102 lines
2.2 KiB
JavaScript
102 lines
2.2 KiB
JavaScript
goog.provide('ol3.TileStore');
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goog.require('ol3.Attribution');
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goog.require('ol3.Store');
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goog.require('ol3.Tile');
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goog.require('ol3.TileCoord');
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goog.require('ol3.TileGrid');
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goog.require('ol3.TileUrlFunctionType');
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/**
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* @constructor
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* @extends {ol3.Store}
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* @param {ol3.Projection} projection Projection.
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* @param {ol3.TileGrid} tileGrid Tile grid.
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* @param {ol3.TileUrlFunctionType} tileUrlFunction Tile URL.
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* @param {ol3.Extent=} opt_extent Extent.
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* @param {Array.<string>=} opt_attributions Attributions.
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* @param {?string=} opt_crossOrigin Cross origin.
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*/
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ol3.TileStore = function(projection, tileGrid, tileUrlFunction, opt_extent,
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opt_attributions, opt_crossOrigin) {
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goog.base(this, projection, opt_extent, opt_attributions);
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/**
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* @protected
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* @type {ol3.TileGrid}
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*/
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this.tileGrid = tileGrid;
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/**
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* @protected
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* @type {ol3.TileUrlFunctionType}
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*/
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this.tileUrlFunction = tileUrlFunction;
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/**
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* @private
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* @type {?string}
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*/
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this.crossOrigin_ = opt_crossOrigin || 'anonymous';
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/**
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* @private
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* @type {Object.<string, ol3.Tile>}
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* FIXME will need to expire elements from this cache
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* FIXME see elemoine's work with goog.structs.LinkedMap
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*/
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this.tileCache_ = {};
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};
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goog.inherits(ol3.TileStore, ol3.Store);
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/**
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* @inheritDoc
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*/
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ol3.TileStore.prototype.getResolutions = function() {
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return this.tileGrid.getResolutions();
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};
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/**
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* @param {ol3.TileCoord} tileCoord Tile coordinate.
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* @return {ol3.Tile} Tile.
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*/
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ol3.TileStore.prototype.getTile = function(tileCoord) {
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var key = tileCoord.toString();
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if (goog.object.containsKey(this.tileCache_, key)) {
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return this.tileCache_[key];
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} else {
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var tileUrl = this.getTileCoordUrl(tileCoord);
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var tile;
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if (goog.isDef(tileUrl)) {
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tile = new ol3.Tile(tileCoord, tileUrl, this.crossOrigin_);
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} else {
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tile = null;
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}
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this.tileCache_[key] = tile;
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return tile;
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}
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};
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/**
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* @param {ol3.TileCoord} tileCoord Tile coordinate.
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* @return {string|undefined} Tile URL.
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*/
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ol3.TileStore.prototype.getTileCoordUrl = function(tileCoord) {
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return this.tileUrlFunction(tileCoord);
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};
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/**
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* @return {ol3.TileGrid} Tile grid.
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*/
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ol3.TileStore.prototype.getTileGrid = function() {
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return this.tileGrid;
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};
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