/*******************************************************************************
* Copyright (c) 1998, 2008 Oracle. 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:
* Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.internal.dynamicpersist;
// Javase imports
// Java extension imports
// EclipseLink imports
import org.eclipse.persistence.indirection.ValueHolder;
import org.eclipse.persistence.indirection.ValueHolderInterface;
/**
* <p>
* <b>INTERNAL:</b> BaseEntityVHAccessor is similar to
* {@link BaseEntityAccessor}; however, it is used exclusively by O-X mappings
* as they require attribute navigation <i>through</i> the ValueHolder to the
* contained value.
*
* @author Mike Norman - michael.norman@oracle.com
* @since EclipseLink 1.x
*/
@SuppressWarnings("serial")
public class BaseEntityVHAccessor extends BaseEntityAccessor {
public BaseEntityVHAccessor(String attributeName, int fieldIdx) {
super(attributeName, fieldIdx);
}
@Override
public Object getAttributeValueFromObject(Object object) {
BaseEntity baseEntity = (BaseEntity) object;
// if the attribute's slot is empty, put in a dummy ValueHolder
// and return null
if (baseEntity.get(fieldIdx) == null) {
baseEntity.set(fieldIdx, new ValueHolder());
return null;
}
// return the value from the attribute's existing ValueHolder
return ((ValueHolderInterface) baseEntity.get(fieldIdx)).getValue();
}
@Override
public void setAttributeValueInObject(Object object, Object value) {
BaseEntity baseEntity = (BaseEntity) object;
// ValueHolders go directly into the attribute's slot
if (value instanceof ValueHolderInterface) {
baseEntity.set(fieldIdx, value);
return;
}
// what if this is the first time setting - the attribute's slot
// will be null and needs a dummy ValueHolder
if (baseEntity.get(fieldIdx) == null) {
baseEntity.set(fieldIdx, new ValueHolder());
}
// put the value into the attribute's existing ValueHolder
((ValueHolderInterface) baseEntity.get(fieldIdx)).setValue(value);
}
}