Source code: com/k_int/codec/runtime/NULL_codec.java
1 /**
2 *
3 * NULL_codec
4 *
5 * @author Ian Ibbotson ( ibbo@k-int.com )
6 * @version $Id: NULL_codec.java,v 1.2 2000/12/23 10:44:33 ianibbo Exp $
7 *
8 * Copyright: Copyright (C) 2000, Knowledge Integration Ltd.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public License
12 * as published by the Free Software Foundation; either version 2.1 of
13 * the license, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite
23 * 330, Boston, MA 02111-1307, USA.
24 *
25 *
26 */
27
28 package com.k_int.codec.runtime;
29
30 public class NULL_codec extends base_codec
31 {
32 private static NULL_codec me = null;
33
34 public static NULL_codec getCodec()
35 {
36 if ( null == me )
37 me = new NULL_codec();
38
39 return me;
40 }
41
42 public Object serialize(SerializationManager sm,
43 Object type_instance,
44 boolean is_optional,
45 String type_name) throws java.io.IOException
46 {
47 AsnNull retval = (AsnNull)type_instance;
48 boolean is_constructed = false;
49
50 if ( sm.getDirection() == SerializationManager.DIRECTION_ENCODE )
51 {
52 if ( null != retval )
53 {
54 sm.implicit_settag(SerializationManager.UNIVERSAL, SerializationManager.NULL);
55 int len = sm.tag_codec(false);
56 if ( len >= 0 )
57 retval = sm.null_codec(retval, is_constructed);
58 }
59 }
60 else if ( sm.getDirection() == SerializationManager.DIRECTION_DECODE )
61 {
62 sm.implicit_settag(SerializationManager.UNIVERSAL, SerializationManager.NULL);
63 int len = sm.tag_codec(false);
64 if ( len >= 0 )
65 retval = sm.null_codec(retval, is_constructed);
66 }
67
68 if ( ( null == retval ) && ( ! is_optional ) )
69 throw new java.io.IOException("Missing mandatory member: "+type_name);
70
71 return (Object)retval;
72 }
73 }