Array.isArray(nodeTransformationsData)) {
      for (i = 0, len = nodeTransformationsData.length; i < len; ++i) {
        processNodeTransformations(
          model,
          nodeTransformationsData[i],
          interval,
          sourceUri,
          entityCollection,
        );
      }
    } else {
      processNodeTransformations(
        model,
        nodeTransformationsData,
        interval,
        sourceUri,
        entityCollection,
      );
    }
  }
 
  const articulationsData = modelData.articulations;
  if (defined(articulationsData)) {
    if (Array.isArray(articulationsData)) {
      for (i = 0, len = articulationsData.length; i < len; ++i) {
        processArticulations(
          model,
          articulationsData[i],
          interval,
          sourceUri,
          entityCollection,
        );
      }
    } else {
      processArticulations(
        model,
        articulationsData,
        interval,
        sourceUri,
        entityCollection,
      );
    }
  }
}
 
function processNodeTransformations(
  model,
  nodeTransformationsData,
  constrainedInterval,
  sourceUri,
  entityCollection,
) {
  let combinedInterval = intervalFromString(nodeTransformationsData.interval);
  if (defined(constrainedInterval)) {
    if (defined(combinedInterval)) {
      combinedInterval = TimeInterval.intersect(
        combinedInterval,
        constrainedInterval,
        scratchTimeInterval,
      );
    } else {
      combinedInterval = constrainedInterval;
    }
  }
 
  let nodeTransformations = model.nodeTransformations;
  const nodeNames = Object.keys(nodeTransformationsData);
  for (let i = 0, len = nodeNames.length; i < len; ++i) {
    const nodeName = nodeNames[i];
    if (nodeName === "interval") {
      continue;
    }
 
    const nodeTransformationData = nodeTransformationsData[nodeName];
    Iif (!defined(nodeTransformationData)) {
      continue;
    }
 
    if (!defined(nodeTransformations)) {
      model.nodeTransformations = nodeTransformations = new PropertyBag();
    }
 
    if (!nodeTransformations.hasProperty(nodeName)) {
      nodeTransformations.addProperty(nodeName);
    }
 
    let nodeTransformation = nodeTransformations[nodeName];
    if (!defined(nodeTransformation)) {
      nodeTransformations[nodeName] = nodeTransformation =
        new NodeTransformationProperty();
    }
 
    processPacketData(
      Cartesian3,
      nodeTransformation,
      "translation",
      nodeTransformationData.translation,
      combinedInterval,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Quaternion,
      nodeTransformation,
      "rotation",
      nodeTransformationData.rotation,
      combinedInterval,
      sourceUri,
      entityCollection,
    );
    processPacketData(
      Cartesian3,
      nodeTransformation,
      "scale",
      nodeTransformationData.scale,
      combinedInterval,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processArticulations(
  model,
  articulationsData,
  constrainedInterval,
  sourceUri,
  entityCollection,
) {
  let combinedInterval = intervalFromString(articulationsData.interval);
  if (defined(constrainedInterval)) {
    if (defined(combinedInterval)) {
      combinedInterval = TimeInterval.intersect(
        combinedInterval,
        constrainedInterval,
        scratchTimeInterval,
      );
    } else {
      combinedInterval = constrainedInterval;
    }
  }
 
  let articulations = model.articulations;
  const keys = Object.keys(articulationsData);
  for (let i = 0, len = keys.length; i < len; ++i) {
    const key = keys[i];
    if (key === "interval") {
      continue;
    }
 
    const articulationStageData = articulationsData[key];
    Iif (!defined(articulationStageData)) {
      continue;
    }
 
    if (!defined(articulations)) {
      model.articulations = articulations = new PropertyBag();
    }
 
    if (!articulations.hasProperty(key)) {
      articulations.addProperty(key);
    }
 
    processPacketData(
      Number,
      articulations,
      key,
      articulationStageData,
      combinedInterval,
      sourceUri,
      entityCollection,
    );
  }
}
 
function processPath(entity, packet, entityCollection, sourceUri) {
  const pathData = packet.path;
  if (!defined(pathData)) {
    return;
  }
 
