org.apache.tapestry5.internal.jpa.PersistedEntity Maven / Gradle / Ivy
// 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 java.io.Serializable;
import javax.persistence.EntityManager;
import org.apache.tapestry5.annotations.ImmutableSessionPersistedObject;
import org.apache.tapestry5.jpa.EntityManagerManager;
/**
* Encapsulates a JPA entity name with an entity id.
*/
@ImmutableSessionPersistedObject
public class PersistedEntity implements Serializable
{
private static final long serialVersionUID = 897120520279686518L;
private final Class entityClass;
private final Object id;
private final String persistenceUnitName;
public PersistedEntity(final Class entityClass, final Object id,
final String persistenceUnitName)
{
this.entityClass = entityClass;
this.id = id;
this.persistenceUnitName = persistenceUnitName;
}
public Object restore(final EntityManagerManager entityManagerManager)
{
try
{
final EntityManager entityManager = entityManagerManager
.getEntityManager(persistenceUnitName);
return entityManager.find(entityClass, id);
}
catch (final Exception ex)
{
throw new RuntimeException(String.format(
"Failed to load session-persisted entity %s(%s): %s", entityClass.getName(),
id, ex));
}
}
@Override
public String toString()
{
return String.format("", entityClass.getName(), id);
}
}