unsignedinteger32.java

snmp4j

/*_############################################################################
  _##
  _##  SNMP4J - UnsignedInteger32.java
  _##
  _##  Copyright 2003-2005  Frank Fock and Jochen Katz (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.smi;

import java.io.*;
import org.snmp4j.asn1.BER;
import org.snmp4j.asn1.BERInputStream;

/**
 * UnsignedInteger32 type is an SNMP type that represents unsigned 32bit
 * integer values (0 to 4294967295).
 * @author Frank Fock
 * @version 1.0
 */

public class UnsignedInteger32 extends Variable {

  static final long serialVersionUID = -2155365655395258383L;

  protected long value = 0;

  public UnsignedInteger32() {
  }

  /**
   * Creates an <code>UnsignedInteger32</code> from a <code>long</code> value.
   * @param value
   *    a <code>long</code> value which must not be greater 2^32-1 and not less
   *    zero.
   * @throws IllegalArgumentException
   *    if <code>value</code> &lt; 0 or &gt; 2^32-1.
   */
  public UnsignedInteger32(long value) {
    setValue(value);
  }

  public void encodeBER(OutputStream outputStream) throws java.io.IOException {
    BER.encodeUnsignedInteger(outputStream, BER.GAUGE, value);
  }

  public void decodeBER(BERInputStream inputStream) throws java.io.IOException {
    BER.MutableByte type = new BER.MutableByte();
    long newValue = BER.decodeUnsignedInteger(inputStream, type);
    if (type.getValue() != BER.GAUGE) {
      throw new IOException("Wrong type encountered when decoding Gauge: "+type.getValue());
    }
    setValue(newValue);
  }

  public int getSyntax() {
    return SMIConstants.SYNTAX_UNSIGNED_INTEGER32;
  }

  public int hashCode() {
    return (int)value;
  }

  public int getBERLength() {
    if (value < 0x80L) {
      return 3;
    }
    else if (value < 0x8000L) {
      return 4;
    }
    else if (value < 0x800000L) {
      return 5;
    }
    else if (value < 0x80000000L) {
      return 6;
    }
    return 7;
  }

  public boolean equals(Object o) {
    if (o instanceof UnsignedInteger32) {
      return (((UnsignedInteger32)o).value == value);
    }
    return false;
  }

  public int compareTo(Object o) {
    long diff = (value - ((UnsignedInteger32)o).getValue());
    if (diff < 0) {
      return -1;
    }
    else if (diff > 0) {
      return 1;
    }
    return 0;
  }

  public String toString() {
    return Long.toString(value);
  }

  public void setValue(long value) {
    if ((value < 0) || (value > 4294967295l)) {
      throw new IllegalArgumentException(
          "Argument must be an unsigned 32bit value");
    }
    this.value = value;
  }

  public long getValue() {
    return value;
  }

  public Object clone() {
    return new UnsignedInteger32(value);
  }

}