  const interval = intervalFromString(pathData.interval);
  let path = entity.path;
  Eif (!defined(path)) {
    entity.path = path = new PathGraphics();
  }
 
  processPacketData(
    Boolean,
    path,
    "show",
    pathData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    path,
    "leadTime",
    pathData.leadTime,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    path,
    "trailTime",
    pathData.trailTime,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    path,
    "width",
    pathData.width,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    path,
    "resolution",
    pathData.resolution,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    path,
    "material",
    pathData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    path,
    "distanceDisplayCondition",
    pathData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processPoint(entity, packet, entityCollection, sourceUri) {
  const pointData = packet.point;
  if (!defined(pointData)) {
    return;
  }
 
  const interval = intervalFromString(pointData.interval);
  let point = entity.point;
  Eif (!defined(point)) {
    entity.point = point = new PointGraphics();
  }
 
  processPacketData(
    Boolean,
    point,
    "show",
    pointData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    point,
    "pixelSize",
    pointData.pixelSize,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    point,
    "heightReference",
    pointData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    point,
    "color",
    pointData.color,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    point,
    "outlineColor",
    pointData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    point,
    "outlineWidth",
    pointData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    point,
    "scaleByDistance",
    pointData.scaleByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    NearFarScalar,
    point,
    "translucencyByDistance",
    pointData.translucencyByDistance,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    point,
    "distanceDisplayCondition",
    pointData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    point,
    "disableDepthTestDistance",
    pointData.disableDepthTestDistance,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function PolygonHierarchyProperty(polygon) {
  this.polygon = polygon;
  this._definitionChanged = new Event();
}
 
Object.defineProperties(PolygonHierarchyProperty.prototype, {
  isConstant: {
    get: function () {
      const positions = this.polygon._positions;
      const holes = this.polygon._holes;
      return (
        (!defined(positions) || positions.isConstant) &&
        (!defined(holes) || holes.isConstant)
      );
    },
  },
  definitionChanged: {
    get: function () {
      return this._definitionChanged;
    },
  },
});
 
PolygonHierarchyProperty.prototype.getValue = function (time, result) {
  let positions;
  if (defined(this.polygon._positions)) {
    positions = this.polygon._positions.getValue(time);
  }
 
  let holes;
  if (defined(this.polygon._holes)) {
    holes = this.polygon._holes.getValue(time);
    Eif (defined(holes)) {
      holes = holes.map(function (holePositions) {
        return new PolygonHierarchy(holePositions);
      });
    }
  }
 
  if (!defined(result)) {
    return new PolygonHierarchy(positions, holes);
  }
 
  result.positions = positions;
  result.holes = holes;
  return result;
};
 
PolygonHierarchyProperty.prototype.equals = function (other) {
  return (
    this === other ||
    (other instanceof PolygonHierarchyProperty &&
      Property.equals(this.polygon._positions, other.polygon._positions) &&
      Property.equals(this.polygon._holes, other.polygon._holes))
  );
};
 
function processPolygon(entity, packet, entityCollection, sourceUri) {
  const polygonData = packet.polygon;
  if (!defined(polygonData)) {
    return;
  }
 
  const interval = intervalFromString(polygonData.interval);
  let polygon = entity.polygon;
  if (!defined(polygon)) {
    entity.polygon = polygon = new PolygonGraphics();
  }
 
  processPacketData(
    Boolean,
    polygon,
    "show",
    polygonData.show,
    interval,
    sourceUri,
    entityCollection,
  );
 
  // adapt 'position' property producing Cartesian[]
  // and 'holes' property producing Cartesian[][]
  // to a single property producing PolygonHierarchy
  processPositionArray(
    polygon,
    "_positions",
    polygonData.positions,
    entityCollection,
  );
  processPositionArrayOfArrays(
    polygon,
    "_holes",
    polygonData.holes,
    entityCollection,
  );
  if (defined(polygon._positions) || defined(polygon._holes)) {
    polygon.hierarchy = new PolygonHierarchyProperty(polygon);
  }
 
