001    /*
002     * Copyright 2006 Google Inc.
003     * 
004     * Licensed under the Apache License, Version 2.0 (the "License"); you may not
005     * use this file except in compliance with the License. You may obtain a copy of
006     * the License at
007     * 
008     * http://www.apache.org/licenses/LICENSE-2.0
009     * 
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
012     * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
013     * License for the specific language governing permissions and limitations under
014     * the License.
015     */
016    package com.google.gwt.user.client.impl;
017    
018    import com.google.gwt.user.client.History;
019    
020    /**
021     * Native implementation associated with
022     * {@link com.google.gwt.user.client.History}.
023     */
024    public abstract class HistoryImpl {
025    
026      public abstract boolean init();
027      public abstract String getToken();
028      public abstract void newItem(String historyToken);
029    
030      protected static void onHistoryChanged(String historyToken) {
031        History.onHistoryChanged(historyToken);
032      }
033    }