source: vbox/trunk/src/libs/xpcom18a4/xpcom/string/public/nsTDependentString.h@ 78394

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla.
 *
 * The Initial Developer of the Original Code is IBM Corporation.
 * Portions created by IBM Corporation are Copyright (C) 2003
 * IBM Corporation. All Rights Reserved.
 *
 * Contributor(s):
 *   Scott Collins <[email protected]> (original author)
 *   Darin Fisher <[email protected]>
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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  /**
   * nsTDependentString_CharT
   *
   * Stores a null-terminated, immutable sequence of characters.
   *
   * Subclass of nsTString that restricts string value to an immutable
   * character sequence.  This class does not own its data, so the creator
   * of objects of this type must take care to ensure that a
   * nsTDependentString continues to reference valid memory for the
   * duration of its use.
   */
class nsTDependentString_CharT : public nsTString_CharT
  {
    public:

      typedef nsTDependentString_CharT    self_type;

    public:

        /**
         * verify restrictions
         */
      void AssertValid()
        {
          NS_ASSERTION(mData, "nsTDependentString must wrap a non-NULL buffer");
          NS_ASSERTION(mLength != size_type(-1), "nsTDependentString has bogus length");
          NS_ASSERTION(mData[mLength] == 0, "nsTDependentString must wrap only null-terminated strings");
        }


        /**
         * constructors
         */

      nsTDependentString_CharT( const char_type* start, const char_type* end )
        : string_type(NS_CONST_CAST(char_type*, start), end - start, F_TERMINATED)
        {
          AssertValid();
        }

      nsTDependentString_CharT( const char_type* data, PRUint32 length )
        : string_type(NS_CONST_CAST(char_type*, data), length, F_TERMINATED)
        {
          AssertValid();
        }

      explicit
      nsTDependentString_CharT( const char_type* data )
        : string_type(NS_CONST_CAST(char_type*, data), char_traits::length(data), F_TERMINATED)
        {
          AssertValid();
        }

      explicit
      nsTDependentString_CharT( const substring_type& str )
        : string_type(NS_CONST_CAST(char_type*, str.Data()), str.Length(), F_TERMINATED)
        {
          AssertValid();
        }

      // XXX are you sure??
      // auto-generated copy-constructor OK
      // auto-generated copy-assignment operator OK
      // auto-generated destructor OK


        /**
         * allow this class to be bound to a different string...
         */

      void Rebind( const char_type* data )
        {
          mData = NS_CONST_CAST(char_type*, data);
          mLength = char_traits::length(data);
          SetDataFlags(F_TERMINATED);
          AssertValid();
        }

      void Rebind( const char_type* data, size_type length )
        {
          mData = NS_CONST_CAST(char_type*, data);
          mLength = length;
          SetDataFlags(F_TERMINATED);
          AssertValid();
        }

      void Rebind( const char_type* start, const char_type* end )
        {
          Rebind(start, end - start);
        }

    private:
      
      // NOT USED
      nsTDependentString_CharT( const substring_tuple_type& );
      nsTDependentString_CharT( const abstract_string_type& );
  };