001// Copyright 2007, 2008, 2010, 2011, 2012 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
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.EventContext;
018import org.apache.tapestry5.SymbolConstants;
019import org.apache.tapestry5.internal.EmptyEventContext;
020import org.apache.tapestry5.ioc.annotations.Symbol;
021import org.apache.tapestry5.services.*;
022
023import 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 */
029public 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.setNonPersistentLocaleFromLocaleName(request.getLocale().toString());
065
066            handler.handlePageRender(parameters);
067
068            return true;
069        }
070
071        return false;
072    }
073
074}