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/*
* AirportBaseStationConfigurator
*
* Copyright (C) 2000, Jonathan Sevy <jsevy@mcs.drexel.edu>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
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");
protected byte tag = SNMPBERCodec.SNMPCOUNTER32;
/** Initialize value to 0.
*/
public SNMPCounter32()
{
this(0); // initialize value to 0
}
public SNMPCounter32(long newValue)
{
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.
*/
public SNMPCounter32(byte[] enc)
throws SNMPBadValueException
{
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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