code: /***************************************************************************
   *   Copyright (C) 2008 by Elvis Ciotti                                    *
   *   Copyright (C) 2009 by Fabrizio Montesi                                *
   *                                                                         *
   *   This program is free software; you can redistribute it and/or modify  *
   *   it under the terms of the GNU Library General Public License as       *
   *   published by the Free Software Foundation; either version 2 of the    *
   *   License, or (at your option) any later version.                       *
   *                                                                         *
   *   This program is distributed in the hope that it will be useful,       *
   *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
   *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
   *   GNU General Public License for more details.                          *
   *                                                                         *
   *   You should have received a copy of the GNU Library General Public     *
   *   License along with this program; if not, write to the                 *
   *   Free Software Foundation, Inc.,                                       *
   *   59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.             *
   *                                                                         *
   *   For details about the authors of this software, see the AUTHORS file. *
   ***************************************************************************/
  
  package jolie.util;
  
  import java.io.Serializable;
  import jolie.lang.Constants;
  
  /**
   * A <code>Range</code> instance represents a range between two natural numbers.
   * @author Fabrizio Montesi
   */
  public class Range implements Serializable
  {
  	private static final long serialVersionUID = Constants.serialVersionUID();
  	private static final int HASH_INIT_VALUE = 7;
  	private static final int HASH_FACTOR = 47;
  
  	private final int min;
  	private final int max;
  
  	/**
  	 * Constructor
  	 * @param min
  	 * @param max
  	 * @throws IllegalArgumentException if min or max are less than zero
  	 */
  	public Range( int min, int max )
  	{
  		if ( min < 0 || max < 0 ) {
  			throw new IllegalArgumentException();
  		}
  
  		this.min = min;
  		this.max = max;
  	}
  
  	public final int min()
  	{
  		return min;
  	}
  
  	public final int max()
  	{
  		return max;
  	}
  
  	@Override
  	public int hashCode()
  	{
  		int hash = HASH_INIT_VALUE;
  		hash = HASH_FACTOR * hash + this.min;
  		hash = HASH_FACTOR * hash + this.max;
  		return hash;
  	}
  
  	@Override
  	public boolean equals( Object other )
  	{
  		if ( this == other ) {
  			return true;
  		}
  
  		if ( other instanceof Range ) {
  			Range otherRange = (Range)other;
  			return min == otherRange.min && max == otherRange.max;
  		}
  
  		return false;
  	}
  }
  