  processPacketData(
    Number,
    polygon,
    "height",
    polygonData.height,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    polygon,
    "heightReference",
    polygonData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polygon,
    "extrudedHeight",
    polygonData.extrudedHeight,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    polygon,
    "extrudedHeightReference",
    polygonData.extrudedHeightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rotation,
    polygon,
    "stRotation",
    polygonData.stRotation,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polygon,
    "granularity",
    polygonData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polygon,
    "fill",
    polygonData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    polygon,
    "material",
    polygonData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polygon,
    "outline",
    polygonData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    polygon,
    "outlineColor",
    polygonData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polygon,
    "outlineWidth",
    polygonData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polygon,
    "perPositionHeight",
    polygonData.perPositionHeight,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polygon,
    "closeTop",
    polygonData.closeTop,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polygon,
    "closeBottom",
    polygonData.closeBottom,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ArcType,
    polygon,
    "arcType",
    polygonData.arcType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    polygon,
    "shadows",
    polygonData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    polygon,
    "distanceDisplayCondition",
    polygonData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ClassificationType,
    polygon,
    "classificationType",
    polygonData.classificationType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polygon,
    "zIndex",
    polygonData.zIndex,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function adaptFollowSurfaceToArcType(followSurface) {
  return followSurface ? ArcType.GEODESIC : ArcType.NONE;
}
 
function processPolyline(entity, packet, entityCollection, sourceUri) {
  const polylineData = packet.polyline;
  if (!defined(polylineData)) {
    return;
  }
 
  const interval = intervalFromString(polylineData.interval);
  let polyline = entity.polyline;
  Eif (!defined(polyline)) {
    entity.polyline = polyline = new PolylineGraphics();
  }
 
  processPacketData(
    Boolean,
    polyline,
    "show",
    polylineData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPositionArray(
    polyline,
    "positions",
    polylineData.positions,
    entityCollection,
  );
  processPacketData(
    Number,
    polyline,
    "width",
    polylineData.width,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polyline,
    "granularity",
    polylineData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    polyline,
    "material",
    polylineData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    polyline,
    "depthFailMaterial",
    polylineData.depthFailMaterial,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ArcType,
    polyline,
    "arcType",
    polylineData.arcType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polyline,
    "clampToGround",
    polylineData.clampToGround,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    polyline,
    "shadows",
    polylineData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    polyline,
    "distanceDisplayCondition",
    polylineData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ClassificationType,
    polyline,
    "classificationType",
    polylineData.classificationType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polyline,
    "zIndex",
    polylineData.zIndex,
    interval,
    sourceUri,
    entityCollection,
  );
 
  // for backwards compatibility, adapt CZML followSurface to arcType.
  if (defined(polylineData.followSurface) && !defined(polylineData.arcType)) {
    const tempObj = {};
    processPacketData(
      Boolean,
      tempObj,
      "followSurface",
      polylineData.followSurface,
      interval,
      sourceUri,
      entityCollection,
    );
    polyline.arcType = createAdapterProperty(
      tempObj.followSurface,
      adaptFollowSurfaceToArcType,
    );
  }
}
 
function processPolylineVolume(entity, packet, entityCollection, sourceUri) {
  const polylineVolumeData = packet.polylineVolume;
  if (!defined(polylineVolumeData)) {
    return;
  }
 
  const interval = intervalFromString(polylineVolumeData.interval);
  let polylineVolume = entity.polylineVolume;
  Eif (!defined(polylineVolume)) {
    entity.polylineVolume = polylineVolume = new PolylineVolumeGraphics();
  }
 
  processPositionArray(
    polylineVolume,
    "positions",
    polylineVolumeData.positions,
    entityCollection,
  );
  processShape(
    polylineVolume,
    "shape",
    polylineVolumeData.shape,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polylineVolume,
    "show",
    polylineVolumeData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    CornerType,
    polylineVolume,
    "cornerType",
    polylineVolumeData.cornerType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polylineVolume,
    "fill",
    polylineVolumeData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    polylineVolume,
    "material",
    polylineVolumeData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    polylineVolume,
    "outline",
    polylineVolumeData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    polylineVolume,
    "outlineColor",
    polylineVolumeData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polylineVolume,
    "outlineWidth",
    polylineVolumeData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    polylineVolume,
    "granularity",
    polylineVolumeData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    polylineVolume,
    "shadows",
    polylineVolumeData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    polylineVolume,
    "distanceDisplayCondition",
    polylineVolumeData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processRectangle(entity, packet, entityCollection, sourceUri) {
  const rectangleData = packet.rectangle;
  if (!defined(rectangleData)) {
    return;
  }
 
