Base64


1   /*
2   
3   This software is OSI Certified Open Source Software.
4   OSI Certified is a certification mark of the Open Source Initiative.
5   
6   The license (Mozilla version 1.0) can be read at the MMBase site.
7   See http://www.MMBase.org/license
8   
9   */
10  package org.mmbase.util.transformers;
11  
12  import java.util.HashMap  ;
13  import java.util.Map  ;
14  
15  import sun.misc.BASE64Decoder;
16  import sun.misc.BASE64Encoder;
17  
18  /**
19   * Uses the sun.misc classes to do BASE64 encoding and decoding. The
20   * sun.misc classes are not supported by Sun. Perhaps once we have to
21   * plug in another class.
22   *
23   * @author Michiel Meeuwissen
24   */
25  
26  public class Base64 extends ByteArrayToCharTransformer implements ByteToCharTransformer, ConfigurableTransformer {
27      private final static String   ENCODING = "BASE64";
28      private final static int BASE_64 = 1;
29  
30      int to = BASE_64;
31  
32      public void configure(int t) {
33          to = t;
34      }
35  
36      /**
37       * Used when registering this class as a possible Transformer
38       */
39  
40      public Map   transformers() {
41          HashMap   h = new HashMap  ();
42          h.put(ENCODING, new Config(Base64.class, BASE_64, "Base 64 encoding base on sun.misc.BASE64* classes"));
43          return h;
44      }
45  
46  
47      public String   transform(byte[] bytes) {
48          return new BASE64Encoder().encode(bytes);
49      }
50  
51      public byte[] transformBack(String   r) {
52          try {
53              BASE64Decoder dec = new BASE64Decoder();
54              return dec.decodeBuffer(r);
55          } catch (Exception   e) {
56              e.printStackTrace();
57              throw new IllegalArgumentException  ("the entered string to decode properly was wrong: " + e);
58          }
59      }
60  
61      public String   getEncoding() {
62          return ENCODING;
63      }
64  }
65
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