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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.*;
import java.io.*;
/** Defines an arbitrarily-sized integer value; there is no limit on size due to the use
* of Java.lang.BigInteger to store the value internally. For an indicator which "pegs" at its
* maximum value if initialized with a larger value, use SNMPGauge32; for a counter which wraps,
* use SNMPCounter32 or SNMPCounter64.
* @see snmp.SNMPCounter32
* @see snmp.SNMPGauge32
* @see snmp.SNMPCounter64
*/
public class SNMPInteger extends SNMPObject
{
protected BigInteger value;
protected byte tag = SNMPBERCodec.SNMPINTEGER;
/** Initialize value to 0.
*/
public SNMPInteger()
{
this(0); // initialize value to 0
}
public SNMPInteger(long value)
{
this.value = new BigInteger(new Long(value).toString());
}
/** 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 SNMPInteger(byte[] enc)
throws SNMPBadValueException
{
extractValueFromBEREncoding(enc);
}
/** Returns a java.lang.BigInteger object with the current value.
*/
public Object getValue()
{
return value;
}
/** Used to set the value with an instance of java.lang.Integer or
* java.lang.BigInteger.
* @throws SNMPBadValueException Indicates an incorrect object type supplied.
*/
public void setValue(Object newValue)
throws SNMPBadValueException
{
if (newValue instanceof BigInteger)
value = (BigInteger)newValue;
else if (newValue instanceof Integer)
value = new BigInteger(((Integer)newValue).toString());
else if (newValue instanceof String)
value = new BigInteger((String)newValue);
else
throw new SNMPBadValueException(" Integer: bad object supplied to set value ");
}
/** Returns the full BER encoding (type, length, value) of the SNMPInteger subclass.
*/
public byte[] getBEREncoding()
{
ByteArrayOutputStream outBytes = new ByteArrayOutputStream();
// write contents
// boy, was THIS easy! Love that Java!
BigInteger big = new BigInteger(value.toString());
byte[] data = big.toByteArray();
// calculate encoding for length of data
byte[] len = SNMPBERCodec.encodeLength(data.length);
// encode T,L,V info
outBytes.write(tag);
outBytes.write(len, 0, len.length);
outBytes.write(data, 0, data.length);
return outBytes.toByteArray();
}
/** Used to extract a value from the BER encoding of the value. Called in constructors for
* SNMPInteger subclasses.
* @throws SNMPBadValueException Indicates an invalid BER encoding supplied. Shouldn't
* occur in normal operation, i.e., when valid responses are received from devices.
*/
public void extractValueFromBEREncoding(byte[] enc)
throws SNMPBadValueException
{
try
{
value = new BigInteger(enc);
}
catch (NumberFormatException e)
{
throw new SNMPBadValueException(" Integer: bad BER encoding supplied to set value ");
}
}
public String toString()
{
return new String(value.toString());
}
}
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