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SNMP-Agent API for Java
There is a newer version: 3.8.1
/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - SnmpAdminString.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.*;
import org.snmp4j.agent.mo.*;
import org.snmp4j.smi.*;
import org.snmp4j.mp.SnmpConstants;

public class SnmpAdminString extends MOMutableColumn {

    private int minLength = 0;
    private int maxLength = 255;

    public SnmpAdminString(int columnID,
                           MOAccess access,
                           OctetString defaultValue,
                           boolean mutableInService) {
        super(columnID, SMIConstants.SYNTAX_OCTET_STRING,
                access, defaultValue, mutableInService);
    }

    public SnmpAdminString(int columnID,
                           MOAccess access,
                           OctetString defaultValue,
                           boolean mutableInService,
                           int minLength,
                           int maxLength) {
        super(columnID, SMIConstants.SYNTAX_OCTET_STRING,
                access, defaultValue, mutableInService);
        setMinLength(minLength);
        setMaxLength(maxLength);
    }

    public int getMaxLength() {
        return maxLength;
    }

    public int getMinLength() {
        return minLength;
    }

    public void setMaxLength(int maxLength) {
        this.maxLength = maxLength;
    }

    public void setMinLength(int minLength) {
        this.minLength = minLength;
    }

    public synchronized int validate(OctetString newValue, OctetString oldValue) {
        if ((newValue.length() < minLength) || (newValue.length() > maxLength)) {
            return SnmpConstants.SNMP_ERROR_WRONG_LENGTH;
        }
        return super.validate(newValue, oldValue);
    }

}