ASN1Null.java revision e6bf3e8dfa2804891a82075cb469b736321b4827 
1package org.bouncycastle.asn1;
2
3import java.io.IOException;
4
5/**
6 * A NULL object.
7 */
8public abstract class ASN1Null
9    extends ASN1Primitive
10{
11    // BEGIN android-changed
12    /*package*/ ASN1Null()
13    {
14    }
15    // END android-changed
16
17    public static ASN1Null getInstance(Object o)
18    {
19        if (o instanceof ASN1Null)
20        {
21            return (ASN1Null)o;
22        }
23
24        if (o != null)
25        {
26            try
27            {
28                return ASN1Null.getInstance(ASN1Primitive.fromByteArray((byte[])o));
29            }
30            catch (IOException e)
31            {
32                throw new IllegalArgumentException("failed to construct NULL from byte[]: " + e.getMessage());
33            }
34            catch (ClassCastException e)
35            {
36                throw new IllegalArgumentException("unknown object in getInstance(): " + o.getClass().getName());
37            }
38        }
39
40        return null;
41    }
42
43    public int hashCode()
44    {
45        return -1;
46    }
47
48    boolean asn1Equals(
49        ASN1Primitive o)
50    {
51        if (!(o instanceof ASN1Null))
52        {
53            return false;
54        }
55
56        return true;
57    }
58
59    abstract void encode(ASN1OutputStream out)
60        throws IOException;
61
62    public String toString()
63    {
64         return "NULL";
65    }
66}
67