    001// Copyright 2008-2014 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.hibernate.web.internal;
    016
    017import org.apache.tapestry5.http.services.Request;
    018import org.apache.tapestry5.internal.services.AbstractSessionPersistentFieldStrategy;
    019import org.hibernate.HibernateException;
    020import org.hibernate.Session;
    021
    022import java.io.Serializable;
    023
    024/**
    025 * Persists Hibernate entities by storing their id in the session.
    026 *
    027 * @see org.apache.tapestry5.hibernate.web.internal.PersistedEntity
    028 */
    029public 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    public Object convertApplicationValueToPersisted(Object newValue)
    042    {
    043        assert newValue != null;
    044
    045        if (!session.contains(newValue))
    046        {
    047            return new PersistedTransientEntity(newValue);
    048        }
    049
    050        try
    051        {
    052            String entityName = session.getEntityName(newValue);
    053            Serializable id = session.getIdentifier(newValue);
    054
    055            return new PersistedEntity(entityName, id);
    056        } catch (HibernateException ex)
    057        {
    058            throw new IllegalArgumentException(String.format("Failed persisting an entity in the session. entity: %s", newValue), ex);
    059        }
    060    }
    061
    062    @Override
    063    public Object convertPersistedToApplicationValue(Object persistedValue)
    064    {
    065        assert persistedValue != null;
    066
    067        SessionRestorable persisted = (SessionRestorable) persistedValue;
    068
    069        return persisted.restoreWithSession(session);
    070    }
    071}