  const interval = intervalFromString(rectangleData.interval);
  let rectangle = entity.rectangle;
  Eif (!defined(rectangle)) {
    entity.rectangle = rectangle = new RectangleGraphics();
  }
 
  processPacketData(
    Boolean,
    rectangle,
    "show",
    rectangleData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rectangle,
    rectangle,
    "coordinates",
    rectangleData.coordinates,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    rectangle,
    "height",
    rectangleData.height,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    rectangle,
    "heightReference",
    rectangleData.heightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    rectangle,
    "extrudedHeight",
    rectangleData.extrudedHeight,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    HeightReference,
    rectangle,
    "extrudedHeightReference",
    rectangleData.extrudedHeightReference,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rotation,
    rectangle,
    "rotation",
    rectangleData.rotation,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Rotation,
    rectangle,
    "stRotation",
    rectangleData.stRotation,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    rectangle,
    "granularity",
    rectangleData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    rectangle,
    "fill",
    rectangleData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    rectangle,
    "material",
    rectangleData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    rectangle,
    "outline",
    rectangleData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    rectangle,
    "outlineColor",
    rectangleData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    rectangle,
    "outlineWidth",
    rectangleData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    rectangle,
    "shadows",
    rectangleData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    rectangle,
    "distanceDisplayCondition",
    rectangleData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ClassificationType,
    rectangle,
    "classificationType",
    rectangleData.classificationType,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    rectangle,
    "zIndex",
    rectangleData.zIndex,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processTileset(entity, packet, entityCollection, sourceUri) {
  const tilesetData = packet.tileset;
  if (!defined(tilesetData)) {
    return;
  }
 
  const interval = intervalFromString(tilesetData.interval);
  let tileset = entity.tileset;
  Eif (!defined(tileset)) {
    entity.tileset = tileset = new Cesium3DTilesetGraphics();
  }
 
  processPacketData(
    Boolean,
    tileset,
    "show",
    tilesetData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Uri,
    tileset,
    "uri",
    tilesetData.uri,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    tileset,
    "maximumScreenSpaceError",
    tilesetData.maximumScreenSpaceError,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processWall(entity, packet, entityCollection, sourceUri) {
  const wallData = packet.wall;
  if (!defined(wallData)) {
    return;
  }
 
  const interval = intervalFromString(wallData.interval);
  let wall = entity.wall;
  Eif (!defined(wall)) {
    entity.wall = wall = new WallGraphics();
  }
 
  processPacketData(
    Boolean,
    wall,
    "show",
    wallData.show,
    interval,
    sourceUri,
    entityCollection,
  );
  processPositionArray(wall, "positions", wallData.positions, entityCollection);
  processArray(
    wall,
    "minimumHeights",
    wallData.minimumHeights,
    entityCollection,
  );
  processArray(
    wall,
    "maximumHeights",
    wallData.maximumHeights,
    entityCollection,
  );
  processPacketData(
    Number,
    wall,
    "granularity",
    wallData.granularity,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    wall,
    "fill",
    wallData.fill,
    interval,
    sourceUri,
    entityCollection,
  );
  processMaterialPacketData(
    wall,
    "material",
    wallData.material,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Boolean,
    wall,
    "outline",
    wallData.outline,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Color,
    wall,
    "outlineColor",
    wallData.outlineColor,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    Number,
    wall,
    "outlineWidth",
    wallData.outlineWidth,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    ShadowMode,
    wall,
    "shadows",
    wallData.shadows,
    interval,
    sourceUri,
    entityCollection,
  );
  processPacketData(
    DistanceDisplayCondition,
    wall,
    "distanceDisplayCondition",
    wallData.distanceDisplayCondition,
    interval,
    sourceUri,
    entityCollection,
  );
}
 
