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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.*;
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());
}
public SNMPInteger(BigInteger value)
{
this.value = value;
}
/** 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 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.
*/
protected byte[] getBEREncoding()
{
ByteArrayOutputStream outBytes = new ByteArrayOutputStream();
// write contents
// boy, was THIS easy! Love that Java!
byte[] data = value.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 value.toString();
// return new String(value.toString());
}
public String toString(int radix)
{
return value.toString(radix);
// return new String(value.toString());
}
}
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