1 // Copyright (c) 1999-2004 Brian Wellington (bwelling (at) xbill.org) 2 3 package org.xbill.DNS; 4 5 /** 6 * Constants and functions relating to DNS opcodes 7 * 8 * @author Brian Wellington 9 */ 10 11 public final class Opcode { 12 13 /** A standard query */ 14 public static final int QUERY = 0; 15 16 /** An inverse query (deprecated) */ 17 public static final int IQUERY = 1; 18 19 /** A server status request (not used) */ 20 public static final int STATUS = 2; 21 22 /** 23 * A message from a primary to a secondary server to initiate a zone transfer 24 */ 25 public static final int NOTIFY = 4; 26 27 /** A dynamic update message */ 28 public static final int UPDATE = 5; 29 30 private static Mnemonic opcodes = new Mnemonic("DNS Opcode", 31 Mnemonic.CASE_UPPER); 32 33 static { 34 opcodes.setMaximum(0xF); 35 opcodes.setPrefix("RESERVED"); 36 opcodes.setNumericAllowed(true); 37 38 opcodes.add(QUERY, "QUERY"); 39 opcodes.add(IQUERY, "IQUERY"); 40 opcodes.add(STATUS, "STATUS"); 41 opcodes.add(NOTIFY, "NOTIFY"); 42 opcodes.add(UPDATE, "UPDATE"); 43 } 44 45 private 46 Opcode() {} 47 48 /** Converts a numeric Opcode into a String */ 49 public static String 50 string(int i) { 51 return opcodes.getText(i); 52 } 53 54 /** Converts a String representation of an Opcode into its numeric value */ 55 public static int 56 value(String s) { 57 return opcodes.getValue(s); 58 } 59 60 } 61
