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GoogleEarthEnterpriseMapsProvider.js
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GoogleEarthEnterpriseMapsProvider.js
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define([
'../Core/buildModuleUrl',
'../Core/Check',
'../Core/Credit',
'../Core/defaultValue',
'../Core/defined',
'../Core/defineProperties',
'../Core/DeveloperError',
'../Core/Event',
'../Core/GeographicTilingScheme',
'../Core/Rectangle',
'../Core/Resource',
'../Core/RuntimeError',
'../Core/TileProviderError',
'../Core/WebMercatorTilingScheme',
'../ThirdParty/when',
'./ImageryProvider'
], function(
buildModuleUrl,
Check,
Credit,
defaultValue,
defined,
defineProperties,
DeveloperError,
Event,
GeographicTilingScheme,
Rectangle,
Resource,
RuntimeError,
TileProviderError,
WebMercatorTilingScheme,
when,
ImageryProvider) {
'use strict';
/**
* Provides tiled imagery using the Google Earth Imagery API.
*
* Notes: This imagery provider does not work with the public Google Earth servers. It works with the
* Google Earth Enterprise Server.
*
* By default the Google Earth Enterprise server does not set the
* {@link http://www.w3.org/TR/cors/|Cross-Origin Resource Sharing} headers. You can either
* use a proxy server which adds these headers, or in the /opt/google/gehttpd/conf/gehttpd.conf
* and add the 'Header set Access-Control-Allow-Origin "*"' option to the '<Directory />' and
* '<Directory "/opt/google/gehttpd/htdocs">' directives.
*
* This provider is for use with 2D Maps API as part of Google Earth Enterprise. For 3D Earth API uses, it
* is necessary to use {@link GoogleEarthEnterpriseImageryProvider}
*
* @alias GoogleEarthEnterpriseMapsProvider
* @constructor
*
* @param {Object} options Object with the following properties:
* @param {Resource|String} options.url The url of the Google Earth server hosting the imagery.
* @param {Number} options.channel The channel (id) to be used when requesting data from the server.
* The channel number can be found by looking at the json file located at:
* earth.localdomain/default_map/query?request=Json&vars=geeServerDefs The /default_map path may
* differ depending on your Google Earth Enterprise server configuration. Look for the "id" that
* is associated with a "ImageryMaps" requestType. There may be more than one id available.
* Example:
* {
* layers: [
* {
* id: 1002,
* requestType: "ImageryMaps"
* },
* {
* id: 1007,
* requestType: "VectorMapsRaster"
* }
* ]
* }
* @param {String} [options.path="/default_map"] The path of the Google Earth server hosting the imagery.
* @param {Number} [options.maximumLevel] The maximum level-of-detail supported by the Google Earth
* Enterprise server, or undefined if there is no limit.
* @param {TileDiscardPolicy} [options.tileDiscardPolicy] The policy that determines if a tile
* is invalid and should be discarded. To ensure that no tiles are discarded, construct and pass
* a {@link NeverTileDiscardPolicy} for this parameter.
* @param {Ellipsoid} [options.ellipsoid] The ellipsoid. If not specified, the WGS84 ellipsoid is used.
*
* @exception {RuntimeError} Could not find layer with channel (id) of <code>options.channel</code>.
* @exception {RuntimeError} Could not find a version in channel (id) <code>options.channel</code>.
* @exception {RuntimeError} Unsupported projection <code>data.projection</code>.
