DERUniversalString


1   /**
2    *  Licensed to the Apache Software Foundation (ASF) under one or more
3    *  contributor license agreements.  See the NOTICE file distributed with
4    *  this work for additional information regarding copyright ownership.
5    *  The ASF licenses this file to You under the Apache License, Version 2.0
6    *  (the "License"); you may not use this file except in compliance with
7    *  the License.  You may obtain a copy of the License at
8    *
9    *     http://www.apache.org/licenses/LICENSE-2.0
10   *
11   *  Unless required by applicable law or agreed to in writing, software
12   *  distributed under the License is distributed on an "AS IS" BASIS,
13   *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14   *  See the License for the specific language governing permissions and
15   *  limitations under the License.
16   */
17  
18  package org.apache.geronimo.util.asn1;
19  
20  import java.io.ByteArrayOutputStream  ;
21  import java.io.IOException  ;
22  
23  /**
24   * DER UniversalString object.
25   */
26  public class DERUniversalString
27      extends DERObject
28      implements DERString
29  {
30      private static final char[]  table = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' };
31      private byte[] string;
32  
33      /**
34       * return a Universal String from the passed in object.
35       *
36       * @exception IllegalArgumentException if the object cannot be converted.
37       */
38      public static DERUniversalString getInstance(
39          Object    obj)
40      {
41          if (obj == null || obj instanceof DERUniversalString)
42          {
43              return (DERUniversalString)obj;
44          }
45  
46          if (obj instanceof ASN1OctetString)
47          {
48              return new DERUniversalString(((ASN1OctetString)obj).getOctets());
49          }
50  
51          throw new IllegalArgumentException  ("illegal object in getInstance: " + obj.getClass().getName());
52      }
53  
54      /**
55       * return a Universal String from a tagged object.
56       *
57       * @param obj the tagged object holding the object we want
58       * @param explicit true if the object is meant to be explicitly
59       *              tagged false otherwise.
60       * @exception IllegalArgumentException if the tagged object cannot
61       *               be converted.
62       */
63      public static DERUniversalString getInstance(
64          ASN1TaggedObject obj,
65          boolean          explicit)
66      {
67          return getInstance(obj.getObject());
68      }
69  
70      /**
71       * basic constructor - byte encoded string.
72       */
73      public DERUniversalString(
74          byte[]   string)
75      {
76          this.string = string;
77      }
78  
79      public String   getString()
80      {
81          StringBuffer      buf = new StringBuffer  ("#");
82          ByteArrayOutputStream      bOut = new ByteArrayOutputStream  ();
83          ASN1OutputStream            aOut = new ASN1OutputStream(bOut);
84  
85          try
86          {
87              aOut.writeObject(this);
88          }
89          catch (IOException   e)
90          {
91             throw new RuntimeException  ("internal error encoding BitString");
92          }
93  
94          byte[]    string = bOut.toByteArray();
95  
96          for (int i = 0; i != string.length; i++)
97          {
98              buf.append(table[(string[i] >>> 4) % 0xf]);
99              buf.append(table[string[i] & 0xf]);
100         }
101 
102         return buf.toString();
103     }
104 
105     public byte[] getOctets()
106     {
107         return string;
108     }
109 
110     void encode(
111         DEROutputStream  out)
112         throws IOException  
113     {
114         out.writeEncoded(UNIVERSAL_STRING, this.getOctets());
115     }
116 
117     public boolean equals(
118         Object    o)
119     {
120         if ((o == null) || !(o instanceof DERUniversalString))
121         {
122             return false;
123         }
124 
125         return this.getString().equals(((DERUniversalString)o).getString());
126     }
127 
128     public int hashCode()
129     {
130         return this.getString().hashCode();
131     }
132 }
133
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