    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.internal.services.AbstractSessionPersistentFieldStrategy;
    018import org.apache.tapestry5.jpa.EntityManagerManager;
    019import org.apache.tapestry5.services.Request;
    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    protected Object convertApplicationValueToPersisted(final Object newValue)
    038    {
    039        return JpaInternalUtils.convertApplicationValueToPersisted(entityManagerManager, newValue);
    040    }
    041
    042    @Override
    043    protected Object convertPersistedToApplicationValue(final Object persistedValue)
    044    {
    045        final PersistedEntity persisted = (PersistedEntity) persistedValue;
    046
    047        return persisted.restore(entityManagerManager);
    048    }
    049}