    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}