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Java > Open Source Codes > com > lowagie > bc > asn1 > DEREnumerated


1 package com.lowagie.bc.asn1;
2
3 import java.io.IOException;
4 import java.math.BigInteger;
5
6 public class DEREnumerated
7     extends DERObject
8 {
9     byte[] bytes;
10
11     /**
12      * return an integer from the passed in object
13      *
14      * @exception IllegalArgumentException if the object cannot be converted.
15      */
16     public static DEREnumerated getInstance(
17         Object obj)
18     {
19         if (obj == null || obj instanceof DEREnumerated)
20         {
21             return (DEREnumerated)obj;
22         }
23
24         if (obj instanceof ASN1OctetString)
25         {
26             return new DEREnumerated(((ASN1OctetString)obj).getOctets());
27         }
28
29         if (obj instanceof ASN1TaggedObject)
30         {
31             return getInstance(((ASN1TaggedObject)obj).getObject());
32         }
33
34         throw new IllegalArgumentException("illegal object in getInstance: " + obj.getClass().getName());
35     }
36
37     /**
38      * return an Enumerated from a tagged object.
39      *
40      * @param obj the tagged object holding the object we want
41      * @param explicit true if the object is meant to be explicitly
42      * tagged false otherwise.
43      * @exception IllegalArgumentException if the tagged object cannot
44      * be converted.
45      */
46     public static DEREnumerated getInstance(
47         ASN1TaggedObject obj,
48         boolean explicit)
49     {
50         return getInstance(obj.getObject());
51     }
52
53     public DEREnumerated(
54         int value)
55     {
56         bytes = BigInteger.valueOf(value).toByteArray();
57     }
58
59     public DEREnumerated(
60         BigInteger value)
61     {
62         bytes = value.toByteArray();
63     }
64
65     public DEREnumerated(
66         byte[] bytes)
67     {
68         this.bytes = bytes;
69     }
70
71     public BigInteger getValue()
72     {
73         return new BigInteger(bytes);
74     }
75
76     void encode(
77         DEROutputStream out)
78         throws IOException
79     {
80         out.writeEncoded(ENUMERATED, bytes);
81     }
82     
83     public boolean equals(
84         Object o)
85     {
86         if (o == null || !(o instanceof DEREnumerated))
87         {
88             return false;
89         }
90
91         DEREnumerated other = (DEREnumerated)o;
92
93         if (bytes.length != other.bytes.length)
94         {
95             return false;
96         }
97
98         for (int i = 0; i != bytes.length; i++)
99         {
100             if (bytes[i] != other.bytes[i])
101             {
102                 return false;
103             }
104         }
105
106         return true;
107     }
108 }
109
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