001// Copyright 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.jpa;
016
017import org.apache.tapestry5.http.services.Request;
018import org.apache.tapestry5.internal.services.AbstractSessionPersistentFieldStrategy;
019import org.apache.tapestry5.jpa.EntityManagerManager;
020
021/**
022 * Persists JPA entities by storing their id in the session.
023 */
024public class EntityPersistentFieldStrategy extends AbstractSessionPersistentFieldStrategy
025{
026    private final EntityManagerManager entityManagerManager;
027
028    public EntityPersistentFieldStrategy(final EntityManagerManager entityManagerManager,
029            final Request request)
030    {
031        super("entity:", request);
032
033        this.entityManagerManager = entityManagerManager;
034    }
035
036    @Override
037    public Object convertApplicationValueToPersisted(final Object newValue)
038    {
039        return JpaInternalUtils.convertApplicationValueToPersisted(entityManagerManager, newValue);
040    }
041
042    @Override
043    public Object convertPersistedToApplicationValue(final Object persistedValue)
044    {
045        final PersistedEntity persisted = (PersistedEntity) persistedValue;
046
047        return persisted.restore(entityManagerManager);
048    }
049}