    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    }