Package org.eclipse.core.runtime

Class Preferences.PropertyChangeEvent

java.lang.Object

java.util.EventObject

org.eclipse.core.runtime.Preferences.PropertyChangeEvent

All Implemented Interfaces:

Serializable

Enclosing class:

Preferences

public static class Preferences.PropertyChangeEvent
extends EventObject

An event object describing a change to a named property.

The preferences object reports property change events for internal state changes that may be of interest to external parties. A special listener interface (Preferences.IPropertyChangeListener) is defined for this purpose. Listeners are registered via the Preferences.addPropertyChangeListener method.

Clients cannot instantiate or subclass this class.

See Also:

Preferences.addPropertyChangeListener(Preferences.IPropertyChangeListener), Preferences.IPropertyChangeListener, Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	PropertyChangeEvent(Object source, String property, Object oldValue, Object newValue)	Creates a new property change event.

Method Summary

Modifier and Type	Method	Description
Object	getNewValue()	Returns the new value of the property.
Object	getOldValue()	Returns the old value of the property.
String	getProperty()	Returns the name of the property that changed.

Methods inherited from class java.util.EventObject

getSource, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

PropertyChangeEvent

protected PropertyChangeEvent(Object source,
                              String property,
                              Object oldValue,
                              Object newValue)

Creates a new property change event.

Parameters:

source - the object whose property has changed

property - the property that has changed (must not be null)

oldValue - the old value of the property, or null if none

newValue - the new value of the property, or null if none

Method Detail

getProperty

public String getProperty()

Returns the name of the property that changed.

Warning: there is no guarantee that the property name returned is a constant string. Callers must compare property names using equals, not ==.

Returns:

the name of the property that changed

getNewValue

public Object getNewValue()

Returns the new value of the property.

Returns:

the new value, or null if not known or not relevant

getOldValue

public Object getOldValue()

Returns the old value of the property.

Returns:

the old value, or null if not known or not relevant