    001    // Copyright 2008 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.hibernate;
    016
    017    import org.apache.tapestry5.internal.services.AbstractSessionPersistentFieldStrategy;
    018    import org.apache.tapestry5.services.Request;
    019    import org.hibernate.HibernateException;
    020    import org.hibernate.Session;
    021
    022    import java.io.Serializable;
    023
    024    /**
    025     * Persists Hibernate entities by storing their id in the session.
    026     *
    027     * @see org.apache.tapestry5.internal.hibernate.PersistedEntity
    028     */
    029    public class EntityPersistentFieldStrategy extends AbstractSessionPersistentFieldStrategy
    030    {
    031        private final Session session;
    032
    033        public EntityPersistentFieldStrategy(Session session, Request request)
    034        {
    035            super("entity:", request);
    036
    037            this.session = session;
    038        }
    039
    040        @Override
    041        protected Object convertApplicationValueToPersisted(Object newValue)
    042        {
    043            try
    044            {
    045                String entityName = session.getEntityName(newValue);
    046                Serializable id = session.getIdentifier(newValue);
    047
    048                return new PersistedEntity(entityName, id);
    049            }
    050            catch (HibernateException ex)
    051            {
    052                throw new IllegalArgumentException(HibernateMessages.entityNotAttached(newValue), ex);
    053            }
    054        }
    055
    056        @Override
    057        protected Object convertPersistedToApplicationValue(Object persistedValue)
    058        {
    059            PersistedEntity persisted = (PersistedEntity) persistedValue;
    060
    061            return persisted.restore(session);
    062        }
    063    }