Local caching

gistfile1.js

_loadTile: function (tile, tilePoint) {
		
		//try{
			var that = this;
		
			tile._layer = this;
			tile.onload = this._tileOnLoad;
			tile.onerror = this._tileOnError;
			
			tilePoint.z = this._getZoomForUrl();
		
			if (!this.tileStore) {
				//console.log("Getting from web");
				tile.src = this.getTileUrl(tilePoint);
				return;
			}
						
			var sFileName = this._getFilePath({ x: tilePoint.x, y: tilePoint.y, z: tilePoint.z });
			//console.log("fileName " + sFileName);
			this.tileStore.getFile(
				sFileName,
				null,
				function (oFile) {
					//console.log("Tile loaded from cache ");
					tile.src = oFile.toURL();
						
				},
				function (oError) {
					//console.log("Cached tile not found, fetching it ...");
					try{
						if (!that.canCache(tilePoint)) {
							//console.log('cancache: No');
							tile.src = that.getTileUrl(tilePoint);
							return;
						}
					} catch (ex) { console.error("err qwe : " + ex + " \n" + JSON.stringify(ex)); }
					//console.log('no local tile');
					that._downloadTile(
						{ x: tilePoint.x, y: tilePoint.y, z: tilePoint.z },
						function (oResult) {
							//console.log('download done.');
							if (oResult.status == "success") {
								tile.src = oResult.data.toURL();
								//console.log("loaded from new cache" );
							}
						}
					);
						
				}
			);
		
		//} catch (ex) { console.log("err abc: " + ex + " \n" + JSON.stringify(ex)); }
	},