de.jaret.util.misc
Class PropertyObservableBase

java.lang.Object
  de.jaret.util.misc.PropertyObservableBase

All Implemented Interfaces:

PropertyObservable

Direct Known Subclasses:

IntervalImpl, JaretDate

public class PropertyObservableBase
extends Object
implements PropertyObservable

Base implementation for an observable object.

Version:

$Id: PropertyObservableBase.java 250 2007-02-12 00:15:49Z olk $

Author:

Peter Kliem

Field Summary

protected PropertyChangeSupport

_propertyChangeSupport PropertyChangeSupport for handling listeners.

Constructor Summary

PropertyObservableBase()

Method Summary

void	addPropertyChangeListener(PropertyChangeListener listener) Add a listener to be informed when a property changes.
protected void	firePropertyChange(String propName, Object oldVal, Object newVal) Inform listeners about a property change.
static boolean	isRealModification(Object o1, Object o2) Check whether two object differ including null checks.
void	removePropertyChangeListener(PropertyChangeListener listener) Remove a previously added PropertyChangeListener.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

_propertyChangeSupport

protected PropertyChangeSupport _propertyChangeSupport

PropertyChangeSupport for handling listeners.

Constructor Detail

PropertyObservableBase

public PropertyObservableBase()

Method Detail

isRealModification

public static boolean isRealModification(Object o1,
                                         Object o2)

Check whether two object differ including null checks.

Parameters:

o1 - object 1

o2 - object 2

Returns:

true if the objects are not equal

firePropertyChange

protected void firePropertyChange(String propName,
                                  Object oldVal,
                                  Object newVal)

Inform listeners about a property change.

Parameters:

propName - name of the property

oldVal - old value

newVal - new value

addPropertyChangeListener

public void addPropertyChangeListener(PropertyChangeListener listener)

Add a listener to be informed when a property changes.

Specified by:

addPropertyChangeListener in interface PropertyObservable

Parameters:

listener - PropertyChangeListener to inform

removePropertyChangeListener

public void removePropertyChangeListener(PropertyChangeListener listener)

Remove a previously added PropertyChangeListener.

Specified by:

removePropertyChangeListener in interface PropertyObservable

Parameters:

listener - listener to remove.