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SNMP-Agent API for Java
There is a newer version: 3.8.1
/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - DefaultMOInput.java  
  _## 
  _##  Copyright (C) 2005-2021  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.io;

import java.io.*;

import org.snmp4j.log.*;
import org.snmp4j.smi.*;

public class DefaultMOInput implements MOInput {

    private static final LogAdapter logger = LogFactory.getLogger(DefaultMOInput.class);

    private int importMode;
    private ObjectInputStream ois;

    public DefaultMOInput(ObjectInputStream ois) {
        this.ois = ois;
    }

    public int getImportMode() {
        return importMode;
    }

    public Context readContext() throws IOException {
        try {
            return (Context) ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to load Context: " + ex.getMessage());
            return null;
        }
    }

    public IndexedVariables readIndexedVariables() throws IOException {
        try {
            return (IndexedVariables) ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to load IndexedVariables: " + ex.getMessage());
            return null;
        }
    }

    public MOInfo readManagedObject() throws IOException {
        try {
            return (MOInfo) ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to load MOInfo: " + ex.getMessage());
            return null;
        }
    }

    public Sequence readSequence() throws IOException {
        try {
            return (Sequence) ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to load Sequence: " + ex.getMessage());
            return null;
        }
    }

    public Variable readVariable() throws IOException {
        try {
            return (Variable) ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to load Variable: " + ex.getMessage());
            return null;
        }
    }

    public void skipContext(Context context) throws IOException {
        Object next = null;
        try {
            next = ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to skip Context: " + ex.getMessage());
            next = null;
        }
        while ((!(next instanceof Context)) || (!((Context)next).equals(context))) {
            try {
                next = ois.readObject();
            }
            catch (ClassNotFoundException ex1) {
                logger.error("Failed to skip Context: " + ex1.getMessage());
            }
        }
    }

    public void skipManagedObject(MOInfo moInfo) throws IOException {
        Object next = null;
        try {
            next = ois.readObject();
        }
        catch (ClassNotFoundException ex) {
            logger.error("Failed to skip Context: " + ex.getMessage());
            next = null;
        }
        while ((!(next instanceof MOInfo)) || (!((MOInfo)next).equals(moInfo))) {
            try {
                next = ois.readObject();
            }
            catch (ClassNotFoundException ex1) {
                logger.error("Failed to skip Context: " + ex1.getMessage());
            }
        }
    }

    public void setOverwriteMode(int importMode) {
        this.importMode = importMode;
    }

    public void close() throws IOException {
        ois.close();
    }

}