function processCzmlPacket(
  packet,
  entityCollection,
  updaterFunctions,
  sourceUri,
  dataSource,
) {
  let objectId = packet.id;
  if (!defined(objectId)) {
    objectId = createGuid();
  }
 
  currentId = objectId;
 
  if (!defined(dataSource._version) && objectId !== "document") {
    throw new RuntimeError(
      "The first CZML packet is required to be the document object.",
    );
  }
 
  if (packet["delete"] === true) {
    entityCollection.removeById(objectId);
  } else if (objectId === "document") {
    processDocument(packet, dataSource);
  } else {
    const entity = entityCollection.getOrCreateEntity(objectId);
 
    const parentId = packet.parent;
    if (defined(parentId)) {
      entity.parent = entityCollection.getOrCreateEntity(parentId);
    }
 
    for (let i = updaterFunctions.length - 1; i > -1; i--) {
      updaterFunctions[i](entity, packet, entityCollection, sourceUri);
    }
  }
 
  currentId = undefined;
}
 
function updateClock(dataSource) {
  let clock;
  const clockPacket = dataSource._documentPacket.clock;
  if (!defined(clockPacket)) {
    if (!defined(dataSource._clock)) {
      const availability = dataSource._entityCollection.computeAvailability();
      if (!availability.start.equals(Iso8601.MINIMUM_VALUE)) {
        const startTime = availability.start;
        const stopTime = availability.stop;
        const totalSeconds = JulianDate.secondsDifference(stopTime, startTime);
        const multiplier = Math.round(totalSeconds / 120.0);
 
        clock = new DataSourceClock();
        clock.startTime = JulianDate.clone(startTime);
        clock.stopTime = JulianDate.clone(stopTime);
        clock.clockRange = ClockRange.LOOP_STOP;
        clock.multiplier = multiplier;
        clock.currentTime = JulianDate.clone(startTime);
        clock.clockStep = ClockStep.SYSTEM_CLOCK_MULTIPLIER;
        dataSource._clock = clock;
        return true;
      }
    }
    return false;
  }
 
  if (defined(dataSource._clock)) {
    clock = dataSource._clock.clone();
  } else {
    clock = new DataSourceClock();
    clock.startTime = Iso8601.MINIMUM_VALUE.clone();
    clock.stopTime = Iso8601.MAXIMUM_VALUE.clone();
    clock.currentTime = Iso8601.MINIMUM_VALUE.clone();
    clock.clockRange = ClockRange.LOOP_STOP;
    clock.clockStep = ClockStep.SYSTEM_CLOCK_MULTIPLIER;
    clock.multiplier = 1.0;
  }
 
  const interval = intervalFromString(clockPacket.interval);
  Eif (defined(interval)) {
    clock.startTime = interval.start;
    clock.stopTime = interval.stop;
  }
 
  if (defined(clockPacket.currentTime)) {
    clock.currentTime = JulianDate.fromIso8601(clockPacket.currentTime);
  }
  if (defined(clockPacket.range)) {
    clock.clockRange = ClockRange[clockPacket.range] ?? ClockRange.LOOP_STOP;
  }
  if (defined(clockPacket.step)) {
    clock.clockStep =
      ClockStep[clockPacket.step] ?? ClockStep.SYSTEM_CLOCK_MULTIPLIER;
  }
  if (defined(clockPacket.multiplier)) {
    clock.multiplier = clockPacket.multiplier;
  }
 
  if (!clock.equals(dataSource._clock)) {
    dataSource._clock = clock.clone(dataSource._clock);
    return true;
  }
 
  return false;
}
 
function load(dataSource, czml, options, clear) {
  //>>includeStart('debug', pragmas.debug);
  if (!defined(czml)) {
    throw new DeveloperError("czml is required.");
  }
  //>>includeEnd('debug');
 
  options = options ?? Frozen.EMPTY_OBJECT;
 
  let promise = czml;
  let sourceUri = options.sourceUri;
 
  // User specified credit
  let credit = options.credit;
  if (typeof credit === "string") {
    credit = new Credit(credit);
  }
  dataSource._credit = credit;
 
