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/*
* PersistenceElementImpl.java
*
* Created on March 1, 2000, 5:01 PM
*/
package com.sun.jdo.api.persistence.model.jdo.impl;
import com.sun.jdo.api.persistence.model.ModelException;
import com.sun.jdo.api.persistence.model.ModelVetoException;
import com.sun.jdo.api.persistence.model.jdo.PersistenceElement;
import com.sun.jdo.api.persistence.model.jdo.PersistenceElementProperties;
import java.beans.*;
/* TODO:
1. way to get to declaring class from here?
*/
/**
*
* @author raccah
* @version %I%
*/
public abstract class PersistenceElementImpl extends Object
implements PersistenceElement.Impl, PersistenceElementProperties
{
/** Element */
PersistenceElement _element;
/** Property change support */
private PropertyChangeSupport _support;
/** Vetoable change support */
private transient VetoableChangeSupport _vetoableSupport;
/** Name of the element. */
private String _name;
/** Create new PersistenceElementImpl with no corresponding name. This
* constructor should only be used for cloning and archiving.
*/
public PersistenceElementImpl ()
{
this(null);
}
/** Creates new PersistenceElementImpl with the corresponding name
* @param name the name of the element
*/
public PersistenceElementImpl (String name)
{
super();
_name = name;
}
/** Called to attach the implementation to a specific
* element. Will be called in the element's constructor.
* Allows implementors of this interface to store a reference to the
* holder class, useful for implementing the property change listeners.
*
* @param element the element to attach to
*/
public void attachToElement (PersistenceElement element)
{
_element = element;
}
/** Fires property change event.
* @param name property name
* @param o old value
* @param n new value
*/
protected void firePropertyChange (String name, Object o, Object n)
{
if (_support != null)
_support.firePropertyChange(name, o, n);
}
/** Add a property change listener.
* @param l the listener to add
*/
public synchronized void addPropertyChangeListener
(PropertyChangeListener l)
{
// new test under synchronized block
if (_support == null)
_support = new PropertyChangeSupport(_element);
_support.addPropertyChangeListener(l);
}
/** Remove a property change listener.
* @param l the listener to remove
*/
public synchronized void removePropertyChangeListener (
PropertyChangeListener l)
{
if (_support != null)
_support.removePropertyChangeListener(l);
}
/** Fires vetoable change event.
* @param name property name
* @param o old value
* @param n new value
* @exception PropertyVetoException when the change is vetoed by a listener
*/
protected void fireVetoableChange (String name, Object o, Object n)
throws PropertyVetoException
{
if (_vetoableSupport != null)
_vetoableSupport.fireVetoableChange(name, o, n);
}
/** Add a vetoable change listener.
* @param l the listener to add
*/
public synchronized void addVetoableChangeListener
(VetoableChangeListener l)
{
if (_vetoableSupport == null)
_vetoableSupport = new VetoableChangeSupport(_element);
_vetoableSupport.addVetoableChangeListener(l);
}
/** Remove a vetoable change listener.
* @param l the listener to remove
*/
public synchronized void removeVetoableChangeListener (
VetoableChangeListener l)
{
if (_vetoableSupport != null)
_vetoableSupport.removeVetoableChangeListener(l);
}
/** Get the name of this persistence element.
* @return the name
*/
public String getName () { return _name; }
/** Set the name of this persistence element.
* @param name the name
* @exception ModelException if impossible
*/
public void setName (String name) throws ModelException
{
String old = getName();
try
{
fireVetoableChange(PROP_NAME, old, name);
_name = name;
firePropertyChange(PROP_NAME, old, name);
}
catch (PropertyVetoException e)
{
throw new ModelVetoException(e);
}
}
}