/*
* Copyright 2010 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.web.bindery.requestfactory.gwt.ui.client;
import com.google.gwt.view.client.ProvidesKey;
import com.google.web.bindery.requestfactory.shared.EntityProxy;
/**
* An {@link EntityProxy}-aware key provider, handy for use with
* {@link com.google.gwt.view.client.SelectionModel} and various cell widgets.
*
* @see com.google.gwt.user.cellview.client.CellBrowser
* @see com.google.gwt.user.cellview.client.CellList
* @see com.google.gwt.user.cellview.client.CellTable
*
* @param <P> the proxy type
*/
public class EntityProxyKeyProvider<P extends EntityProxy> implements ProvidesKey<P> {
/**
* Returns the key Object for the given item.
*
* @param item an item of type P
*/
public Object getKey(P item) {
return item == null ? null : item.stableId();
}
}