  // If the czml is a URL
  if (typeof czml === "string" || czml instanceof Resource) {
    czml = Resource.createIfNeeded(czml);
    promise = czml.fetchJson();
    sourceUri = sourceUri ?? czml.clone();
 
    // Add resource credits to our list of credits to display
    const resourceCredits = dataSource._resourceCredits;
    const credits = czml.credits;
    Iif (defined(credits)) {
      const length = credits.length;
      for (let i = 0; i < length; i++) {
        resourceCredits.push(credits[i]);
      }
    }
  }
 
  sourceUri = Resource.createIfNeeded(sourceUri);
 
  DataSource.setLoading(dataSource, true);
 
  return Promise.resolve(promise)
    .then(function (czml) {
      return loadCzml(dataSource, czml, sourceUri, clear);
    })
    .catch(function (error) {
      DataSource.setLoading(dataSource, false);
      dataSource._error.raiseEvent(dataSource, error);
      console.log(error);
      return Promise.reject(error);
    });
}
 
function loadCzml(dataSource, czml, sourceUri, clear) {
  DataSource.setLoading(dataSource, true);
  const entityCollection = dataSource._entityCollection;
 
  if (clear) {
    dataSource._version = undefined;
    dataSource._documentPacket = new DocumentPacket();
    entityCollection.removeAll();
  }
 
  CzmlDataSource._processCzml(
    czml,
    entityCollection,
    sourceUri,
    undefined,
    dataSource,
  );
 
  let raiseChangedEvent = updateClock(dataSource);
 
  const documentPacket = dataSource._documentPacket;
  if (
    defined(documentPacket.name) &&
    dataSource._name !== documentPacket.name
  ) {
    dataSource._name = documentPacket.name;
    raiseChangedEvent = true;
  } else if (!defined(dataSource._name) && defined(sourceUri)) {
    dataSource._name = getFilenameFromUri(sourceUri.getUrlComponent());
    raiseChangedEvent = true;
  }
 
  DataSource.setLoading(dataSource, false);
  if (raiseChangedEvent) {
    dataSource._changed.raiseEvent(dataSource);
  }
 
  return dataSource;
}
 
function DocumentPacket() {
  this.name = undefined;
  this.clock = undefined;
}
 
/**
 * @typedef {object} CzmlDataSource.LoadOptions
 *
 * Initialization options for the <code>load</code> method.
 *
 * @property {Resource|string} [sourceUri] Overrides the url to use for resolving relative links.
 * @property {Credit|string} [credit] A credit for the data source, which is displayed on the canvas.
 */
 
/**
 * A {@link DataSource} which processes {@link https://github.com/AnalyticalGraphicsInc/czml-writer/wiki/CZML-Guide|CZML}.
 * @alias CzmlDataSource
 * @constructor
 *
 * @param {string} [name] An optional name for the data source.  This value will be overwritten if a loaded document contains a name.
 *
 * @demo {@link https://sandcastle.cesium.com/index.html?src=CZML.html|Cesium Sandcastle CZML Demo}
 */
function CzmlDataSource(name) {
  this._name = name;
  this._changed = new Event();
  this._error = new Event();
  this._isLoading = false;
  this._loading = new Event();
  this._clock = undefined;
  this._documentPacket = new DocumentPacket();
  this._version = undefined;
  this._entityCollection = new EntityCollection(this);
  this._entityCluster = new EntityCluster();
  this._credit = undefined;
  this._resourceCredits = [];
}
 
/**
 * Creates a Promise to a new instance loaded with the provided CZML data.
 *
 * @param {Resource|string|object} czml A url or CZML object to be processed.
 * @param {CzmlDataSource.LoadOptions} [options] An object specifying configuration options
 *
 * @returns {Promise<CzmlDataSource>} A promise that resolves to the new instance once the data is processed.
 */
CzmlDataSource.load = function (czml, options) {
  return new CzmlDataSource().load(czml, options);
};
 
