Imports cased like the filename

src/ol/TileCache.js

@@ -0,0 +1,55 @@
+goog.provide('ol.TileCache');
+
+goog.require('ol');
+goog.require('ol.structs.LRUCache');
+goog.require('ol.tilecoord');
+
+
+/**
+ * @constructor
+ * @extends {ol.structs.LRUCache.<ol.Tile>}
+ * @param {number=} opt_highWaterMark High water mark.
+ * @struct
+ */
+ol.TileCache = function(opt_highWaterMark) {
+
+  ol.structs.LRUCache.call(this, opt_highWaterMark);
+
+};
+ol.inherits(ol.TileCache, ol.structs.LRUCache);
+
+
+/**
+ * @param {Object.<string, ol.TileRange>} usedTiles Used tiles.
+ */
+ol.TileCache.prototype.expireCache = function(usedTiles) {
+  var tile, zKey;
+  while (this.canExpireCache()) {
+    tile = this.peekLast();
+    zKey = tile.tileCoord[0].toString();
+    if (zKey in usedTiles && usedTiles[zKey].contains(tile.tileCoord)) {
+      break;
+    } else {
+      this.pop().dispose();
+    }
+  }
+};
+
+
+/**
+ * Prune all tiles from the cache that don't have the same z as the newest tile.
+ */
+ol.TileCache.prototype.pruneExceptNewestZ = function() {
+  if (this.getCount() === 0) {
+    return;
+  }
+  var key = this.peekFirstKey();
+  var tileCoord = ol.tilecoord.fromKey(key);
+  var z = tileCoord[0];
+  this.forEach(function(tile) {
+    if (tile.tileCoord[0] !== z) {
+      this.remove(ol.tilecoord.getKey(tile.tileCoord));
+      tile.dispose();
+    }
+  }, this);
+};