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 message sections 7 * 8 * @author Brian Wellington 9 */ 10 11 public final class Section { 12 13 /** The question (first) section */ 14 public static final int QUESTION = 0; 15 16 /** The answer (second) section */ 17 public static final int ANSWER = 1; 18 19 /** The authority (third) section */ 20 public static final int AUTHORITY = 2; 21 22 /** The additional (fourth) section */ 23 public static final int ADDITIONAL = 3; 24 25 /* Aliases for dynamic update */ 26 /** The zone (first) section of a dynamic update message */ 27 public static final int ZONE = 0; 28 29 /** The prerequisite (second) section of a dynamic update message */ 30 public static final int PREREQ = 1; 31 32 /** The update (third) section of a dynamic update message */ 33 public static final int UPDATE = 2; 34 35 private static Mnemonic sections = new Mnemonic("Message Section", 36 Mnemonic.CASE_LOWER); 37 private static String [] longSections = new String[4]; 38 private static String [] updateSections = new String[4]; 39 40 static { 41 sections.setMaximum(3); 42 sections.setNumericAllowed(true); 43 44 sections.add(QUESTION, "qd"); 45 sections.add(ANSWER, "an"); 46 sections.add(AUTHORITY, "au"); 47 sections.add(ADDITIONAL, "ad"); 48 49 longSections[QUESTION] = "QUESTIONS"; 50 longSections[ANSWER] = "ANSWERS"; 51 longSections[AUTHORITY] = "AUTHORITY RECORDS"; 52 longSections[ADDITIONAL] = "ADDITIONAL RECORDS"; 53 54 updateSections[ZONE] = "ZONE"; 55 updateSections[PREREQ] = "PREREQUISITES"; 56 updateSections[UPDATE] = "UPDATE RECORDS"; 57 updateSections[ADDITIONAL] = "ADDITIONAL RECORDS"; 58 } 59 60 private 61 Section() {} 62 63 /** Converts a numeric Section into an abbreviation String */ 64 public static String 65 string(int i) { 66 return sections.getText(i); 67 } 68 69 /** Converts a numeric Section into a full description String */ 70 public static String 71 longString(int i) { 72 sections.check(i); 73 return longSections[i]; 74 } 75 76 /** 77 * Converts a numeric Section into a full description String for an update 78 * Message. 79 */ 80 public static String 81 updString(int i) { 82 sections.check(i); 83 return updateSections[i]; 84 } 85 86 /** Converts a String representation of a Section into its numeric value */ 87 public static int 88 value(String s) { 89 return sections.getValue(s); 90 } 91 92 } 93