Object.defineProperties(CzmlDataSource.prototype, {
  /**
   * Gets a human-readable name for this instance.
   * @memberof CzmlDataSource.prototype
   * @type {string}
   */
  name: {
    get: function () {
      return this._name;
    },
  },
  /**
   * Gets the clock settings defined by the loaded CZML.  If no clock is explicitly
   * defined in the CZML, the combined availability of all objects is returned.  If
   * only static data exists, this value is undefined.
   * @memberof CzmlDataSource.prototype
   * @type {DataSourceClock}
   */
  clock: {
    get: function () {
      return this._clock;
    },
  },
  /**
   * Gets the collection of {@link Entity} instances.
   * @memberof CzmlDataSource.prototype
   * @type {EntityCollection}
   */
  entities: {
    get: function () {
      return this._entityCollection;
    },
  },
  /**
   * Gets a value indicating if the data source is currently loading data.
   * @memberof CzmlDataSource.prototype
   * @type {boolean}
   */
  isLoading: {
    get: function () {
      return this._isLoading;
    },
  },
  /**
   * Gets an event that will be raised when the underlying data changes.
   * @memberof CzmlDataSource.prototype
   * @type {Event}
   */
  changedEvent: {
    get: function () {
      return this._changed;
    },
  },
  /**
   * Gets an event that will be raised if an error is encountered during processing.
   * @memberof CzmlDataSource.prototype
   * @type {Event}
   */
  errorEvent: {
    get: function () {
      return this._error;
    },
  },
  /**
   * Gets an event that will be raised when the data source either starts or stops loading.
   * @memberof CzmlDataSource.prototype
   * @type {Event}
   */
  loadingEvent: {
    get: function () {
      return this._loading;
    },
  },
  /**
   * Gets whether or not this data source should be displayed.
   * @memberof CzmlDataSource.prototype
   * @type {boolean}
   */
  show: {
    get: function () {
      return this._entityCollection.show;
    },
    set: function (value) {
      this._entityCollection.show = value;
    },
  },
 
  /**
   * Gets or sets the clustering options for this data source. This object can be shared between multiple data sources.
   *
   * @memberof CzmlDataSource.prototype
   * @type {EntityCluster}
   */
  clustering: {
    get: function () {
      return this._entityCluster;
    },
    set: function (value) {
      //>>includeStart('debug', pragmas.debug);
      if (!defined(value)) {
        throw new DeveloperError("value must be defined.");
      }
      //>>includeEnd('debug');
      this._entityCluster = value;
    },
  },
  /**
   * Gets the credit that will be displayed for the data source
   * @memberof CzmlDataSource.prototype
   * @type {Credit}
   */
  credit: {
    get: function () {
      return this._credit;
    },
  },
});
 
/**
 * @callback CzmlDataSource.UpdaterFunction
 *
 * A CZML processing function that adds or updates entities in the provided
 * collection based on the provided CZML packet.
 *
 * @param {Entity} entity
 * @param {object} packet
 * @param {EntityCollection} entityCollection
 * @param {string} sourceUri
 */
 
/**
 * Gets the array of CZML processing functions.
 * @memberof CzmlDataSource
 * @type {CzmlDataSource.UpdaterFunction[]}
 */
CzmlDataSource.updaters = [
  processBillboard,
  processBox,
  processCorridor,
  processCylinder,
  processEllipse,
  processEllipsoid,
  processLabel,
  processModel,
  processName,
  processDescription,
  processPath,
  processPoint,
  processPolygon,
  processPolyline,
  processPolylineVolume,
  processProperties,
  processRectangle,
  processPosition,
  processTileset,
  processViewFrom,
  processWall,
  processOrientation,
  processAvailability,
];
 
/**
 * Add the provided updater to the list of updaters if not already included
 * @private
 * @param {CzmlDataSource.UpdaterFunction} updater
 */
CzmlDataSource.registerUpdater = function (updater) {
  Eif (!CzmlDataSource.updaters.includes(updater)) {
    CzmlDataSource.updaters.push(updater);
  }
};
 
