org.apache.tapestry.event
Class ObservedChangeEvent

java.lang.Object
  java.util.EventObject
      org.apache.tapestry.event.ObservedChangeEvent

All Implemented Interfaces:

Serializable

public class ObservedChangeEvent
extends EventObject

Event which describes a change to a particular IComponent.

Author:

Howard Ship

See Also:

Serialized Form

Field Summary

Fields inherited from class java.util.EventObject

source

Constructor Summary

ObservedChangeEvent(IComponent component, String propertyName, Object newValue)
Creates the event.

Method Summary

IComponent	getComponent()
Object	getNewValue()
String	getPropertyName()

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

ObservedChangeEvent

public ObservedChangeEvent(IComponent component,
                           String propertyName,
                           Object newValue)

Creates the event. The new value must be null, or be a serializable object. (It is declared as Object as a concession to the Java 2 collections framework, where the implementations are serializable but the interfaces (Map, List, etc.) don't extend Serializable ... so we wait until runtime to check).

Parameters:

component - The component (not necessarily a page) whose property changed.

propertyName - the name of the property which was changed.

newValue - The new value of the property.

Throws:

IllegalArgumentException - if propertyName is null, or if the new value is not serializable

Method Detail

getComponent

public IComponent getComponent()

getNewValue

public Object getNewValue()

getPropertyName

public String getPropertyName()