// Copyright 2011 The Apache Software Foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package org.apache.tapestry5.internal.jpa;
import javax.persistence.PersistenceContext;
import org.apache.tapestry5.ioc.services.FieldValueConduit;
import org.apache.tapestry5.jpa.EntityManagerManager;
import org.apache.tapestry5.model.MutableComponentModel;
import org.apache.tapestry5.services.ClassTransformation;
import org.apache.tapestry5.services.ComponentClassTransformWorker;
import org.apache.tapestry5.services.TransformField;
public class PersistenceContextWorker implements ComponentClassTransformWorker
{
private final EntityManagerManager entityManagerManager;
public PersistenceContextWorker(final EntityManagerManager entityManagerManager)
{
super();
this.entityManagerManager = entityManagerManager;
}
/**
* {@inheritDoc}
*/
public void transform(final ClassTransformation transformation,
final MutableComponentModel model)
{
for (final TransformField field : transformation
.matchFieldsWithAnnotation(PersistenceContext.class))
{
final PersistenceContext annotation = field.getAnnotation(PersistenceContext.class);
field.claim(annotation);
field.replaceAccess(new FieldValueConduit()
{
public Object get()
{
return JpaInternalUtils.getEntityManager(entityManagerManager, annotation);
}
public void set(final Object newValue)
{
throw new UnsupportedOperationException(String.format(
"It is not possible to assign a new value to '%s' field",
field.getName()));
}
});
}
}
}