Source for gnu.javax.crypto.sasl.anonymous.AnonymousUtil

   1: /* AnonymousUtil.java --
   2:    Copyright (C) 2003, 2006 Free Software Foundation, Inc.
   3: 
   4: This file is a part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2 of the License, or (at
   9: your option) any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; if not, write to the Free Software
  18: Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
  19: USA
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version.  */
  37: 
  38: 
  39: package gnu.javax.crypto.sasl.anonymous;
  40: 
  41: import gnu.javax.crypto.sasl.SaslUtil;
  42: 
  43: /**
  44:  * An ANONYMOUS-specific utility class.
  45:  */
  46: public class AnonymousUtil
  47: {
  48:   /** Trivial private constructor to enforce Singleton pattern. */
  49:   private AnonymousUtil()
  50:   {
  51:     super();
  52:   }
  53: 
  54:   static boolean isValidTraceInformation(String traceInformation)
  55:   {
  56:     if (traceInformation == null)
  57:       return false;
  58:     if (traceInformation.length() == 0)
  59:       return true;
  60:     if (SaslUtil.validEmailAddress(traceInformation))
  61:       return true;
  62:     return isValidToken(traceInformation);
  63:   }
  64: 
  65:   static boolean isValidToken(String token)
  66:   {
  67:     if (token == null)
  68:       return false;
  69:     if (token.length() == 0)
  70:       return false;
  71:     if (token.length() > 255)
  72:       return false;
  73:     if (token.indexOf('@') != -1)
  74:       return false;
  75:     for (int i = 0; i < token.length(); i++)
  76:       {
  77:         char c = token.charAt(i);
  78:         if (c < 0x20 || c > 0x7E)
  79:           return false;
  80:       }
  81:     return true;
  82:   }
  83: }