goog.provide('ol.TileCache');
goog.require('ol');
goog.require('ol.TileRange');
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) {
goog.base(this);
/**
* @private
* @type {number}
*/
this.highWaterMark_ = opt_highWaterMark !== undefined ?
opt_highWaterMark : ol.DEFAULT_TILE_CACHE_HIGH_WATER_MARK;
};
goog.inherits(ol.TileCache, ol.structs.LRUCache);
/**
* @return {boolean} Can expire cache.
*/
ol.TileCache.prototype.canExpireCache = function() {
return this.getCount() > this.highWaterMark_;
};
/**
* @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();
}
}
};
/**
* Remove a tile range from the cache, e.g. to invalidate tiles.
* @param {ol.TileRange} tileRange The tile range to prune.
*/
ol.TileCache.prototype.pruneTileRange = function(tileRange) {
var i = this.getCount(),
key;
while (i--) {
key = this.peekLastKey();
if (tileRange.contains(ol.tilecoord.createFromString(key))) {
this.pop().dispose();
} else {
this.get(key);
}
}
};
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