/**
* Copyright 2008 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 org.waveprotocol.wave.client.common.util;
import com.google.gwt.core.client.JavaScriptObject;
/**
* Common type-independent methods for optimised JSO maps
*
* Designed to be subclassed, but also useful in its own right for its methods
*
* @author danilatos@google.com (Daniel Danilatos)
*/
public abstract class JsoMapBase extends JavaScriptObject {
protected JsoMapBase() {}
/**
* Removes all entries from this map.
*/
public final native void clear() /*-{
for (var key in this) {
delete this[key];
}
}-*/;
/**
* Tests whether this map is empty.
*
* @return true if this map has no entries.
*/
public final native boolean isEmpty() /*-{
for (var k in this) {
return false;
}
return true;
}-*/;
/**
* Counts the number of entries in this map. This is a time-consuming
* operation.
*/
public final native int countEntries() /*-{
var n = 0;
for (var k in this) {
n++;
}
return n;
}-*/;
}