1 /*
2  * Created on 22 juil. 2003
3  *
4  * Copyright (C) Azureus Software, Inc, All Rights Reserved.
5  *
6  * This program is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU General Public License
8  * as published by the Free Software Foundation; either version 2
9  * of the License, or (at your option) any later version.
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
13  * GNU General Public License for more details.
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write to the Free Software
16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
17  */
18 package org.gudy.azureus2.core3.util;
19 
20 import java.util.Arrays;
21 
22 import org.gudy.azureus2.plugins.utils.ByteArrayWrapper;
23 
24 /**
25  * @author Olivier
26  *
27  */
28 public class
29 HashWrapper
30 	implements ByteArrayWrapper
31 {
32 
33   private byte[] 	hash;
34   private int		hash_code;
35 
HashWrapper(byte[] _hash)36   public HashWrapper(byte[] _hash)
37   {
38   	this(_hash,0,_hash.length);
39   }
40 
HashWrapper(byte[] _hash, int offset,int length)41   public HashWrapper(byte[] _hash, int offset,int length)
42   {
43 	 hash = new byte[length];
44 
45 	 System.arraycopy(_hash,offset,hash,0,length);
46 
47 	 for (int i = 0; i < length; i++) {
48 
49 	 	hash_code = 31*hash_code + hash[i];
50 	 }
51    }
52 
equals(Object o)53   public boolean equals(Object o) {
54     if(! (o instanceof HashWrapper))
55       return false;
56 
57     byte[] otherHash = ((HashWrapper)o).getHash();
58 	return Arrays.equals(hash, otherHash);
59   }
60 
61   public byte[]
getHash()62   getHash()
63   {
64     return( hash );
65   }
66 
67   public byte[]
getBytes()68   getBytes()
69   {
70   	return( hash );
71   }
72 
73   /* (non-Javadoc)
74    * @see java.lang.Object#hashCode()
75    */
hashCode()76   public int hashCode()
77   {
78   	return( hash_code );
79   }
80 
toBase32String()81   public String toBase32String() {
82   	return Base32.encode(hash);
83   }
84 }
85