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