1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* SNMP Package
*
* Copyright (C) 2002, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* This is free software. Redistribution and use in source and binary forms, with
* or without modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
* EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
* OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package snmp;
/**
* Object representing the SNMP Null data type.
*/
public class SNMPNull extends SNMPObject
{
protected byte tag = SNMPBERCodec.SNMPNULL;
/**
* Returns Java null reference.
*/
public Object getValue()
{
return null;
}
/**
* Always throws SNMPBadValueException (which null value did you want, anyway?)
*/
public void setValue(Object o)
throws SNMPBadValueException
{
throw new SNMPBadValueException(" Null: attempt to set value ");
}
/**
* Return BER encoding for a null object: two bytes, tag and length of 0.
*/
protected byte[] getBEREncoding()
{
byte[] encoding = new byte[2];
// set tag byte
encoding[0] = SNMPBERCodec.SNMPNULL;
// len = 0 since no payload!
encoding[1] = 0;
// no V!
return encoding;
}
/**
* Returns String "Null"..
*/
public String toString()
{
return new String("Null");
}
}
|
