/*******************************************************************************
* Copyright (c) 2006, 2015 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
* Stefan Xenos <sxenos@gmail.com> - Bug 335792
* Stefan Xenos <sxenos@gmail.com> - Bug 474065
******************************************************************************/
package org.eclipse.core.databinding.observable.value;
import org.eclipse.core.databinding.observable.IObservablesListener;
import org.eclipse.core.databinding.observable.ObservableEvent;
/**
* Value change event describing a change of an {@link IObservableValue}
* object's current value.
*
* @param <T>
* the type of value being observed
*
* @since 1.0
*
*/
public class ValueChangeEvent<T> extends ObservableEvent {
/**
*
*/
private static final long serialVersionUID = 2305345286999701156L;
static final Object TYPE = new Object();
/**
* Description of the change to the source observable value. Listeners must
* not change this field.
*/
public ValueDiff<T> diff;
/**
* Creates a new value change event.
*
* @param source
* the source observable value
* @param diff
* the value change
*/
public ValueChangeEvent(IObservableValue<T> source, ValueDiff<T> diff) {
super(source);
this.diff = diff;
}
/**
* Returns the observable value from which this event originated.
*
* @return returns the observable value from which this event originated
*/
@SuppressWarnings("unchecked")
public IObservableValue<T> getObservableValue() {
return (IObservableValue<T>) getSource();
}
@SuppressWarnings("unchecked")
@Override
protected void dispatch(IObservablesListener listener) {
((IValueChangeListener<T>) listener).handleValueChange(this);
}
@Override
protected Object getListenerType() {
return TYPE;
}
}