/*_############################################################################
  _## 
  _##  SNMP4J-Agent 3 - ConstraintsImpl.java  
  _## 
  _##  Copyright (C) 2005-2025  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.smi;

import java.util.ArrayList;
import java.util.List;
import java.util.*;

import org.snmp4j.smi.Variable;
import org.snmp4j.PDU;
import org.snmp4j.smi.OctetString;
import org.snmp4j.smi.UnsignedInteger32;
import org.snmp4j.smi.Integer32;

/**
 * The <code>ConstraintsImpl</code> class represents a collection of constraints that are applied to a SNMP value in the
 * order they have been added to this constraints collection.
 *
 * @author Frank Fock
 * @version 1.0
 */
public class ConstraintsImpl implements Constraints {

    private List<Constraint> constraints = new ArrayList<Constraint>();

    /**
     * Creates a new constraints collection.
     */
    public ConstraintsImpl() {
    }

    public void add(Constraint sizeConstraint) {
        constraints.add(sizeConstraint);
    }

    public void remove(Constraint sizeContraint) {
        constraints.remove(sizeContraint);
    }

    public Constraint[] getConstraints() {
        return constraints.toArray(new Constraint[0]);
    }

    public boolean isValidSize(long size) {
        if (constraints.size() > 0) {
            for (Constraint sc : constraints) {
                if ((size >= sc.getLowerBound()) && (size <= sc.getUpperBound())) {
                    return true;
                }
            }
            return false;
        } else {
            return true;
        }
    }

    public int validate(Variable variable) {
        if (variable instanceof OctetString) {
            if (!isValidSize(((OctetString) variable).length())) {
                return PDU.wrongLength;
            }
        } else if (variable instanceof Integer32) {
            Integer32 i = (Integer32) variable;
            if (!isValidSize(i.getValue())) {
                return PDU.wrongValue;
            }
        } else if (variable instanceof UnsignedInteger32) {
            UnsignedInteger32 ui = (UnsignedInteger32) variable;
            if (!isValidSize(ui.getValue())) {
                return PDU.wrongValue;
            }
        }
        return PDU.noError;
    }

}
