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/*_############################################################################
  _## 
  _##  SNMP4J-Agent - TruthValueTC.java  
  _## 
  _##  Copyright (C) 2005-2009  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.tc;

import org.snmp4j.agent.*;
import org.snmp4j.agent.mo.*;
import org.snmp4j.smi.*;
import org.snmp4j.agent.mo.snmp.smi.EnumerationConstraint;
import org.snmp4j.agent.mo.snmp.smi.ValueConstraintValidator;
import org.snmp4j.mp.SnmpConstants;

public class TruthValueTC implements TextualConvention {

  public static final int TRUE = 1;
  public static final int FALSE = 2;

  private EnumerationConstraint constraint =
      new EnumerationConstraint(new int[] { TRUE, FALSE });

  public TruthValueTC() {
  }

  public MOColumn createColumn(int columnID, int syntax, MOAccess access,
                               Variable defaultValue,
                               boolean mutableInService) {
    MOColumn c;
    if (access.isAccessibleForWrite()) {
      c = new MOMutableColumn(columnID, SMIConstants.SYNTAX_INTEGER32,
                              access, defaultValue);
      ((MOMutableColumn)c).addMOValueValidationListener(
          new ValueConstraintValidator(constraint));
    }
    else {
      c = new MOColumn(columnID, SMIConstants.SYNTAX_INTEGER32, access);
    }
    return c;
  }

  public MOScalar createScalar(OID oid, MOAccess access, Variable value) {
    MOScalar scalar =
        new MOScalar(oid, access, (value == null) ? createInitialValue() : value);
    if (constraint.validate(scalar.getValue()) !=
        SnmpConstants.SNMP_ERROR_SUCCESS) {
      throw new IllegalArgumentException("Illegal TruthValue "+value);
    }
    scalar.
        addMOValueValidationListener(new ValueConstraintValidator(constraint));
    return scalar;
  }

  public String getModuleName() {
    return "SNMPv2-TC";
  }

  public String getName() {
    return "TruthValue";
  }

  public final static Integer32 getValue(boolean b) {
    return (b) ? new Integer32(TRUE) : new Integer32(FALSE);
  }

  public Variable createInitialValue() {
    return new Integer32(FALSE);
  }
}