001    // Copyright 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.ComponentClassResolver;
019    import org.apache.tapestry5.services.ComponentEventResultProcessor;
020    
021    import java.io.IOException;
022    
023    /**
024     * Used when a component event handler returns a class value. The value is interpreted as the page class. A link to the
025     * page will be sent.
026     */
027    public class ClassResultProcessor implements ComponentEventResultProcessor<Class>
028    {
029        private final ComponentClassResolver resolver;
030    
031        private final RequestPageCache requestPageCache;
032    
033        private final ActionRenderResponseGenerator generator;
034    
035        public ClassResultProcessor(ComponentClassResolver resolver, RequestPageCache requestPageCache,
036                                    ActionRenderResponseGenerator generator)
037        {
038            this.resolver = resolver;
039            this.requestPageCache = requestPageCache;
040            this.generator = generator;
041        }
042    
043        public void processResultValue(Class value) throws IOException
044        {
045            String className = value.getName();
046            String pageName = resolver.resolvePageClassNameToPageName(className);
047    
048            Page page = requestPageCache.get(pageName);
049    
050            generator.generateResponse(page);
051        }
052    
053    }