*
* @see ArcGisMapServerImageryProvider
* @see BingMapsImageryProvider
* @see createOpenStreetMapImageryProvider
* @see SingleTileImageryProvider
* @see createTileMapServiceImageryProvider
* @see WebMapServiceImageryProvider
* @see WebMapTileServiceImageryProvider
* @see UrlTemplateImageryProvider
*
*
* @example
* var google = new Cesium.GoogleEarthEnterpriseMapsProvider({
* url : 'https://earth.localdomain',
* channel : 1008
* });
*
* @see {@link http://www.w3.org/TR/cors/|Cross-Origin Resource Sharing}
*/
function GoogleEarthEnterpriseMapsProvider(options) {
options = defaultValue(options, {});
//>>includeStart('debug', pragmas.debug);
if (!defined(options.url)) {
throw new DeveloperError('options.url is required.');
}
if (!defined(options.channel)) {
throw new DeveloperError('options.channel is required.');
}
//>>includeEnd('debug');
var url = options.url;
var path = defaultValue(options.path, '/default_map');
var resource = Resource.createIfNeeded(url).getDerivedResource({
// We used to just append path to url, so now that we do proper URI resolution, removed the /
url : (path[0] === '/') ? path.substring(1) : path
});
resource.appendForwardSlash();
this._resource = resource;
this._url = url;
this._path = path;
this._tileDiscardPolicy = options.tileDiscardPolicy;
this._channel = options.channel;
this._requestType = 'ImageryMaps';
this._credit = new Credit('<a href="http://www.google.com/enterprise/mapsearth/products/earthenterprise.html"><img src="' + GoogleEarthEnterpriseMapsProvider.logoUrl + '" title="Google Imagery"/></a>');
/**
* The default {@link ImageryLayer#gamma} to use for imagery layers created for this provider.
* By default, this is set to 1.9. Changing this value after creating an {@link ImageryLayer} for this provider will have
* no effect. Instead, set the layer's {@link ImageryLayer#gamma} property.
*
* @type {Number}
* @default 1.9
*/
this.defaultGamma = 1.9;
this._tilingScheme = undefined;
this._version = undefined;
this._tileWidth = 256;
this._tileHeight = 256;
this._maximumLevel = options.maximumLevel;
this._errorEvent = new Event();
this._ready = false;
this._readyPromise = when.defer();
var metadataResource = resource.getDerivedResource({
url: 'query',
queryParameters: {
request: 'Json',
vars: 'geeServerDefs',
is2d: 't'
}
});
var that = this;
var metadataError;
function metadataSuccess(text) {
var data;
// The Google Earth server sends malformed JSON data currently...
try {
// First, try parsing it like normal in case a future version sends correctly formatted JSON
data = JSON.parse(text);
} catch (e) {
// Quote object strings manually, then try parsing again
data = JSON.parse(text.replace(/([\[\{,])[\n\r ]*([A-Za-z0-9]+)[\n\r ]*:/g, '$1"$2":'));
}
var layer;
for (var i = 0; i < data.layers.length; i++) {
if (data.layers[i].id === that._channel) {
layer = data.layers[i];
break;
}
}
var message;
if (!defined(layer)) {
message = 'Could not find layer with channel (id) of ' + that._channel + '.';
metadataError = TileProviderError.handleError(metadataError, that, that._errorEvent, message, undefined, undefined, undefined, requestMetadata);
throw new RuntimeError(message);
}
if (!defined(layer.version)) {
message = 'Could not find a version in channel (id) ' + that._channel + '.';
metadataError = TileProviderError.handleError(metadataError, that, that._errorEvent, message, undefined, undefined, undefined, requestMetadata);
throw new RuntimeError(message);
}
that._version = layer.version;
if (defined(data.projection) && data.projection === 'flat') {
that._tilingScheme = new GeographicTilingScheme({
numberOfLevelZeroTilesX : 2,
numberOfLevelZeroTilesY : 2,
rectangle : new Rectangle(-Math.PI, -Math.PI, Math.PI, Math.PI),
ellipsoid : options.ellipsoid
});
// Default to mercator projection when projection is undefined
} else if (!defined(data.projection) || data.projection === 'mercator') {
that._tilingScheme = new WebMercatorTilingScheme({
numberOfLevelZeroTilesX : 2,
numberOfLevelZeroTilesY : 2,
ellipsoid : options.ellipsoid
});
} else {
message = 'Unsupported projection ' + data.projection + '.';
metadataError = TileProviderError.handleError(metadataError, that, that._errorEvent, message, undefined, undefined, undefined, requestMetadata);
throw new RuntimeError(message);
}
that._ready = true;
that._readyPromise.resolve(true);
TileProviderError.handleSuccess(metadataError);
}
function metadataFailure(e) {
var message = 'An error occurred while accessing ' + metadataResource.url + '.';
metadataError = TileProviderError.handleError(metadataError, that, that._errorEvent, message, undefined, undefined, undefined, requestMetadata);
that._readyPromise.reject(new RuntimeError(message));
}
function requestMetadata() {
var metadata = metadataResource.fetchText();
when(metadata, metadataSuccess, metadataFailure);
}
requestMetadata();
}
defineProperties(GoogleEarthEnterpriseMapsProvider.prototype, {
/**
* Gets the URL of the Google Earth MapServer.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {String}
