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


1 package com.lowagie.bc.asn1;
2
3 import java.io.IOException;
4 import java.util.Enumeration;
5
6 /**
7  * BER TaggedObject - in ASN.1 nottation this is any object proceeded by
8  * a [n] where n is some number - these are assume to follow the construction
9  * rules (as with sequences).
10  */
11 public class BERTaggedObject
12     extends DERTaggedObject
13 {
14     /**
15      * @param tagNo the tag number for this object.
16      * @param obj the tagged object.
17      */
18     public BERTaggedObject(
19         int tagNo,
20         DEREncodable obj)
21     {
22         super(tagNo, obj);
23     }
24
25     /**
26      * @param explicit true if an explicitly tagged object.
27      * @param tagNo the tag number for this object.
28      * @param obj the tagged object.
29      */
30     public BERTaggedObject(
31         boolean explicit,
32         int tagNo,
33         DEREncodable obj)
34     {
35         super(explicit, tagNo, obj);
36     }
37
38     /**
39      * create an implicitly tagged object that contains a zero
40      * length sequence.
41      */
42     public BERTaggedObject(
43         int tagNo)
44     {
45         super(false, tagNo, new BERConstructedSequence());
46     }
47
48     void encode(
49         DEROutputStream out)
50         throws IOException
51     {
52         if (out instanceof ASN1OutputStream || out instanceof BEROutputStream)
53         {
54             out.write(CONSTRUCTED | TAGGED | tagNo);
55             out.write(0x80);
56
57             if (!empty)
58             {
59                 if (!explicit)
60                 {
61                     if (obj instanceof ASN1OctetString)
62                     {
63                         Enumeration e;
64
65                         if (obj instanceof BERConstructedOctetString)
66                         {
67                             e = ((BERConstructedOctetString)obj).getObjects();
68                         }
69                         else
70                         {
71                             ASN1OctetString octs = (ASN1OctetString)obj;
72                             BERConstructedOctetString berO = new BERConstructedOctetString(octs.getOctets());
73
74                             e = berO.getObjects();
75                         }
76
77                         while (e.hasMoreElements())
78                         {
79                             out.writeObject(e.nextElement());
80                         }
81                     }
82                     else if (obj instanceof ASN1Sequence)
83                     {
84                         Enumeration e = ((ASN1Sequence)obj).getObjects();
85
86                         while (e.hasMoreElements())
87                         {
88                             out.writeObject(e.nextElement());
89                         }
90                     }
91                     else if (obj instanceof ASN1Set)
92                     {
93                         Enumeration e = ((ASN1Set)obj).getObjects();
94
95                         while (e.hasMoreElements())
96                         {
97                             out.writeObject(e.nextElement());
98                         }
99                     }
100                     else
101                     {
102                         throw new RuntimeException("not implemented: " + obj.getClass().getName());
103                     }
104                 }
105                 else
106                 {
107                     out.writeObject(obj);
108                 }
109             }
110
111             out.write(0x00);
112             out.write(0x00);
113         }
114         else
115         {
116             super.encode(out);
117         }
118     }
119 }
120
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