HashWrapper.java

/*
 * Created on 22 juil. 2003
 *
 * Copyright (C) 2003, 2004, 2005, 2006 Aelitis, All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU 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 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.
 *
 * AELITIS, SAS au capital de 46,603.30 euros
 * 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
 */
package org.gudy.azureus2.core3.util;

import java.util.Arrays;

import org.gudy.azureus2.plugins.utils.ByteArrayWrapper;

/**
 * @author Olivier
 * 
 */
public class 
HashWrapper 
	implements ByteArrayWrapper
{
  
  private byte[] 	hash;
  private int		hash_code;
  
  public HashWrapper(byte[] _hash) 
  {
  	this(_hash,0,_hash.length);
  }
  
  public HashWrapper(byte[] _hash, int offset,int length) 
  {
	 hash = new byte[length];
	 
	 System.arraycopy(_hash,offset,hash,0,length);

	 for (int i = 0; i < length; i++) {
	   
	 	hash_code = 31*hash_code + hash[i];
	 }
   }
  
  public boolean equals(Object o) {
    if(! (o instanceof HashWrapper))
      return false;
    
    byte[] otherHash = ((HashWrapper)o).getHash();
	return Arrays.equals(hash, otherHash);	
  }
  
  public byte[] 
  getHash() 
  {
    return( hash );
  }

  public byte[]
  getBytes()
  {
  	return( hash );
  }
  
  /* (non-Javadoc)
   * @see java.lang.Object#hashCode()
   */
  public int hashCode() 
  {
  	return( hash_code );
  }
  
  public String toBase32String() {
  	return Base32.encode(hash);
  }
}