    001    // Copyright 2007, 2008, 2010, 2011 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.EventContext;
    018    import org.apache.tapestry5.SymbolConstants;
    019    import org.apache.tapestry5.internal.EmptyEventContext;
    020    import org.apache.tapestry5.ioc.annotations.Symbol;
    021    import org.apache.tapestry5.services.*;
    022
    023    import java.io.IOException;
    024
    025    /**
    026     * Recognizes a request for the application root (i.e., "/") and handles this the same as a render request for the
    027     * "Start" page. Support for the Start page is kept for legacy purposes, Index pages are the correct approach.
    028     */
    029    public class RootPathDispatcher implements Dispatcher
    030    {
    031        private static final EventContext EMPTY_CONTEXT = new EmptyEventContext();
    032
    033        private final ComponentClassResolver componentClassResolver;
    034
    035        private final ComponentRequestHandler handler;
    036
    037        private final String startPageName;
    038
    039        private final PageRenderRequestParameters parameters;
    040
    041        private final LocalizationSetter localizationSetter;
    042
    043        public RootPathDispatcher(ComponentClassResolver componentClassResolver,
    044
    045                                  ComponentRequestHandler handler,
    046
    047                                  @Symbol(SymbolConstants.START_PAGE_NAME)
    048                                  String startPageName, LocalizationSetter localizationSetter)
    049        {
    050            this.componentClassResolver = componentClassResolver;
    051            this.handler = handler;
    052            this.startPageName = startPageName;
    053            this.localizationSetter = localizationSetter;
    054
    055            parameters = new PageRenderRequestParameters(this.startPageName, EMPTY_CONTEXT, false);
    056        }
    057
    058        public boolean dispatch(Request request, final Response response) throws IOException
    059        {
    060            // Only match the root path
    061
    062            if (request.getPath().equals("/") && componentClassResolver.isPageName(startPageName))
    063            {
    064                localizationSetter.setNonPeristentLocaleFromLocaleName(request.getLocale().toString());
    065
    066                handler.handlePageRender(parameters);
    067
    068                return true;
    069            }
    070
    071            return false;
    072        }
    073
    074    }