/*******************************************************************************
 * Copyright (c) 2008 Institute for Software, HSR Hochschule fuer Technik  
 * Rapperswil, University of applied sciences 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: 
 * Institute for Software - initial API and implementation
 *******************************************************************************/
package org.eclipse.cdt.internal.ui.refactoring;

import java.util.Comparator;
import java.util.TreeSet;

import org.eclipse.ltk.core.refactoring.Change;
import org.eclipse.ltk.core.refactoring.CompositeChange;

import org.eclipse.cdt.ui.refactoring.CTextFileChange;

/**
 * @author Emanuel Graf
 *
 */
public class ChangeTreeSet {
	
	private static final class ChangePositionComparator implements Comparator<CTextFileChange> {
		public int compare(CTextFileChange o1, CTextFileChange o2) {
			if(o1.getFile().equals(o2.getFile())){
				return o2.getEdit().getOffset() - o1.getEdit().getOffset();
			}
			return o2.getFile().hashCode() - o1.getFile().hashCode();
		}
	}
	
	private final TreeSet<CTextFileChange> changes = new TreeSet<CTextFileChange>(new ChangePositionComparator());
	
	public void add(CTextFileChange change) {
		changes.add(change);
	}
	
	public CompositeChange getCompositeChange(String name) {
		CompositeChange allChanges = new CompositeChange(name);
		
		for (Change change : changes) {
			allChanges.add(change);
		}
		return allChanges;
	}

	@Override
	public String toString() {
		return changes.toString();
	}
}