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      1 // Copyright (c) 1999-2004 Brian Wellington (bwelling (at) xbill.org)
      2 
      3 package org.xbill.DNS;
      4 
      5 import java.util.*;
      6 
      7 /**
      8  * Boolean options:<BR>
      9  * bindttl - Print TTLs in BIND format<BR>
     10  * multiline - Print records in multiline format<BR>
     11  * noprintin - Don't print the class of a record if it's IN<BR>
     12  * verbose - Turn on general debugging statements<BR>
     13  * verbosemsg - Print all messages sent or received by SimpleResolver<BR>
     14  * verbosecompression - Print messages related to name compression<BR>
     15  * verbosesec - Print messages related to signature verification<BR>
     16  * verbosecache - Print messages related to cache lookups<BR>
     17  * <BR>
     18  * Valued options:<BR>
     19  * tsigfudge=n - Sets the default TSIG fudge value (in seconds)<BR>
     20  * sig0validity=n - Sets the default SIG(0) validity period (in seconds)<BR>
     21  *
     22  * @author Brian Wellington
     23  */
     24 
     25 public final class Options {
     26 
     27 private static Map table;
     28 
     29 static {
     30 	try {
     31 		refresh();
     32 	}
     33 	catch (SecurityException e) {
     34 	}
     35 }
     36 
     37 private
     38 Options() {}
     39 
     40 public static void
     41 refresh() {
     42 	String s = System.getProperty("dnsjava.options");
     43 	if (s != null) {
     44 		StringTokenizer st = new StringTokenizer(s, ",");
     45 		while (st.hasMoreTokens()) {
     46 			String token = st.nextToken();
     47 			int index = token.indexOf('=');
     48 			if (index == -1)
     49 				set(token);
     50 			else {
     51 				String option = token.substring(0, index);
     52 				String value = token.substring(index + 1);
     53 				set(option, value);
     54 			}
     55 		}
     56 	}
     57 }
     58 
     59 /** Clears all defined options */
     60 public static void
     61 clear() {
     62 	table = null;
     63 }
     64 
     65 /** Sets an option to "true" */
     66 public static void
     67 set(String option) {
     68 	if (table == null)
     69 		table = new HashMap();
     70 	table.put(option.toLowerCase(), "true");
     71 }
     72 
     73 /** Sets an option to the the supplied value */
     74 public static void
     75 set(String option, String value) {
     76 	if (table == null)
     77 		table = new HashMap();
     78 	table.put(option.toLowerCase(), value.toLowerCase());
     79 }
     80 
     81 /** Removes an option */
     82 public static void
     83 unset(String option) {
     84 	if (table == null)
     85 		return;
     86 	table.remove(option.toLowerCase());
     87 }
     88 
     89 /** Checks if an option is defined */
     90 public static boolean
     91 check(String option) {
     92 	if (table == null)
     93 		return false;
     94 	return (table.get(option.toLowerCase()) != null);
     95 }
     96 
     97 /** Returns the value of an option */
     98 public static String
     99 value(String option) {
    100 	if (table == null)
    101 		return null;
    102 	return ((String)table.get(option.toLowerCase()));
    103 }
    104 
    105 /**
    106  * Returns the value of an option as an integer, or -1 if not defined.
    107  */
    108 public static int
    109 intValue(String option) {
    110 	String s = value(option);
    111 	if (s != null) {
    112 		try {
    113 			int val = Integer.parseInt(s);
    114 			if (val > 0)
    115 				return (val);
    116 		}
    117 		catch (NumberFormatException e) {
    118 		}
    119 	}
    120 	return (-1);
    121 }
    122 
    123 }
    124