    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
    015    package org.apache.tapestry5.internal.jpa;
    016
    017    import org.apache.tapestry5.internal.services.AbstractSessionPersistentFieldStrategy;
    018    import org.apache.tapestry5.jpa.EntityManagerManager;
    019    import org.apache.tapestry5.services.Request;
    020
    021    /**
    022     * Persists JPA entities by storing their id in the session.
    023     */
    024    public 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    }