107 lines
2.4 KiB
JavaScript
107 lines
2.4 KiB
JavaScript
goog.provide('ol.style.IconImageCache');
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goog.require('ol.color');
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/**
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* Singleton class. Available through {@link ol.style.iconImageCache}.
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* @constructor
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*/
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ol.style.IconImageCache = function() {
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/**
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* @type {Object.<string, ol.style.IconImage>}
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* @private
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*/
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this.cache_ = {};
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/**
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* @type {number}
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* @private
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*/
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this.cacheSize_ = 0;
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/**
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* @type {number}
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* @private
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*/
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this.maxCacheSize_ = 32;
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};
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/**
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* @param {string} src Src.
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* @param {?string} crossOrigin Cross origin.
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* @param {ol.Color} color Color.
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* @return {string} Cache key.
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*/
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ol.style.IconImageCache.getKey = function(src, crossOrigin, color) {
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var colorString = color ? ol.color.asString(color) : 'null';
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return crossOrigin + ':' + src + ':' + colorString;
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};
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/**
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* FIXME empty description for jsdoc
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*/
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ol.style.IconImageCache.prototype.clear = function() {
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this.cache_ = {};
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this.cacheSize_ = 0;
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};
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/**
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* FIXME empty description for jsdoc
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*/
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ol.style.IconImageCache.prototype.expire = function() {
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if (this.cacheSize_ > this.maxCacheSize_) {
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var i = 0;
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var key, iconImage;
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for (key in this.cache_) {
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iconImage = this.cache_[key];
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if ((i++ & 3) === 0 && !iconImage.hasListener()) {
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delete this.cache_[key];
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--this.cacheSize_;
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}
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}
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}
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};
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/**
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* @param {string} src Src.
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* @param {?string} crossOrigin Cross origin.
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* @param {ol.Color} color Color.
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* @return {ol.style.IconImage} Icon image.
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*/
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ol.style.IconImageCache.prototype.get = function(src, crossOrigin, color) {
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var key = ol.style.IconImageCache.getKey(src, crossOrigin, color);
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return key in this.cache_ ? this.cache_[key] : null;
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};
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/**
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* @param {string} src Src.
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* @param {?string} crossOrigin Cross origin.
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* @param {ol.Color} color Color.
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* @param {ol.style.IconImage} iconImage Icon image.
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*/
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ol.style.IconImageCache.prototype.set = function(src, crossOrigin, color, iconImage) {
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var key = ol.style.IconImageCache.getKey(src, crossOrigin, color);
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this.cache_[key] = iconImage;
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++this.cacheSize_;
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};
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/**
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* Set the cache size of the icon cache. Default is `32`. Change this value when
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* your map uses more than 32 different icon images and you are not caching icon
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* styles on the application level.
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* @param {number} maxCacheSize Cache max size.
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* @api
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*/
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ol.style.IconImageCache.prototype.setSize = function(maxCacheSize) {
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this.maxCacheSize_ = maxCacheSize;
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this.expire();
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};
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