001    // Copyright 2006, 2007, 2008, 2009 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.services.*;
018    
019    import java.io.IOException;
020    
021    /**
022     * Processes component action events sent as requests from the client. Component events include an event type, identify
023     * a page and a component, and may provide additional context strings.
024     *
025     * @see org.apache.tapestry5.services.ComponentEventLinkEncoder
026     */
027    public class ComponentEventDispatcher implements Dispatcher
028    {
029        private final ComponentRequestHandler componentRequestHandler;
030    
031        private final ComponentEventLinkEncoder linkEncoder;
032    
033        public ComponentEventDispatcher(ComponentRequestHandler componentRequestHandler,
034                                        ComponentEventLinkEncoder linkEncoder)
035        {
036            this.componentRequestHandler = componentRequestHandler;
037            this.linkEncoder = linkEncoder;
038        }
039    
040        public boolean dispatch(Request request, Response response) throws IOException
041        {
042            ComponentEventRequestParameters parameters = linkEncoder.decodeComponentEventRequest(request);
043    
044            if (parameters == null) return false;
045    
046            componentRequestHandler.handleComponentEvent(parameters);
047    
048            return true;
049        }
050    }