Package java.beans

Class PropertyChangeEvent

java.lang.Object

java.util.EventObject

java.beans.PropertyChangeEvent

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

IndexedPropertyChangeEvent

public class PropertyChangeEvent
extends EventObject

An event that indicates that a constraint or a boundary of a property has changed.

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

Constructors

Constructor	Description
PropertyChangeEvent(Object source, String propertyName, Object oldValue, Object newValue)	The constructor used to create a new PropertyChangeEvent.

Method Summary

Modifier and Type	Method	Description
Object	getNewValue()	Returns the new value that the property now has.
Object	getOldValue()	Returns the old value that the property had.
Object	getPropagationId()	Returns the propagationId object.
String	getPropertyName()	Returns the name of the property that has changed.
void	setPropagationId(Object propagationId)	Sets the propagationId object.

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

public PropertyChangeEvent(Object source,
                           String propertyName,
                           Object oldValue,
                           Object newValue)

The constructor used to create a new PropertyChangeEvent.

Parameters:

source - the changed bean.

propertyName - the changed property, or null to indicate an unspecified set of the properties has changed.

oldValue - the previous value of the property, or null if the propertyName is null or the previous value is unknown.

newValue - the new value of the property, or null if the propertyName is null or the new value is unknown.

Method Detail

getPropertyName

public String getPropertyName()

Returns the name of the property that has changed. If an unspecified set of properties has changed it returns null.

Returns:

the name of the property that has changed, or null.

setPropagationId

public void setPropagationId(Object propagationId)

Sets the propagationId object.

See Also:

getPropagationId()

getPropagationId

public Object getPropagationId()

Returns the propagationId object. This is reserved for future use. Beans 1.0 demands that a listener receiving this property and then sending its own PropertyChangeEvent sets the received propagationId on the new PropertyChangeEvent's propagationId field.

Returns:

the propagationId object.

getOldValue

public Object getOldValue()

Returns the old value that the property had. If the old value is unknown this method returns null.

Returns:

the old property value or null.

getNewValue

public Object getNewValue()

Returns the new value that the property now has. If the new value is unknown this method returns null.

Returns:

the old property value or null.