com.google.gwt.user.client.impl.EventMap Maven / Gradle / Ivy
/*
* 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]);
}
}
}-*/;
}