* @readonly
*/
url : {
get : function() {
return this._url;
}
},
/**
* Gets the url path of the data on the Google Earth server.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {String}
* @readonly
*/
path : {
get : function() {
return this._path;
}
},
/**
* Gets the proxy used by this provider.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Proxy}
* @readonly
*/
proxy : {
get : function() {
return this._resource.proxy;
}
},
/**
* Gets the imagery channel (id) currently being used.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Number}
* @readonly
*/
channel : {
get : function() {
return this._channel;
}
},
/**
* Gets the width of each tile, in pixels. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Number}
* @readonly
*/
tileWidth : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('tileWidth must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._tileWidth;
}
},
/**
* Gets the height of each tile, in pixels. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Number}
* @readonly
*/
tileHeight : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('tileHeight must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._tileHeight;
}
},
/**
* Gets the maximum level-of-detail that can be requested. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Number}
* @readonly
*/
maximumLevel : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('maximumLevel must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._maximumLevel;
}
},
/**
* Gets the minimum level-of-detail that can be requested. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Number}
* @readonly
*/
minimumLevel : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('minimumLevel must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return 0;
}
},
/**
* Gets the tiling scheme used by this provider. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {TilingScheme}
* @readonly
*/
tilingScheme : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('tilingScheme must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._tilingScheme;
}
},
/**
* Gets the version of the data used by this provider. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Number}
* @readonly
*/
version : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('version must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._version;
}
},
/**
* Gets the type of data that is being requested from the provider. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {String}
* @readonly
*/
requestType : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('requestType must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._requestType;
}
},
/**
* Gets the rectangle, in radians, of the imagery provided by this instance. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Rectangle}
* @readonly
*/
rectangle : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('rectangle must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._tilingScheme.rectangle;
}
},
/**
* Gets the tile discard policy. If not undefined, the discard policy is responsible
* for filtering out "missing" tiles via its shouldDiscardImage function. If this function
* returns undefined, no tiles are filtered. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {TileDiscardPolicy}
* @readonly
*/
tileDiscardPolicy : {
get : function() {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('tileDiscardPolicy must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
return this._tileDiscardPolicy;
}
},
/**
* Gets an event that is raised when the imagery provider encounters an asynchronous error. By subscribing
* to the event, you will be notified of the error and can potentially recover from it. Event listeners
* are passed an instance of {@link TileProviderError}.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Event}
* @readonly
*/
errorEvent : {
get : function() {
return this._errorEvent;
}
},
/**
* Gets a value indicating whether or not the provider is ready for use.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Boolean}
* @readonly
*/
ready : {
get : function() {
return this._ready;
}
},
/**
* Gets a promise that resolves to true when the provider is ready for use.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Promise.<Boolean>}
* @readonly
*/
readyPromise : {
get : function() {
return this._readyPromise.promise;
}
},
/**
* Gets the credit to display when this imagery provider is active. Typically this is used to credit
* the source of the imagery. This function should not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Credit}
* @readonly
*/
credit : {
get : function() {
return this._credit;
}
},
/**
* Gets a value indicating whether or not the images provided by this imagery provider
* include an alpha channel. If this property is false, an alpha channel, if present, will
* be ignored. If this property is true, any images without an alpha channel will be treated
* as if their alpha is 1.0 everywhere. When this property is false, memory usage
* and texture upload time are reduced.
