svl/source/misc/sharedstring.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  */
   9
  10 #include <svl/sharedstring.hxx>
  11
  12 namespace svl {
  13
  14 const OUString SharedString::EMPTY_STRING;
  15
  16 const SharedString & SharedString::getEmptyString()
  17 {
  18     // ref-counting traffic associated with SharedString temporaries can be significant,
  19     // so use a singleton here, so we can return a const& from getEmptyString.
  20     // unicode string array for empty string is globally shared in OUString.
  21     // Let's take advantage of that.
  22     static const SharedString EMPTY_SHARED_STRING(EMPTY_STRING.pData, EMPTY_STRING.pData);
  23     return EMPTY_SHARED_STRING;
  24 }
  25
  26 SharedString& SharedString::operator= ( const SharedString& r )
  27 {
  28     if(this == &r)
  29         return *this;
  30
  31     if (mpData)
  32         rtl_uString_release(mpData);
  33     if (mpDataIgnoreCase)
  34         rtl_uString_release(mpDataIgnoreCase);
  35
  36     mpData = r.mpData;
  37     mpDataIgnoreCase = r.mpDataIgnoreCase;
  38
  39     if (mpData)
  40         rtl_uString_acquire(mpData);
  41     if (mpDataIgnoreCase)
  42         rtl_uString_acquire(mpDataIgnoreCase);
  43
  44     return *this;
  45 }
  46
  47 bool SharedString::operator== ( const SharedString& r ) const
  48 {
  49     // Compare only the original (not case-folded) string.
  50
  51     if (mpData == r.mpData)
  52         return true;
  53
  54     if (!mpData || !r.mpData)
  55         return false;
  56
  57     if (mpData->length != r.mpData->length)
  58         return false;
  59
  60     return rtl_ustr_reverseCompare_WithLength(mpData->buffer, mpData->length, r.mpData->buffer, r.mpData->length) == 0;
  61 }
  62
  63 }
  64
  65 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */