dbaccess/source/core/inc/composertools.hxx

   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  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20 #ifndef DBACCESS_SOURCE_CORE_INC_COMPOSERTOOLS_HXX
  21 #define DBACCESS_SOURCE_CORE_INC_COMPOSERTOOLS_HXX
  22
  23
  24 #include <rtl/ustrbuf.hxx>
  25
  26 #include <functional>
  27
  28 namespace dbaccess
  29 {
  30
  31     //====================================================================
  32     //= TokenComposer
  33     //====================================================================
  34     struct TokenComposer : public ::std::unary_function< ::rtl::OUString, void >
  35     {
  36     private:
  37         #ifdef DBG_UTIL
  38         bool                    m_bUsed;
  39         #endif
  40
  41     protected:
  42         ::rtl::OUStringBuffer   m_aBuffer;
  43
  44     public:
  45         ::rtl::OUString getComposedAndClear()
  46         {
  47             #ifdef DBG_UTIL
  48             m_bUsed = true;
  49             #endif
  50             return m_aBuffer.makeStringAndClear();
  51         }
  52
  53         void clear()
  54         {
  55             #ifdef DBG_UTIL
  56             m_bUsed = false;
  57             #endif
  58             m_aBuffer.makeStringAndClear();
  59         }
  60
  61     public:
  62         TokenComposer()
  63         #ifdef DBG_UTIL
  64             :m_bUsed( false )
  65         #endif
  66         {
  67         }
  68
  69         virtual ~TokenComposer()
  70         {
  71         }
  72
  73         void operator() (const ::rtl::OUString& lhs)
  74         {
  75             append(lhs);
  76         }
  77
  78         void append( const ::rtl::OUString& lhs )
  79         {
  80             #ifdef DBG_UTIL
  81             OSL_ENSURE( !m_bUsed, "FilterCreator::append: already used up!" );
  82             #endif
  83             if ( !lhs.isEmpty() )
  84             {
  85                 if ( m_aBuffer.getLength() )
  86                     appendNonEmptyToNonEmpty( lhs );
  87                 else
  88                     m_aBuffer.append( lhs );
  89             }
  90         }
  91
  92         /// append the given part. Only to be called when both the part and our buffer so far are not empty
  93         virtual void appendNonEmptyToNonEmpty( const ::rtl::OUString& lhs ) = 0;
  94     };
  95
  96     //====================================================================
  97     //= FilterCreator
  98     //====================================================================
  99     struct FilterCreator : public TokenComposer
 100     {
 101         virtual void appendNonEmptyToNonEmpty( const ::rtl::OUString& lhs )
 102         {
 103             m_aBuffer.insert( 0, (sal_Unicode)' ' );
 104             m_aBuffer.insert( 0, (sal_Unicode)'(' );
 105             m_aBuffer.appendAscii( " ) AND ( " );
 106             m_aBuffer.append( lhs );
 107             m_aBuffer.appendAscii( " )" );
 108         }
 109     };
 110
 111     //====================================================================
 112     //= FilterCreator
 113     //====================================================================
 114     struct OrderCreator : public TokenComposer
 115     {
 116         virtual void appendNonEmptyToNonEmpty( const ::rtl::OUString& lhs )
 117         {
 118             m_aBuffer.appendAscii( ", " );
 119             m_aBuffer.append( lhs );
 120         }
 121     };
 122
 123 } // namespace dbaccess
 124
 125 #endif // DBACCESS_SOURCE_CORE_INC_COMPOSERTOOLS_HXX
 126
 127 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */