IOManager.hh

/* ========================================================================= *
 *                                                                           *
 *                               OpenMesh                                    *
 *           Copyright (c) 2001-2023, RWTH-Aachen University                 *
 *           Department of Computer Graphics and Multimedia                  *
 *                          All rights reserved.                             *
 *                            www.openmesh.org                               *
 *                                                                           *
 *---------------------------------------------------------------------------*
 * This file is part of OpenMesh.                                            *
 *---------------------------------------------------------------------------*
 *                                                                           *
 * Redistribution and use in source and binary forms, with or without        *
 * modification, are permitted provided that the following conditions        *
 * are met:                                                                  *
 *                                                                           *
 * 1. Redistributions of source code must retain the above copyright notice, *
 *    this list of conditions and the following disclaimer.                  *
 *                                                                           *
 * 2. Redistributions in binary form must reproduce the above copyright      *
 *    notice, this list of conditions and the following disclaimer in the    *
 *    documentation and/or other materials provided with the distribution.   *
 *                                                                           *
 * 3. Neither the name of the copyright holder nor the names of its          *
 *    contributors may be used to endorse or promote products derived from   *
 *    this software without specific prior written permission.               *
 *                                                                           *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS       *
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED *
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A           *
 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER *
 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,  *
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,       *
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR        *
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF    *
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING      *
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS        *
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.              *
 *                                                                           *
 * ========================================================================= */
 
 
 
//=============================================================================
//
//  Implements the OpenMesh IOManager singleton
//
//=============================================================================
 
#ifndef __IOMANAGER_HH__
#define __IOMANAGER_HH__
 
 
//=== INCLUDES ================================================================
 
 
// STL
#include <iosfwd>
#include <sstream>
#include <string>
#include <set>
 
// OpenMesh
#include <OpenMesh/Core/System/config.h>
#include <OpenMesh/Core/IO/Options.hh>
#include <OpenMesh/Core/IO/reader/BaseReader.hh>
#include <OpenMesh/Core/IO/writer/BaseWriter.hh>
#include <OpenMesh/Core/IO/importer/BaseImporter.hh>
#include <OpenMesh/Core/IO/exporter/BaseExporter.hh>
#include <OpenMesh/Core/Utils/SingletonT.hh>
 
 
//== NAMESPACES ===============================================================
 
 
namespace OpenMesh {
namespace IO {
 
 
//=== IMPLEMENTATION ==========================================================
 
 
class OPENMESHDLLEXPORT _IOManager_
{
private:
 
  _IOManager_() {}
 
  ~_IOManager_() {};
 
  friend OPENMESHDLLEXPORT _IOManager_& IOManager();
 
public:
 
  bool read(const std::string& _filename,
            BaseImporter& _bi,
            Options& _opt);
 
  bool read(std::istream& _filename,
            const std::string& _ext,
            BaseImporter& _bi,
            Options& _opt);
 
 
  bool write(const std::string& _filename,
             BaseExporter& _be,
             Options _opt=Options::Default,
       std::streamsize _precision = 6);
 
  bool write(std::ostream& _filename,
             const std::string& _ext,
             BaseExporter& _be,
             Options _opt=Options::Default,
       std::streamsize _precision = 6);
 
 
  bool can_read( const std::string& _format ) const;
 
  bool can_write( const std::string& _format ) const;
 
 
  size_t binary_size(const std::string& _format,
                     BaseExporter& _be,
                     Options _opt = Options::Default)
  {
    const BaseWriter *bw = find_writer(_format);
    return bw ? bw->binary_size(_be,_opt) : 0;
  }
 
 
 
public: //-- QT convenience function ------------------------------------------
 
 
  const std::string& qt_read_filters()  const { return read_filters_;  }
 
 
  const std::string& qt_write_filters() const { return write_filters_; }
 
 
 
private:
 
  // collect all readable file extensions
  void update_read_filters();
 
 
  // collect all writeable file extensions
  void update_write_filters();
 
 
 
public:  //-- SYSTEM PART------------------------------------------------------
 
 
  bool register_module(BaseReader* _bl)
  {
    reader_modules_.insert(_bl);
    update_read_filters();
    return true;
  }
 
 
 
  bool register_module(BaseWriter* _bw)
  {
    writer_modules_.insert(_bw);
    update_write_filters();
    return true;
  }
 
 
private:
 
  const BaseWriter *find_writer(const std::string& _format);
 
  // stores registered reader modules
  std::set<BaseReader*> reader_modules_;
 
  // stores registered writer modules
  std::set<BaseWriter*> writer_modules_;
 
  // input filters (e.g. for Qt file dialog)
  std::string read_filters_;
 
  // output filters (e.g. for Qt file dialog)
  std::string write_filters_;
};
 
 
//=============================================================================
 
 
//_IOManager_*  __IOManager_instance; Causes memory leak, as destructor is never called
 
OPENMESHDLLEXPORT _IOManager_& IOManager();
 
//=============================================================================
} // namespace IO
} // namespace OpenMesh
//=============================================================================
#endif
//=============================================================================