/*******************************************************************************
* Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* tware - initial implementation
******************************************************************************/
package org.eclipse.persistence.internal.jpa.metamodel.proxy;
import java.io.Serializable;
import java.lang.ref.WeakReference;
import java.lang.reflect.Member;
import java.util.HashSet;
import java.util.Set;
import javax.persistence.metamodel.Attribute;
import javax.persistence.metamodel.ManagedType;
import org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl;
/**
* A proxy class that allows EclipseLink to trigger the deployment of a persistence unit
* as an Attribute is accessed in the metamodel.
* @author tware
*
* @param <X>
* @param <T>
*/
public class AttributeProxyImpl<X, T> implements Attribute<X, T>, Serializable {
protected Attribute<X, T> attribute = null;
protected Set<WeakReference<EntityManagerFactoryImpl>> factories = new HashSet<WeakReference<EntityManagerFactoryImpl>>();
public synchronized Attribute<X, T> getAttribute(){
if (attribute == null){
for (WeakReference<EntityManagerFactoryImpl> factoryRef: factories){
EntityManagerFactoryImpl factory = factoryRef.get();
if (factory != null){
factory.getDatabaseSession();
} else {
factories.remove(factoryRef);
}
}
}
return attribute;
}
public synchronized Attribute<X, T> getAttributeInternal(){
return attribute;
}
public synchronized void setAttribute(Attribute<X, T> attribute){
this.attribute = attribute;
}
public synchronized void addFactory(EntityManagerFactoryImpl factory){
for (WeakReference<EntityManagerFactoryImpl> factoryRef: factories){
if (factoryRef.get() != null && factoryRef.get().equals(factory)){
return;
}
}
factories.add(new WeakReference<EntityManagerFactoryImpl>(factory));
}
@Override
public String getName() {
return getAttribute().getName();
}
@Override
public javax.persistence.metamodel.Attribute.PersistentAttributeType getPersistentAttributeType() {
return getAttribute().getPersistentAttributeType();
}
@Override
public ManagedType<X> getDeclaringType() {
return getAttribute().getDeclaringType();
}
@Override
public Class<T> getJavaType() {
return getAttribute().getJavaType();
}
@Override
public Member getJavaMember() {
return getAttribute().getJavaMember();
}
@Override
public boolean isAssociation() {
return getAttribute().isAssociation();
}
@Override
public boolean isCollection() {
return getAttribute().isCollection();
}
}