    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}