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Java > Open Source Codes > snmp > SNMPCounter32


1 /*
2  * SNMP Package
3  *
4  * Copyright (C) 2004, Jonathan Sevy <jsevy@mcs.drexel.edu>
5  *
6  * This is free software. Redistribution and use in source and binary forms, with
7  * or without modification, are permitted provided that the following conditions
8  * are met:
9  *
10  * 1. Redistributions of source code must retain the above copyright notice, this
11  * list of conditions and the following disclaimer.
12  * 2. Redistributions in binary form must reproduce the above copyright notice,
13  * this list of conditions and the following disclaimer in the documentation
14  * and/or other materials provided with the distribution.
15  * 3. The name of the author may not be used to endorse or promote products
16  * derived from this software without specific prior written permission.
17  *
18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
19  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
20  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
21  * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
22  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
23  * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
25  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27  *
28  */
29
30
31 package snmp;
32
33
34
35 import java.math.*;
36
37
38 /**
39 * Defines a 32-bit counter, whose value wraps if initialized with a larger
40 * value. For an indicator which "pegs" at its maximum value if initialized with
41 * a larger value, use SNMPGauge32; for a counter with a wider range, use SNMPCounter64.
42 * @see snmp.SNMPGauge32
43 * @see snmp.SNMPCounter64
44 */
45
46
47 public class SNMPCounter32 extends SNMPInteger
48 {
49     // maximum value is 2^32 - 1
50 private static BigInteger maxValue = new BigInteger("4294967295");
51     
52     
53     
54     /** Initialize value to 0.
55     */
56     
57     public SNMPCounter32()
58     {
59         this(0); // initialize value to 0
60 }
61     
62     
63     public SNMPCounter32(long newValue)
64     {
65         tag = SNMPBERCodec.SNMPCOUNTER32;
66         
67         value = new BigInteger(new Long JavaDoc(newValue).toString());
68         
69         // wrap if value > maxValue
70 value = value.mod(maxValue);
71     }
72     
73     
74     
75     /** Used to initialize from the BER encoding, usually received in a response from
76     * an SNMP device responding to an SNMPGetRequest.
77     * @throws SNMPBadValueException Indicates an invalid BER encoding supplied. Shouldn't
78     * occur in normal operation, i.e., when valid responses are received from devices.
79     */
80     
81     protected SNMPCounter32(byte[] enc)
82         throws SNMPBadValueException
83     {
84         tag = SNMPBERCodec.SNMPCOUNTER32;
85         
86         extractValueFromBEREncoding(enc);
87         
88         // wrap if value > maxValue
89 value = value.mod(maxValue);
90     }
91     
92     
93     
94     
95     
96     /** Used to set the value with an instance of java.lang.Integer or
97     * java.lang.BigInteger. The value of the constructed SNMPCounter32 object is the
98     * supplied value mod 2^32.
99     * @throws SNMPBadValueException Indicates an incorrect object type supplied.
100     */
101     
102     public void setValue(Object JavaDoc newValue)
103         throws SNMPBadValueException
104     {
105         if (newValue instanceof BigInteger)
106         {
107             value = (BigInteger)newValue;
108             value = value.mod(maxValue); // wrap when value exceeds 2^32
109 }
110         else if (newValue instanceof Integer JavaDoc)
111         {
112             value = new BigInteger(newValue.toString());
113             value = value.mod(maxValue); // wrap when value exceeds 2^32
114 }
115         else if (newValue instanceof String JavaDoc)
116         {
117             value = value = new BigInteger((String JavaDoc)newValue);
118             value = value.mod(maxValue); // wrap when value exceeds 2^32
119 }
120         else
121             throw new SNMPBadValueException(" Counter32: bad object supplied to set value ");
122     }
123     
124     
125     
126     
127 }
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