001    // Copyright 2006, 2007, 2008 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.tapestry5.internal.services;
016    
017    import org.apache.tapestry5.internal.structure.Page;
018    import org.apache.tapestry5.services.ComponentEventResultProcessor;
019    
020    import java.io.IOException;
021    
022    /**
023     * Used when a component event handler returns a string value. The value is interpreted as the logical name of a page. A
024     * link to the page will be sent as a redirect.
025     */
026    public class PageNameComponentEventResultProcessor implements ComponentEventResultProcessor<String>
027    {
028        private final RequestPageCache requestPageCache;
029    
030        private final ActionRenderResponseGenerator generator;
031    
032        public PageNameComponentEventResultProcessor(RequestPageCache requestPageCache,
033                                                     ActionRenderResponseGenerator generator)
034        {
035            this.requestPageCache = requestPageCache;
036            this.generator = generator;
037        }
038    
039        public void processResultValue(String value) throws IOException
040        {
041            Page page = requestPageCache.get(value);
042    
043            generator.generateResponse(page);
044        }
045    }