/*
* Copyright 2010 Daniel Kurka
*
* 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.googlecode.mgwt.collection.client;
import com.google.gwt.core.client.JavaScriptObject;
import com.googlecode.mgwt.collection.shared.LightArray;
import com.googlecode.mgwt.collection.shared.LightMap;
/**
* An implementation of {@link LightMap} that uses native javascript objects as dictionaries
*
* @author Daniel Kurka
*
* @param <V> the tyope of object to store
*/
public class JsLightMap<V> implements LightMap<V> {
private JavaScriptObject map;
/**
* Construct a {@link JsLightMap}
*/
public JsLightMap() {
this(JavaScriptObject.createObject());
}
/**
* Construct a {@link JsLightMap} using a given javascript object
*
* @param data the javascript object to use
*/
public JsLightMap(JavaScriptObject data) {
if (data == null) {
throw new IllegalArgumentException("data must not be null");
}
this.map = data;
}
@Override
public final void clear() {
clearData();
}
private final native void clearData() /*-{
this.@com.googlecode.mgwt.collection.client.JsLightMap::map = {};
}-*/;
@Override
public final native boolean containsKey(String key) /*-{
return (this.@com.googlecode.mgwt.collection.client.JsLightMap::map)[key] != null;
}-*/;
@Override
public void remove(String key) {
nativeDelete(key);
}
private native V nativeDelete(String key) /*-{
delete (this.@com.googlecode.mgwt.collection.client.JsLightMap::map)[key];
}-*/;
@Override
public V get(String key) {
return nativeGet(key);
}
private native V nativeGet(String key) /*-{
return (this.@com.googlecode.mgwt.collection.client.JsLightMap::map)[key];
}-*/;
@Override
public void put(String key, V value) {
nativePut(key, value);
}
private native V nativePut(String key, V value) /*-{
(this.@com.googlecode.mgwt.collection.client.JsLightMap::map)[key] = value;
}-*/;
@Override
public LightArray<String> getKeys() {
JavaScriptObject array = getNativeKeyArray();
return new JsLightArray<String>(array);
}
private native JavaScriptObject getNativeKeyArray()/*-{
var array = [];
for ( var key in this.@com.googlecode.mgwt.collection.client.JsLightMap::map) {
array.push(key);
}
return array;
}-*/;
/**
* get the underlying javascript object
*
* @return the underlying javascript object
*/
public JavaScriptObject getMap() {
return map;
}
}