    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.transform.ReadOnlyComponentFieldConduit;
    018import org.apache.tapestry5.jpa.EntityManagerManager;
    019import org.apache.tapestry5.model.MutableComponentModel;
    020import org.apache.tapestry5.plastic.InstanceContext;
    021import org.apache.tapestry5.plastic.PlasticClass;
    022import org.apache.tapestry5.plastic.PlasticField;
    023import org.apache.tapestry5.services.transform.ComponentClassTransformWorker2;
    024import org.apache.tapestry5.services.transform.TransformationSupport;
    025
    026import javax.persistence.PersistenceContext;
    027
    028public class PersistenceContextWorker implements ComponentClassTransformWorker2
    029{
    030    private final EntityManagerManager entityManagerManager;
    031
    032    public PersistenceContextWorker(final EntityManagerManager entityManagerManager)
    033    {
    034        this.entityManagerManager = entityManagerManager;
    035    }
    036
    037    @Override
    038    public void transform(PlasticClass plasticClass, TransformationSupport support, MutableComponentModel model)
    039    {
    040        for (final PlasticField field : plasticClass
    041                .getFieldsWithAnnotation(PersistenceContext.class))
    042        {
    043            final PersistenceContext annotation = field.getAnnotation(PersistenceContext.class);
    044
    045            field.claim(annotation);
    046
    047            field.setConduit(new ReadOnlyComponentFieldConduit(plasticClass.getClassName(), field.getName())
    048            {
    049                @Override
    050                public Object get(Object instance, InstanceContext context)
    051                {
    052                    return JpaInternalUtils.getEntityManager(entityManagerManager, annotation);
    053                }
    054            });
    055        }
    056    }
    057}