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/*
* SNMP Package
*
* Copyright (C) 2004, 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;
import java.math.*;
/**
* Defines a 32-bit counter, whose value wraps if initialized with a larger
* value. For an indicator which "pegs" at its maximum value if initialized with
* a larger value, use SNMPGauge32; for a counter with a wider range, use SNMPCounter64.
* @see snmp.SNMPGauge32
* @see snmp.SNMPCounter64
*/
public class SNMPCounter32 extends SNMPInteger
{
// maximum value is 2^32 - 1
private static BigInteger maxValue = new BigInteger("4294967295");
/** Initialize value to 0.
*/
public SNMPCounter32()
{
this(0); // initialize value to 0
}
public SNMPCounter32(long newValue)
{
tag = SNMPBERCodec.SNMPCOUNTER32;
value = new BigInteger(new Long(newValue).toString());
// wrap if value > maxValue
value = value.mod(maxValue);
}
/** Used to initialize from the BER encoding, usually received in a response from
* an SNMP device responding to an SNMPGetRequest.
* @throws SNMPBadValueException Indicates an invalid BER encoding supplied. Shouldn't
* occur in normal operation, i.e., when valid responses are received from devices.
*/
protected SNMPCounter32(byte[] enc)
throws SNMPBadValueException
{
tag = SNMPBERCodec.SNMPCOUNTER32;
extractValueFromBEREncoding(enc);
// wrap if value > maxValue
value = value.mod(maxValue);
}
/** Used to set the value with an instance of java.lang.Integer or
* java.lang.BigInteger. The value of the constructed SNMPCounter32 object is the
* supplied value mod 2^32.
* @throws SNMPBadValueException Indicates an incorrect object type supplied.
*/
public void setValue(Object newValue)
throws SNMPBadValueException
{
if (newValue instanceof BigInteger)
{
value = (BigInteger)newValue;
value = value.mod(maxValue); // wrap when value exceeds 2^32
}
else if (newValue instanceof Integer)
{
value = new BigInteger(newValue.toString());
value = value.mod(maxValue); // wrap when value exceeds 2^32
}
else if (newValue instanceof String)
{
value = value = new BigInteger((String)newValue);
value = value.mod(maxValue); // wrap when value exceeds 2^32
}
else
throw new SNMPBadValueException(" Counter32: bad object supplied to set value ");
}
}
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