001// Copyright 2007, 2008, 2009, 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
015package org.apache.tapestry5.internal.services;
016
017import org.apache.tapestry5.beanmodel.services.*;
018import org.apache.tapestry5.http.Link;
019import org.apache.tapestry5.services.ComponentEventRequestParameters;
020import org.apache.tapestry5.services.LinkCreationListener2;
021import org.apache.tapestry5.services.PageRenderRequestParameters;
022import org.apache.tapestry5.services.PersistentFieldChange;
023import org.apache.tapestry5.services.PersistentFieldStrategy;
024
025import java.util.Collection;
026
027/**
028 * Implements simple client-persistent properties. Most of the logic is delegated to an instance of {@link
029 * ClientPersistentFieldStorage}. This division of layer allows this service to be a true singleton, and a listener to
030 * the {@link LinkSource}, and allow per-request state to be isolated inside the other service.
031 */
032public class ClientPersistentFieldStrategy implements PersistentFieldStrategy, LinkCreationListener2
033{
034    private final ClientPersistentFieldStorage storage;
035
036    public ClientPersistentFieldStrategy(ClientPersistentFieldStorage storage)
037    {
038        this.storage = storage;
039    }
040
041    public Collection<PersistentFieldChange> gatherFieldChanges(String pageName)
042    {
043        return storage.gatherFieldChanges(pageName);
044    }
045
046    public void postChange(String pageName, String componentId, String fieldName, Object newValue)
047    {
048        storage.postChange(pageName, componentId, fieldName, newValue);
049    }
050
051    public void createdComponentEventLink(Link link, ComponentEventRequestParameters parameters)
052    {
053        storage.updateLink(link);
054    }
055
056    public void createdPageRenderLink(Link link, PageRenderRequestParameters parameters)
057    {
058        storage.updateLink(link);
059    }
060
061    public void discardChanges(String pageName)
062    {
063        storage.discardChanges(pageName);
064    }
065}