01: /*
02: * SNMP Package
03: *
04: * Copyright (C) 2004, Jonathan Sevy <jsevy@mcs.drexel.edu>
05: *
06: * This is free software. Redistribution and use in source and binary forms, with
07: * or without modification, are permitted provided that the following conditions
08: * are met:
09: *
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: package snmp;
31:
32: import java.math.*;
33:
34: /**
35: * Defines a 32-bit counter, whose value wraps if initialized with a larger
36: * value. For an indicator which "pegs" at its maximum value if initialized with
37: * a larger value, use SNMPGauge32; for a counter with a wider range, use SNMPCounter64.
38: * @see snmp.SNMPGauge32
39: * @see snmp.SNMPCounter64
40: */
41:
42: public class SNMPCounter32 extends SNMPInteger {
43: // maximum value is 2^32 - 1
44: private static BigInteger maxValue = new BigInteger("4294967295");
45:
46: /** Initialize value to 0.
47: */
48:
49: public SNMPCounter32() {
50: this (0); // initialize value to 0
51: }
52:
53: public SNMPCounter32(long newValue) {
54: tag = SNMPBERCodec.SNMPCOUNTER32;
55:
56: value = new BigInteger(new Long(newValue).toString());
57:
58: // wrap if value > maxValue
59: value = value.mod(maxValue);
60: }
61:
62: /** Used to initialize from the BER encoding, usually received in a response from
63: * an SNMP device responding to an SNMPGetRequest.
64: * @throws SNMPBadValueException Indicates an invalid BER encoding supplied. Shouldn't
65: * occur in normal operation, i.e., when valid responses are received from devices.
66: */
67:
68: protected SNMPCounter32(byte[] enc) throws SNMPBadValueException {
69: tag = SNMPBERCodec.SNMPCOUNTER32;
70:
71: extractValueFromBEREncoding(enc);
72:
73: // wrap if value > maxValue
74: value = value.mod(maxValue);
75: }
76:
77: /** Used to set the value with an instance of java.lang.Integer or
78: * java.lang.BigInteger. The value of the constructed SNMPCounter32 object is the
79: * supplied value mod 2^32.
80: * @throws SNMPBadValueException Indicates an incorrect object type supplied.
81: */
82:
83: public void setValue(Object newValue) throws SNMPBadValueException {
84: if (newValue instanceof BigInteger) {
85: value = (BigInteger) newValue;
86: value = value.mod(maxValue); // wrap when value exceeds 2^32
87: } else if (newValue instanceof Integer) {
88: value = new BigInteger(newValue.toString());
89: value = value.mod(maxValue); // wrap when value exceeds 2^32
90: } else if (newValue instanceof String) {
91: value = value = new BigInteger((String) newValue);
92: value = value.mod(maxValue); // wrap when value exceeds 2^32
93: } else
94: throw new SNMPBadValueException(
95: " Counter32: bad object supplied to set value ");
96: }
97:
98: }
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