package net.sourceforge.tuned;


import java.util.List;

import ca.odell.glazedlists.EventList;
import ca.odell.glazedlists.event.ListEvent;
import ca.odell.glazedlists.event.ListEventListener;


public class ListChangeSynchronizer<E> implements ListEventListener<E> {
	
	private final List<E> target;
	
	
	public ListChangeSynchronizer(EventList<E> source, List<E> target) {
		this.target = target;
		source.addListEventListener(this);
	}
	

	public void listChanged(ListEvent<E> listChanges) {
		EventList<E> source = listChanges.getSourceList();
		
		// update target list
		while (listChanges.next()) {
			int index = listChanges.getIndex();
			int type = listChanges.getType();
			
			switch (type) {
				case ListEvent.INSERT:
					target.add(index, source.get(index));
					break;
				case ListEvent.UPDATE:
					target.set(index, source.get(index));
					break;
				case ListEvent.DELETE:
					target.remove(index);
					break;
			}
		}
	}
	

	public static <E> ListChangeSynchronizer<E> syncEventListToList(EventList<E> source, List<E> target) {
		return new ListChangeSynchronizer<E>(source, target);
	}
	
}