/* AnonymousUtil.java -- 
   Copyright (C) 2003, 2006 Free Software Foundation, Inc.

This file is a part of GNU Classpath.

GNU Classpath is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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your option) any later version.

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WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
General Public License for more details.

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along with GNU Classpath; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
USA

Linking this library statically or dynamically with other modules is
making a combined work based on this library.  Thus, the terms and
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combination.

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permission to link this library with independent modules to produce an
executable, regardless of the license terms of these independent
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package gnu.javax.crypto.sasl.anonymous;

import gnu.javax.crypto.sasl.SaslUtil;

/**
 * An ANONYMOUS-specific utility class.
 */
public class AnonymousUtil
{
  /** Trivial private constructor to enforce Singleton pattern. */
  private AnonymousUtil()
  {
    super();
  }

  static boolean isValidTraceInformation(String traceInformation)
  {
    if (traceInformation == null)
      return false;
    if (traceInformation.length() == 0)
      return true;
    if (SaslUtil.validEmailAddress(traceInformation))
      return true;
    return isValidToken(traceInformation);
  }

  static boolean isValidToken(String token)
  {
    if (token == null)
      return false;
    if (token.length() == 0)
      return false;
    if (token.length() > 255)
      return false;
    if (token.indexOf('@') != -1)
      return false;
    for (int i = 0; i < token.length(); i++)
      {
        char c = token.charAt(i);
        if (c < 0x20 || c > 0x7E)
          return false;
      }
    return true;
  }
}