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51 lines
1.0 KiB
51 lines
1.0 KiB
/**
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* @module ol/TileCache
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*/
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import LRUCache from './structs/LRUCache.js';
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import {fromKey, getKey} from './tilecoord.js';
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class TileCache extends LRUCache {
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clear() {
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while (this.getCount() > 0) {
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this.pop().release();
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}
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super.clear();
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}
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/**
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* @param {!Object<string, boolean>} usedTiles Used tiles.
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*/
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expireCache(usedTiles) {
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while (this.canExpireCache()) {
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const tile = this.peekLast();
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if (tile.getKey() in usedTiles) {
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break;
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} else {
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this.pop().release();
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}
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}
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}
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/**
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* Prune all tiles from the cache that don't have the same z as the newest tile.
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*/
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pruneExceptNewestZ() {
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if (this.getCount() === 0) {
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return;
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}
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const key = this.peekFirstKey();
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const tileCoord = fromKey(key);
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const z = tileCoord[0];
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this.forEach(
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function (tile) {
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if (tile.tileCoord[0] !== z) {
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this.remove(getKey(tile.tileCoord));
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tile.release();
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}
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}.bind(this)
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);
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}
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}
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export default TileCache;
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