| /* |
| * Copyright 2013 Google Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); you may not |
| * use this file except in compliance with the License. You may obtain a copy of |
| * the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT |
| * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the |
| * License for the specific language governing permissions and limitations under |
| * the License. |
| */ |
| package com.google.gwt.user.client.impl; |
| |
| import com.google.gwt.core.client.JavaScriptObject; |
| |
| /** |
| * A simple helper class to abstract event maps. |
| */ |
| class EventMap extends JavaScriptObject { |
| |
| protected EventMap() { /* Mandatory constructor for JSO */} |
| |
| /** |
| * Merges the key-value pairs from the parameter into this object. If a key already exists, then |
| * it will be overridden by the new value. |
| */ |
| public final void merge(JavaScriptObject eventMap) { |
| foreach(eventMap, copyTo(this)); |
| } |
| |
| /** |
| * Returns a function that copies the passed key-value to target object. |
| */ |
| private static native JavaScriptObject copyTo(EventMap target) /*-{ |
| return function(key, value) { target[key] = value; }; |
| }-*/; |
| |
| /** |
| * Executes a provided function over the key-value pairs of the map object. |
| */ |
| static native void foreach(JavaScriptObject map, JavaScriptObject fn) /*-{ |
| for (var e in map) { |
| if (map.hasOwnProperty(e)) { |
| fn(e, map[e]); |
| } |
| } |
| }-*/; |
| } |