/*******************************************************************************
 * Copyright (c) 2003, 2010 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
 *******************************************************************************/
package org.eclipse.draw2d.graph;

import java.util.ArrayList;

/**
 * For internal use only. A list of lists.
 * 
 * @author hudsonr
 * @since 2.1.2
 */
public final class RankList {

	ArrayList ranks = new ArrayList();

	/**
	 * Returns the specified rank.
	 * 
	 * @param rank
	 *            the row
	 * @return the rank
	 */
	public Rank getRank(int rank) {
		while (ranks.size() <= rank)
			ranks.add(new Rank());
		return (Rank) ranks.get(rank);
	}

	/**
	 * Returns the total number or ranks.
	 * 
	 * @return the total number of ranks
	 */
	public int size() {
		return ranks.size();
	}

}