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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;
/**
* Object representing the SNMP Null data type.
*/
public class SNMPNull extends SNMPObject
{
protected byte tag = SNMPBERCodec.SNMPNULL;
/**
* Returns Java null reference.
*/
public Object getValue()
{
return null;
}
/**
* Always throws SNMPBadValueException (which null value did you want, anyway?)
*/
public void setValue(Object o)
throws SNMPBadValueException
{
throw new SNMPBadValueException(" Null: attempt to set value ");
}
/**
* Return BER encoding for a null object: two bytes, tag and length of 0.
*/
protected byte[] getBEREncoding()
{
byte[] encoding = new byte[2];
// set tag byte
encoding[0] = SNMPBERCodec.SNMPNULL;
// len = 0 since no payload!
encoding[1] = 0;
// no V!
return encoding;
}
/**
* Checks just that both are instances of SNMPNull (no embedded value to check).
*/
public boolean equals(Object other)
{
// false if other is null
if (other == null)
{
return false;
}
// check that they're both of the same class
if (this.getClass().equals(other.getClass()))
{
return true;
}
else
{
return false;
}
}
/**
* Returns String "Null"..
*/
public String toString()
{
return new String("Null");
}
}
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