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There is a newer version: 3.6.2_1

// SPDX-License-Identifier: BSD-2-Clause
// Copyright (c) 1999-2004 Brian Wellington ([email protected])

package org.xbill.DNS;

/**
 * Constants and functions relating to DNS opcodes
 *
 * @author Brian Wellington
 */
public final class Opcode {

  /** A standard query */
  public static final int QUERY = 0;

  /** An inverse query (deprecated) */
  public static final int IQUERY = 1;

  /** A server status request (not used) */
  public static final int STATUS = 2;

  /** A message from a primary to a secondary server to initiate a zone transfer */
  public static final int NOTIFY = 4;

  /** A dynamic update message */
  public static final int UPDATE = 5;

  /** DNS Stateful Operations (DSO, RFC8490) */
  public static final int DSO = 6;

  private static Mnemonic opcodes = new Mnemonic("DNS Opcode", Mnemonic.CASE_UPPER);

  static {
    opcodes.setMaximum(0xF);
    opcodes.setPrefix("RESERVED");
    opcodes.setNumericAllowed(true);

    opcodes.add(QUERY, "QUERY");
    opcodes.add(IQUERY, "IQUERY");
    opcodes.add(STATUS, "STATUS");
    opcodes.add(NOTIFY, "NOTIFY");
    opcodes.add(UPDATE, "UPDATE");
    opcodes.add(DSO, "DSO");
  }

  private Opcode() {}

  /** Converts a numeric Opcode into a String */
  public static String string(int i) {
    return opcodes.getText(i);
  }

  /** Converts a String representation of an Opcode into its numeric value */
  public static int value(String s) {
    return opcodes.getValue(s);
  }
}