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gaia/tests/jsmarionette/plugins/marionette-apps/lib/scripts/objectcache.js

@@ -0,0 +1,64 @@
+(function() {
+  'use strict';
+
+  if (window.wrappedJSObject.ObjectCache !== undefined) {
+    // Don't redefine ObjectCache!
+    return;
+  }
+
+  /**
+   * @constructor
+   */
+  function ObjectCache() {
+  }
+
+
+  ObjectCache.prototype = {
+    /**
+     * Find the gecko object that corresponds to some node object.
+     * @param {string} key Some id.
+     */
+    get: function(key) {
+      return this._cache[key];
+    },
+
+
+    /**
+     * Add some gecko object to the client's object cache.
+     * @param {Object} obj Gecko object.
+     * @param {string} opt_key Optional key to store obj on.
+     * @return {string} The key that we end up storing obj on.
+     */
+    set: function(obj, opt_key) {
+      var key = opt_key || this.getNextId();
+      this._cache[key] = obj;
+      return key;
+    },
+
+
+    /**
+     * Generate a new, unique id.
+     * @return {string}
+     */
+    getNextId: function() {
+      this._nextId += 1;
+      return this._nextId.toString();
+    },
+
+
+    /**
+     * Map from id to gecko objects.
+     * @type {Object<string, Object>}
+     */
+    _cache: {},
+
+
+    /**
+     * @type {number} Count of number of ids we've generated.
+     */
+    _nextId: 0
+  };
+
+  ObjectCache._inst = new ObjectCache();
+  window.wrappedJSObject.ObjectCache = ObjectCache;
+})();