* @memberof GoogleEarthEnterpriseMapsProvider.prototype
* @type {Boolean}
* @readonly
*/
hasAlphaChannel : {
get : function() {
return true;
}
}
});
/**
* Gets the credits to be displayed when a given tile is displayed.
*
* @param {Number} x The tile X coordinate.
* @param {Number} y The tile Y coordinate.
* @param {Number} level The tile level;
* @returns {Credit[]} The credits to be displayed when the tile is displayed.
*
* @exception {DeveloperError} <code>getTileCredits</code> must not be called before the imagery provider is ready.
*/
GoogleEarthEnterpriseMapsProvider.prototype.getTileCredits = function(x, y, level) {
return undefined;
};
/**
* Requests the image for a given tile. This function should
* not be called before {@link GoogleEarthEnterpriseMapsProvider#ready} returns true.
*
* @param {Number} x The tile X coordinate.
* @param {Number} y The tile Y coordinate.
* @param {Number} level The tile level.
* @param {Request} [request] The request object. Intended for internal use only.
* @returns {Promise.<Image|Canvas>|undefined} A promise for the image that will resolve when the image is available, or
* undefined if there are too many active requests to the server, and the request
* should be retried later. The resolved image may be either an
* Image or a Canvas DOM object.
*
* @exception {DeveloperError} <code>requestImage</code> must not be called before the imagery provider is ready.
*/
GoogleEarthEnterpriseMapsProvider.prototype.requestImage = function(x, y, level, request) {
//>>includeStart('debug', pragmas.debug);
if (!this._ready) {
throw new DeveloperError('requestImage must not be called before the imagery provider is ready.');
}
//>>includeEnd('debug');
var resource = this._resource.getDerivedResource({
url: 'query',
request: request,
queryParameters: {
request: this._requestType,
channel: this._channel,
version: this._version,
x: x,
y: y,
z: level + 1 // Google Earth starts with a zoom level of 1, not 0
}
});
return ImageryProvider.loadImage(this, resource);
};
/**
* Picking features is not currently supported by this imagery provider, so this function simply returns
* undefined.
*
* @param {Number} x The tile X coordinate.
* @param {Number} y The tile Y coordinate.
* @param {Number} level The tile level.
* @param {Number} longitude The longitude at which to pick features.
* @param {Number} latitude The latitude at which to pick features.
* @return {Promise.<ImageryLayerFeatureInfo[]>|undefined} A promise for the picked features that will resolve when the asynchronous
* picking completes. The resolved value is an array of {@link ImageryLayerFeatureInfo}
* instances. The array may be empty if no features are found at the given location.
* It may also be undefined if picking is not supported.
*/
GoogleEarthEnterpriseMapsProvider.prototype.pickFeatures = function(x, y, level, longitude, latitude) {
return undefined;
};
GoogleEarthEnterpriseMapsProvider._logoUrl = undefined;
defineProperties(GoogleEarthEnterpriseMapsProvider, {
/**
* Gets or sets the URL to the Google Earth logo for display in the credit.
* @memberof GoogleEarthEnterpriseMapsProvider
* @type {String}
*/
logoUrl: {
get: function() {
if (!defined(GoogleEarthEnterpriseMapsProvider._logoUrl)) {
GoogleEarthEnterpriseMapsProvider._logoUrl = buildModuleUrl('Assets/Images/google_earth_credit.png');
}
return GoogleEarthEnterpriseMapsProvider._logoUrl;
},
set: function(value) {
//>>includeStart('debug', pragmas.debug);
Check.defined('value', value);
//>>includeEnd('debug');
GoogleEarthEnterpriseMapsProvider._logoUrl = value;
}
}
});
return GoogleEarthEnterpriseMapsProvider;
});