Give ol.style.IconImageCache its own file

2016-08-09 08:56:15 -06:00
parent 274b7285f3
commit a70c6f916b
6 changed files with 106 additions and 101 deletions
@@ -0,0 +1,97 @@
+goog.provide('ol.style.IconImageCache');
+
+goog.require('ol.color');
+
+
+/**
+ * @constructor
+ * @private
+ */
+ol.style.IconImageCache = function() {
+
+  /**
+   * @type {Object.<string, ol.style.IconImage>}
+   * @private
+   */
+  this.cache_ = {};
+
+  /**
+   * @type {number}
+   * @private
+   */
+  this.cacheSize_ = 0;
+
+  /**
+   * @const
+   * @type {number}
+   * @private
+   */
+  this.maxCacheSize_ = 32;
+};
+
+
+/**
+ * @param {string} src Src.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.Color} color Color.
+ * @return {string} Cache key.
+ */
+ol.style.IconImageCache.getKey = function(src, crossOrigin, color) {
+  goog.DEBUG && console.assert(crossOrigin !== undefined,
+      'argument crossOrigin must be defined');
+  var colorString = color ? ol.color.asString(color) : 'null';
+  return crossOrigin + ':' + src + ':' + colorString;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.style.IconImageCache.prototype.clear = function() {
+  this.cache_ = {};
+  this.cacheSize_ = 0;
+};
+
+
+/**
+ * FIXME empty description for jsdoc
+ */
+ol.style.IconImageCache.prototype.expire = function() {
+  if (this.cacheSize_ > this.maxCacheSize_) {
+    var i = 0;
+    var key, iconImage;
+    for (key in this.cache_) {
+      iconImage = this.cache_[key];
+      if ((i++ & 3) === 0 && !iconImage.hasListener()) {
+        delete this.cache_[key];
+        --this.cacheSize_;
+      }
+    }
+  }
+};
+
+
+/**
+ * @param {string} src Src.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.Color} color Color.
+ * @return {ol.style.IconImage} Icon image.
+ */
+ol.style.IconImageCache.prototype.get = function(src, crossOrigin, color) {
+  var key = ol.style.IconImageCache.getKey(src, crossOrigin, color);
+  return key in this.cache_ ? this.cache_[key] : null;
+};
+
+
+/**
+ * @param {string} src Src.
+ * @param {?string} crossOrigin Cross origin.
+ * @param {ol.Color} color Color.
+ * @param {ol.style.IconImage} iconImage Icon image.
+ */
+ol.style.IconImageCache.prototype.set = function(src, crossOrigin, color,
+                                                 iconImage) {
+  var key = ol.style.IconImageCache.getKey(src, crossOrigin, color);
+  this.cache_[key] = iconImage;
+  ++this.cacheSize_;
+};