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Java > Open Source Codes > snmp > SNMPCounter64


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 /** Defines a 64-bit counter, whose value wraps if initialized with a larger
38 * value. For an indicator which "pegs" at its maximum value if initialized with
39 * a larger value, use SNMPGauge32; for a counter with a smaller range, use SNMPCounter32.
40 * @see snmp.SNMPGauge32
41 * @see snmp.SNMPCounter32
42 */

43
44
45 public class SNMPCounter64 extends SNMPInteger
46 {
47     // maximum value is 2^64 - 1; using approximation!!
48
private static BigInteger maxValue = new BigInteger("18446744070000000000");
49     
50     
51     /** Initialize value to 0.
52     */

53     
54     public SNMPCounter64()
55     {
56         this(0); // initialize value to 0
57
}
58     
59     
60     public SNMPCounter64(long newValue)
61     {
62         tag = SNMPBERCodec.SNMPCOUNTER64;
63         
64         value = new BigInteger(new Long JavaDoc(newValue).toString());
65         
66         // wrap if value > maxValue
67
value = value.mod(maxValue);
68     }
69     
70     
71     
72     
73     /** Used to initialize from the BER encoding, usually received in a response from
74     * an SNMP device responding to an SNMPGetRequest.
75     * @throws SNMPBadValueException Indicates an invalid BER encoding supplied. Shouldn't
76     * occur in normal operation, i.e., when valid responses are received from devices.
77     */

78     
79     protected SNMPCounter64(byte[] enc)
80         throws SNMPBadValueException
81     {
82         tag = SNMPBERCodec.SNMPCOUNTER64;
83         
84         extractValueFromBEREncoding(enc);
85         
86         // wrap if value > maxValue
87
value = value.mod(maxValue);
88     }
89     
90     
91     
92     /** Used to set the value with an instance of java.lang.Integer or
93     * java.lang.BigInteger. The value of the constructed SNMPCounter64 object is the
94     * supplied value mod 2^64.
95     * @throws SNMPBadValueException Indicates an incorrect object type supplied.
96     */

97     
98     
99     public void setValue(Object JavaDoc newValue)
100         throws SNMPBadValueException
101     {
102         if (newValue instanceof BigInteger)
103         {
104             value = (BigInteger)newValue;
105             value = value.mod(maxValue); // wrap when value exceeds 2^64
106
}
107         else if (newValue instanceof Integer JavaDoc)
108         {
109             value = value = new BigInteger(newValue.toString());
110             value = value.mod(maxValue); // wrap when value exceeds 2^64
111
}
112         else if (newValue instanceof String JavaDoc)
113         {
114             value = value = new BigInteger((String JavaDoc)newValue);
115             value = value.mod(maxValue); // wrap when value exceeds 2^64
116
}
117         else
118             throw new SNMPBadValueException(" Counter64: bad object supplied to set value ");
119     }
120     
121     
122     
123     
124 }
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