IOManager.hh

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/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                         *
 *   $Date$                   *
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\*===========================================================================*/

//=============================================================================
//
//  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
//=============================================================================