    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}