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/*****************************************************************************
* Copyright (c) 2013 Cedric Dumoulin.
*
*
* 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:
* Cedric Dumoulin Cedric.dumoulin@lifl.fr - Initial API and implementation
*
*****************************************************************************/
package org.eclipse.papyrus.infra.core.sasheditor.utils;
import java.util.ArrayList;
import java.util.List;
/**
* A generic list that can be observed.
*
* @author cedric dumoulin
*
*/
public class ObservableList<T> extends ArrayList<T> implements IObservableList<T> {
/**
*
*/
private static final long serialVersionUID = 1L;
/** List of listeners */
private List<IObservableListListener<T>> listeners = new ArrayList<IObservableListListener<T>>();
/**
* Constructor.
*
*/
public ObservableList() {
// TODO Auto-generated constructor stub
}
/**
* Constructor.
*
* @param initialCapacity
*/
public ObservableList(int initialCapacity) {
super(initialCapacity);
}
/**
* For testing purpose.
*
* @return the listeners
*/
protected List<IObservableListListener<T>> getListeners() {
return listeners;
}
/**
* Add a listener on list change event event.
*
* @see org.eclipse.papyrus.infra.core.sasheditor.utils.IObservableList#addListener(org.eclipse.papyrus.infra.core.sasheditor.utils.IObservableListListener)
*
* @param listener
*/
@Override
public void addListener(IObservableListListener<T> listener) {
// no duplicate
if (listeners.contains(listener)) {
return;
}
listeners.add(listener);
}
/**
* Remove a listener on the list.
*
* @see org.eclipse.papyrus.infra.core.sasheditor.utils.IObservableList#removeListener(org.eclipse.papyrus.infra.core.sasheditor.utils.IObservableListListener)
*
* @param listener
*/
@Override
public void removeListener(IObservableListListener<T> listener) {
listeners.remove(listener);
}
/**
* Notify all listener with event.
*
* @param element
* The newly added element
*/
public void fireElementAddedEvent(T element) {
// Fire events to internal listeners
for (IObservableListListener<T> listener : listeners) {
listener.elementAdded(element);
}
}
/**
* Notify all listener with event.
*
* @param element
* The removed element.
*/
public void fireElementRemovedEvent(T element) {
// Fire events to internal listeners
for (IObservableListListener<T> listener : listeners) {
listener.elementRemoved(element);
}
}
/**
* Add the element, and fire the appropriate event.
*
* @see java.util.ArrayList#add(java.lang.Object)
*
* @param e
* @return
*/
@Override
public boolean add(T e) {
boolean res = super.add(e);
fireElementAddedEvent(e);
return res;
}
@SuppressWarnings("unchecked")
@Override
public boolean remove(Object o) {
boolean res = super.remove(o);
fireElementRemovedEvent((T) o);
return res;
}
}
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