DERBoolean


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  public class DERBoolean
23      extends DERObject
24  {
25      byte         value;
26  
27      public static final DERBoolean FALSE = new DERBoolean(false);
28      public static final DERBoolean TRUE  = new DERBoolean(true);
29  
30      /**
31       * return a boolean from the passed in object.
32       *
33       * @exception IllegalArgumentException if the object cannot be converted.
34       */
35      public static DERBoolean getInstance(
36          Object    obj)
37      {
38          if (obj == null || obj instanceof DERBoolean)
39          {
40              return (DERBoolean)obj;
41          }
42  
43          if (obj instanceof ASN1OctetString)
44          {
45              return new DERBoolean(((ASN1OctetString)obj).getOctets());
46          }
47  
48          if (obj instanceof ASN1TaggedObject)
49          {
50              return getInstance(((ASN1TaggedObject)obj).getObject());
51          }
52  
53          throw new IllegalArgumentException  ("illegal object in getInstance: " + obj.getClass().getName());
54      }
55  
56      /**
57       * return a DERBoolean from the passed in boolean.
58       */
59      public static DERBoolean getInstance(
60          boolean  value)
61      {
62          return (value ? TRUE : FALSE);
63      }
64  
65      /**
66       * return a Boolean from a tagged object.
67       *
68       * @param obj the tagged object holding the object we want
69       * @param explicit true if the object is meant to be explicitly
70       *              tagged false otherwise.
71       * @exception IllegalArgumentException if the tagged object cannot
72       *               be converted.
73       */
74      public static DERBoolean getInstance(
75          ASN1TaggedObject obj,
76          boolean          explicit)
77      {
78          return getInstance(obj.getObject());
79      }
80  
81      public DERBoolean(
82          byte[]       value)
83      {
84          this.value = value[0];
85      }
86  
87      public DERBoolean(
88          boolean     value)
89      {
90          this.value = (value) ? (byte)0xff : (byte)0;
91      }
92  
93      public boolean isTrue()
94      {
95          return (value != 0);
96      }
97  
98      void encode(
99          DEROutputStream out)
100         throws IOException  
101     {
102         byte[]  bytes = new byte[1];
103 
104         bytes[0] = value;
105 
106         out.writeEncoded(BOOLEAN, bytes);
107     }
108 
109     public boolean equals(
110         Object    o)
111     {
112         if ((o == null) || !(o instanceof DERBoolean))
113         {
114             return false;
115         }
116 
117         return (value == ((DERBoolean)o).value);
118     }
119 
120     public int hashCode()
121     {
122         return value;
123     }
124 
125 }
126
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