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/*
 * PersistenceMemberElementImpl.java
 *
 * Created on March 2, 2000, 5:17 PM
 */

package com.sun.jdo.api.persistence.model.jdo.impl;

import java.beans.PropertyVetoException;

import com.sun.jdo.api.persistence.model.jdo.PersistenceMemberElement;
import com.sun.jdo.api.persistence.model.jdo.PersistenceClassElement;

/** 
 *
 * @author raccah
 * @version %I%
 */
public abstract class PersistenceMemberElementImpl 
	extends PersistenceElementImpl implements PersistenceMemberElement.Impl
{
	/** Create new PersistenceMemberElementImpl with no corresponding name.   
	 * This constructor should only be used for cloning and archiving.
	 */
	public PersistenceMemberElementImpl ()
	{
		this(null);
	}

	/** Creates new PersistenceMemberElementImpl with the corresponding name 
	 * @param name the name of the element
	 */
	public PersistenceMemberElementImpl (String name)
	{
		super(name);
	}

	/** Fires property change event.  This method overrides that of 
	 * PersistenceElementImpl to update the PersistenceClassElementImpl's  
	 * modified status.
	 * @param name property name
	 * @param o old value
	 * @param n new value
	 */
	protected final void firePropertyChange (String name, Object o, Object n)
	{
		// even though o == null and n == null will signify a change, that 
		// is consistent with PropertyChangeSupport's behavior and is 
		// necessary for this to work
		boolean noChange = ((o != null) && (n != null) && o.equals(n));
		PersistenceClassElement classElement = 
			((PersistenceMemberElement)_element).getDeclaringClass();

		super.firePropertyChange(name, o, n);

		if ((classElement != null) && !noChange)
			classElement.setModified(true);
	}

	/** Fires vetoable change event.  This method overrides that of 
	 * PersistenceElementImpl to give listeners a chance to block 
	 * changes on the persistence class element modified status.
	 * @param name property name
	 * @param o old value
	 * @param n new value
	 * @exception PropertyVetoException when the change is vetoed by a listener
	 */
	protected final void fireVetoableChange (String name, Object o, Object n)
		throws PropertyVetoException
	{
		// even though o == null and n == null will signify a change, that 
		// is consistent with PropertyChangeSupport's behavior and is 
		// necessary for this to work
		boolean noChange = ((o != null) && (n != null) && o.equals(n));
		PersistenceClassElement classElement = 
			((PersistenceMemberElement)_element).getDeclaringClass();

		super.fireVetoableChange(name, o, n);

		if ((classElement != null) && !noChange)
		{
			((PersistenceElementImpl)classElement.getImpl()).
				fireVetoableChange(PROP_MODIFIED, Boolean.FALSE, Boolean.TRUE);
		}
	}
}