/**
 * Remove the provided updater from the list of updaters if already included
 * @private
 * @param {CzmlDataSource.UpdaterFunction} updater
 */
CzmlDataSource.unregisterUpdater = function (updater) {
  Eif (CzmlDataSource.updaters.includes(updater)) {
    const index = CzmlDataSource.updaters.indexOf(updater);
    CzmlDataSource.updaters.splice(index, 1);
  }
};
 
/**
 * Processes the provided url or CZML object without clearing any existing data.
 *
 * @param {Resource|string|object} czml A url or CZML object to be processed.
 * @param {CzmlDataSource.LoadOptions} [options] An object specifying configuration options
 *
 * @returns {Promise<CzmlDataSource>} A promise that resolves to this instances once the data is processed.
 */
CzmlDataSource.prototype.process = function (czml, options) {
  return load(this, czml, options, false);
};
 
/**
 * Loads the provided url or CZML object, replacing any existing data.
 *
 * @param {Resource|string|object} czml A url or CZML object to be processed.
 * @param {CzmlDataSource.LoadOptions} [options] An object specifying configuration options
 *
 * @returns {Promise<CzmlDataSource>} A promise that resolves to this instances once the data is processed.
 */
CzmlDataSource.prototype.load = function (czml, options) {
  return load(this, czml, options, true);
};
 
/**
 * Updates the data source to the provided time.  This function is optional and
 * is not required to be implemented.  It is provided for data sources which
 * retrieve data based on the current animation time or scene state.
 * If implemented, update will be called by {@link DataSourceDisplay} once a frame.
 *
 * @param {JulianDate} time The simulation time.
 * @returns {boolean} True if this data source is ready to be displayed at the provided time, false otherwise.
 */
CzmlDataSource.prototype.update = function (time) {
  return true;
};
 
/**
 * A helper function used by custom CZML updater functions
 * which creates or updates a {@link Property} from a CZML packet.
 * @function
 *
 * @param {Function} type The constructor function for the property being processed.
 * @param {object} object The object on which the property will be added or updated.
 * @param {string} propertyName The name of the property on the object.
 * @param {object} packetData The CZML packet being processed.
 * @param {TimeInterval} interval A constraining interval for which the data is valid.
 * @param {string} sourceUri The originating uri of the data being processed.
 * @param {EntityCollection} entityCollection The collection being processsed.
 */
CzmlDataSource.processPacketData = processPacketData;
 
/**
 * A helper function used by custom CZML updater functions
 * which creates or updates a {@link PositionProperty} from a CZML packet.
 * @function
 *
 * @param {object} object The object on which the property will be added or updated.
 * @param {string} propertyName The name of the property on the object.
 * @param {object} packetData The CZML packet being processed.
 * @param {TimeInterval} interval A constraining interval for which the data is valid.
 * @param {string} sourceUri The originating uri of the data being processed.
 * @param {EntityCollection} entityCollection The collection being processsed.
 */
CzmlDataSource.processPositionPacketData = processPositionPacketData;
 
/**
 * A helper function used by custom CZML updater functions
 * which creates or updates a {@link MaterialProperty} from a CZML packet.
 * @function
 *
 * @param {object} object The object on which the property will be added or updated.
 * @param {string} propertyName The name of the property on the object.
 * @param {object} packetData The CZML packet being processed.
 * @param {TimeInterval} interval A constraining interval for which the data is valid.
 * @param {string} sourceUri The originating uri of the data being processed.
 * @param {EntityCollection} entityCollection The collection being processsed.
 */
CzmlDataSource.processMaterialPacketData = processMaterialPacketData;
 
CzmlDataSource._processCzml = function (
  czml,
  entityCollection,
  sourceUri,
  updaterFunctions,
  dataSource,
) {
  updaterFunctions = updaterFunctions ?? CzmlDataSource.updaters;
 
  if (Array.isArray(czml)) {
    for (let i = 0, len = czml.length; i < len; ++i) {
      processCzmlPacket(
        czml[i],
        entityCollection,
        updaterFunctions,
        sourceUri,
        dataSource,
      );
    }
  } else {
    processCzmlPacket(
      czml,
      entityCollection,
      updaterFunctions,
      sourceUri,
      dataSource,
    );
  }
};
export default CzmlDataSource;