DERVisibleString


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.IOException  ;
21  
22  /**
23   * DER VisibleString object.
24   */
25  public class DERVisibleString
26      extends DERObject
27      implements DERString
28  {
29      String    string;
30  
31      /**
32       * return a Visible String from the passed in object.
33       *
34       * @exception IllegalArgumentException if the object cannot be converted.
35       */
36      public static DERVisibleString getInstance(
37          Object    obj)
38      {
39          if (obj == null || obj instanceof DERVisibleString)
40          {
41              return (DERVisibleString)obj;
42          }
43  
44          if (obj instanceof ASN1OctetString)
45          {
46              return new DERVisibleString(((ASN1OctetString)obj).getOctets());
47          }
48  
49          if (obj instanceof ASN1TaggedObject)
50          {
51              return getInstance(((ASN1TaggedObject)obj).getObject());
52          }
53  
54          throw new IllegalArgumentException  ("illegal object in getInstance: " + obj.getClass().getName());
55      }
56  
57      /**
58       * return a Visible String from a tagged object.
59       *
60       * @param obj the tagged object holding the object we want
61       * @param explicit true if the object is meant to be explicitly
62       *              tagged false otherwise.
63       * @exception IllegalArgumentException if the tagged object cannot
64       *               be converted.
65       */
66      public static DERVisibleString getInstance(
67          ASN1TaggedObject obj,
68          boolean          explicit)
69      {
70          return getInstance(obj.getObject());
71      }
72  
73      /**
74       * basic constructor - byte encoded string.
75       */
76      public DERVisibleString(
77          byte[]   string)
78      {
79          char[]  cs = new char[string.length];
80  
81          for (int i = 0; i != cs.length; i++)
82          {
83              cs[i] = (char)(string[i] & 0xff);
84          }
85  
86          this.string = new String  (cs);
87      }
88  
89      /**
90       * basic constructor
91       */
92      public DERVisibleString(
93          String     string)
94      {
95          this.string = string;
96      }
97  
98      public String   getString()
99      {
100         return string;
101     }
102 
103     public byte[] getOctets()
104     {
105         char[]  cs = string.toCharArray();
106         byte[]  bs = new byte[cs.length];
107 
108         for (int i = 0; i != cs.length; i++)
109         {
110             bs[i] = (byte)cs[i];
111         }
112 
113         return bs;
114     }
115 
116     void encode(
117         DEROutputStream  out)
118         throws IOException  
119     {
120         out.writeEncoded(VISIBLE_STRING, this.getOctets());
121     }
122 
123     public boolean equals(
124         Object    o)
125     {
126         if ((o == null) || !(o instanceof DERVisibleString))
127         {
128             return false;
129         }
130 
131         return this.getString().equals(((DERVisibleString)o).getString());
132     }
133 
134     public int hashCode()
135     {
136         return this.getString().hashCode();
137     }
138 }
139
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