src/IO/FileLineReader.hpp

   1 /*
   2 Copyright_License {
   3
   4   XCSoar Glide Computer - http://www.xcsoar.org/
   5   Copyright (C) 2000-2013 The XCSoar Project
   6   A detailed list of copyright holders can be found in the file "AUTHORS".
   7
   8   This program is free software; you can redistribute it and/or
   9   modify it under the terms of the GNU General Public License
  10   as published by the Free Software Foundation; either version 2
  11   of the License, or (at your option) any later version.
  12
  13   This program is distributed in the hope that it will be useful,
  14   but WITHOUT ANY WARRANTY; without even the implied warranty of
  15   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16   GNU General Public License for more details.
  17
  18   You should have received a copy of the GNU General Public License
  19   along with this program; if not, write to the Free Software
  20   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  21 }
  22 */
  23
  24 #ifndef XCSOAR_IO_FILE_LINE_READER_HPP
  25 #define XCSOAR_IO_FILE_LINE_READER_HPP
  26
  27 #include "FileSource.hpp"
  28 #include "LineSplitter.hpp"
  29 #include "ConvertLineReader.hpp"
  30
  31 /**
  32  * Glue class which combines FileSource and LineSplitter, and provides
  33  * a public NLineReader interface.
  34  */
  35 class FileLineReaderA : public NLineReader {
  36 protected:
  37   FileSource file;
  38   LineSplitter splitter;
  39
  40 public:
  41   FileLineReaderA(const char *path)
  42     :file(path), splitter(file) {}
  43 #ifdef _UNICODE
  44   FileLineReaderA(const TCHAR *path)
  45     :file(path), splitter(file) {}
  46 #endif
  47
  48   bool error() const {
  49     return file.error();
  50   }
  51
  52   /**
  53    * Rewind the file to the beginning.
  54    */
  55   bool Rewind() {
  56     if (!file.Rewind())
  57       return false;
  58
  59     splitter.ResetBuffer();
  60     return true;
  61   }
  62
  63 public:
  64   /* virtual methods from class NLineReader */
  65   virtual char *ReadLine() override;
  66   virtual long GetSize() const override;
  67   virtual long Tell() const override;
  68 };
  69
  70 /**
  71  * Glue class which combines FileSource, LineSplitter and
  72  * ConvertLineReader, and provides a public TLineReader interface.
  73  */
  74 class FileLineReader : public TLineReader {
  75 protected:
  76   FileSource file;
  77   LineSplitter splitter;
  78   ConvertLineReader convert;
  79
  80 public:
  81   FileLineReader(const char *path,
  82                  ConvertLineReader::charset cs=ConvertLineReader::UTF8)
  83     :file(path), splitter(file), convert(splitter, cs) {}
  84
  85 #ifdef _UNICODE
  86   FileLineReader(const TCHAR *path,
  87                  ConvertLineReader::charset cs=ConvertLineReader::UTF8)
  88     :file(path), splitter(file), convert(splitter, cs) {}
  89 #endif
  90
  91   bool error() const {
  92     return file.error();
  93   }
  94
  95   /**
  96    * Rewind the file to the beginning.
  97    */
  98   bool Rewind() {
  99     if (!file.Rewind())
 100       return false;
 101
 102     splitter.ResetBuffer();
 103     return true;
 104   }
 105
 106 public:
 107   /* virtual methods from class TLineReader */
 108   virtual TCHAR *ReadLine() override;
 109   virtual long GetSize() const override;
 110   virtual long Tell() const override;
 111 };
 112
 113 #endif