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