001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.tapestry.junit.mock.app;
016    
017    import org.apache.tapestry.IRequestCycle;
018    import org.apache.tapestry.callback.ICallback;
019    import org.apache.tapestry.html.BasePage;
020    
021    /**
022     * Guard page for the Protected page. Protected checks the "visited" property of this page and, if
023     * false, redirects to this page.
024     * 
025     * @author Howard Lewis Ship
026     * @since 2.3
027     */
028    
029    public abstract class Guard extends BasePage
030    {
031        public abstract ICallback getCallback();
032    
033        public abstract void setCallback(ICallback callback);
034    
035        public abstract void setVisited(boolean visited);
036    
037        public abstract boolean isVisited();
038    
039        public void linkClicked(IRequestCycle cycle)
040        {
041            setVisited(true);
042    
043            ICallback callback = getCallback();
044    
045            setCallback(null);
046    
047            callback.performCallback(cycle);
048        }
049    
050    }