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SNMP-Agent API for Java
There is a newer version: 3.8.1
/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - TestAndIncr.java  
  _## 
  _##  Copyright (C) 2005-2018  Frank Fock (SNMP4J.org)
  _##  
  _##  Licensed under the Apache License, Version 2.0 (the "License");
  _##  you may not use this file except in compliance with the License.
  _##  You may obtain a copy of the License at
  _##  
  _##      http://www.apache.org/licenses/LICENSE-2.0
  _##  
  _##  Unless required by applicable law or agreed to in writing, software
  _##  distributed under the License is distributed on an "AS IS" BASIS,
  _##  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  _##  See the License for the specific language governing permissions and
  _##  limitations under the License.
  _##  
  _##########################################################################*/

package org.snmp4j.agent.mo.snmp;

import org.snmp4j.agent.mo.MOScalar;
import org.snmp4j.agent.mo.MOAccessImpl;
import org.snmp4j.smi.Integer32;
import org.snmp4j.smi.OID;
import org.snmp4j.agent.request.SubRequest;
import org.snmp4j.mp.SnmpConstants;
import org.snmp4j.agent.request.RequestStatus;

public class TestAndIncr extends MOScalar {

    public TestAndIncr(OID oid) {
        super(oid, MOAccessImpl.ACCESS_READ_WRITE, new Integer32(0));
    }

    public void commit(SubRequest request) {
        Integer32 requestValue =
                (Integer32) request.getVariableBinding().getVariable();
        int v = requestValue.getValue();
        if (v == Integer.MAX_VALUE) {
            v = 0;
        } else {
            v++;
        }
        request.getVariableBinding().setVariable(new Integer32(v));
        super.commit(request);
        request.getVariableBinding().setVariable(requestValue);
    }

    public void prepare(SubRequest request) {
        super.prepare(request);
        if (!request.hasError()) {
            Integer32 value = (Integer32) request.getVariableBinding().getVariable();
            if (!getValue().equals(value)) {
                request.getStatus().setErrorStatus(SnmpConstants.SNMP_ERROR_INCONSISTENT_VALUE);
            }
        }
    }

    public int isValueOK(SubRequest request) {
        Integer32 value = (Integer32) request.getVariableBinding().getVariable();
        if (value.getValue() < 0) {
            return SnmpConstants.SNMP_ERROR_WRONG_VALUE;
        }
        return SnmpConstants.SNMP_ERROR_SUCCESS;
    }

}