    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.beanmodel.services.*;
    020import org.apache.tapestry5.http.services.Dispatcher;
    021import org.apache.tapestry5.http.services.Request;
    022import org.apache.tapestry5.http.services.Response;
    023import org.apache.tapestry5.internal.EmptyEventContext;
    024import org.apache.tapestry5.ioc.annotations.Symbol;
    025import org.apache.tapestry5.services.ComponentClassResolver;
    026import org.apache.tapestry5.services.ComponentRequestHandler;
    027import org.apache.tapestry5.services.LocalizationSetter;
    028import org.apache.tapestry5.services.PageRenderRequestParameters;
    029
    030import java.io.IOException;
    031
    032/**
    033 * Recognizes a request for the application root (i.e., "/") and handles this the same as a render request for the
    034 * "Start" page. Support for the Start page is kept for legacy purposes, Index pages are the correct approach.
    035 */
    036public class RootPathDispatcher implements Dispatcher
    037{
    038    private static final EventContext EMPTY_CONTEXT = new EmptyEventContext();
    039
    040    private final ComponentClassResolver componentClassResolver;
    041
    042    private final ComponentRequestHandler handler;
    043
    044    private final String startPageName;
    045
    046    private final PageRenderRequestParameters parameters;
    047
    048    private final LocalizationSetter localizationSetter;
    049
    050    public RootPathDispatcher(ComponentClassResolver componentClassResolver,
    051
    052                              ComponentRequestHandler handler,
    053
    054                              @Symbol(SymbolConstants.START_PAGE_NAME)
    055                              String startPageName, LocalizationSetter localizationSetter)
    056    {
    057        this.componentClassResolver = componentClassResolver;
    058        this.handler = handler;
    059        this.startPageName = startPageName;
    060        this.localizationSetter = localizationSetter;
    061
    062        parameters = new PageRenderRequestParameters(this.startPageName, EMPTY_CONTEXT, false);
    063    }
    064
    065    public boolean dispatch(Request request, final Response response) throws IOException
    066    {
    067        // Only match the root path
    068
    069        if (request.getPath().equals("/") && componentClassResolver.isPageName(startPageName))
    070        {
    071            localizationSetter.setNonPersistentLocaleFromLocaleName(request.getLocale().toString());
    072
    073            handler.handlePageRender(parameters);
    074
    075            return true;
    076        }
    077
    078        return false;
    079    }
    080
    081}