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The official Couchbase JVM Core IO Library
There is a newer version: 3.7.2
// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 1999-2004 Brian Wellington ([email protected])

package com.couchbase.client.core.deps.org.xbill.DNS;

import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;

/**
 * Configuration options for dnsjava.
 *
 * Boolean options:
 *
 * 

 *   BINDTTL - Print TTLs in BIND format
 *   
multiline - Print records in multiline format

 *   
noPrintIN - Don't print the class of a record if it's IN

 * 
 *
 * Valued options:
 *
 * 

 *   tsigfudge=n - Sets the default TSIG fudge value (in seconds)
 *   
sig0validity=n - Sets the default SIG(0) validity period (in seconds)
 * 
 *
 * @author Brian Wellington
 */
public final class Options {

  private static Map table;

  static {
    try {
      refresh();
    } catch (SecurityException e) {
    }
  }

  private Options() {}

  public static void refresh() {
    String s = System.getProperty("dnsjava.options");
    if (s != null) {
      StringTokenizer st = new StringTokenizer(s, ",");
      while (st.hasMoreTokens()) {
        String token = st.nextToken();
        int index = token.indexOf('=');
        if (index == -1) {
          set(token);
        } else {
          String option = token.substring(0, index);
          String value = token.substring(index + 1);
          set(option, value);
        }
      }
    }
  }

  /** Clears all defined options */
  public static void clear() {
    table = null;
  }

  /** Sets an option to "true" */
  public static void set(String option) {
    if (table == null) {
      table = new HashMap<>();
    }
    table.put(option.toLowerCase(), "true");
  }

  /** Sets an option to the the supplied value */
  public static void set(String option, String value) {
    if (table == null) {
      table = new HashMap<>();
    }
    table.put(option.toLowerCase(), value.toLowerCase());
  }

  /** Removes an option */
  public static void unset(String option) {
    if (table == null) {
      return;
    }
    table.remove(option.toLowerCase());
  }

  /** Checks if an option is defined */
  public static boolean check(String option) {
    if (table == null) {
      return false;
    }
    return table.get(option.toLowerCase()) != null;
  }

  /** Returns the value of an option */
  public static String value(String option) {
    if (table == null) {
      return null;
    }
    return table.get(option.toLowerCase());
  }

  /** Returns the value of an option as an integer, or -1 if not defined. */
  public static int intValue(String option) {
    String s = value(option);
    if (s != null) {
      try {
        int val = Integer.parseInt(s);
        if (val > 0) {
          return val;
        }
      } catch (NumberFormatException e) {
      }
    }
    return -1;
  }
}