defaultItemW.h

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/*
 *  Default item writer class
 */
#ifndef AIMS_IO_DEFAULTITEMW_H
#define AIMS_IO_DEFAULTITEMW_H


#include <aims/config/aimsdata_config.h>
#include <aims/def/general.h>
#include <aims/vector/vector.h>
#include <aims/rgb/rgb.h>
#include <aims/io/itemW.h>


namespace aims
{

  template <class T>
  class AIMSDATA_API DefaultItemWriter : public ItemWriter<T>
  {
  public:
    DefaultItemWriter() : ItemWriter<T>() { }
    virtual ~DefaultItemWriter() { }

    virtual void write( std::ostream & os, const T & item ) const 
    { write( os, &item, 1 ); }
    virtual void write( std::ostream & os, const T* pitem, size_t n ) const;
    virtual ItemWriter<T>* writer( const std::string & openmode = "binar", 
                                   bool bswap = false ) const;
  };


  template <class T>
  class AIMSDATA_API DefaultAsciiItemWriter : public DefaultItemWriter<T>
  {
  public:
    DefaultAsciiItemWriter() : DefaultItemWriter<T>() { }
    virtual ~DefaultAsciiItemWriter() { }

    virtual void write( std::ostream & os, const T& item ) const;
    virtual void write( std::ostream & os, const T* pitem, size_t n ) const;
  };


  template <class T>
  class AIMSDATA_API DefaultBSwapItemWriter : public DefaultItemWriter<T>
  {
  public:
    DefaultBSwapItemWriter() : DefaultItemWriter<T>() { }
    virtual ~DefaultBSwapItemWriter() { }

    virtual void write( std::ostream & os, const T& item ) const 
    { write( os, &item, 1 ); }
    virtual void write( std::ostream & os, const T* pitem, size_t n ) const;
  };


#ifndef DOXYGEN_HIDE_INTERNAL_CLASSES

  template <class T, int D>
  class AIMSDATA_API DefaultItemWriter<AimsVector<T,D> > 
    : public ItemWriter<AimsVector<T,D> >
  {
  public:
    DefaultItemWriter() : ItemWriter<AimsVector<T,D> >() { }
    virtual ~DefaultItemWriter() { }

    virtual void write( std::ostream & os, 
                        const AimsVector<T,D> & item ) const 
    { write( os, &item, 1 ); }
    virtual void write( std::ostream & os, const AimsVector<T,D> * pitem, 
                        size_t n ) const;
    virtual ItemWriter<AimsVector<T,D> >* writer( const std::string & openmode 
                                                  = "binar", 
                                                  bool bswap = false ) const;
  };


  template <class T, int D>
  class AIMSDATA_API DefaultBSwapItemWriter<AimsVector<T,D> > 
    : public DefaultItemWriter<AimsVector<T,D> >
  {
  public:
    DefaultBSwapItemWriter() : DefaultItemWriter<AimsVector<T,D> >() { }
    virtual ~DefaultBSwapItemWriter() { }

    virtual void write( std::ostream & os, 
                        const AimsVector<T,D> & item ) const 
    { write( os, &item, 1 ); }
    virtual void write( std::ostream & os, const AimsVector<T,D> * pitem, 
                        size_t n ) const;
  };

#endif


  template<class T> ItemWriter<T>* 
  DefaultItemWriter<T>::writer( const std::string & openmode, 
                                bool bswap ) const
  {
    if( openmode == "ascii" )
      return( new DefaultAsciiItemWriter<T> );
    if( bswap )
      return( new DefaultBSwapItemWriter<T> );
    return( new DefaultItemWriter<T> );
  }


  template <class T> inline void
  DefaultItemWriter<T>::write( std::ostream & os, const T* pitem, 
                               size_t n ) const
  {
    os.write( (const char *) pitem, sizeof(T) * n );
  }


  template <class T> inline
  void DefaultAsciiItemWriter<T>::write( std::ostream & os, 
                                         const T& item ) const
  {
    os << item << " ";
  }


  template <class T> inline
  void DefaultAsciiItemWriter<T>::write( std::ostream & os, const T* pitem, 
                                         size_t n ) const
  {
    const T* ptr = pitem;
    for( size_t i=0; i<n; ++i, ++ptr )
      os << *ptr << " ";
  }


  template <class T> inline
  void DefaultBSwapItemWriter<T>::write( std::ostream & os, const T* pitem, 
                                         size_t n ) const
  {
    byte        *pd = new byte[ n * sizeof( T ) ];
    const byte  *ps = (byte *) pitem;
    for( size_t k=0; k<n*sizeof(T); k+=sizeof(T) )
      for( size_t b=0; b<sizeof(T)/2; ++b )
        pd[k+b] = ps[k+sizeof(T)-1-b];
    os.write( (const char *) pd, sizeof(T) * n );
    delete[] pd;
  }


  //    partial specializations

  template<class T, int D> ItemWriter<AimsVector<T, D> >* 
  DefaultItemWriter<AimsVector<T, D> >::writer( const std::string & openmode, 
                                                bool bswap ) const
  {
    if( openmode == "ascii" )
      return( new DefaultAsciiItemWriter<AimsVector<T, D> > );
    if( bswap )
      return( new DefaultBSwapItemWriter<AimsVector<T, D> > );
    return( new DefaultItemWriter<AimsVector<T, D> > );
  }


  template <class T, int D> inline void
  DefaultItemWriter<AimsVector<T, D> >::write( std::ostream & os, 
                                               const AimsVector<T, D>* pitem, 
                                               size_t n ) const
  {
    DefaultItemWriter<T>        ir;
    const AimsVector<T,D>       *ptr = pitem;

    for( size_t p=0; p<n; ++p, ++ptr )
      ir.write( os, &(*ptr)[0], D );
  }


  template <class T, int D> inline void
  DefaultBSwapItemWriter<AimsVector<T, D> >::write( std::ostream & os, 
                                                    const AimsVector<T, D>
                                                    * pitem, 
                                                    size_t n ) const
  {
    DefaultBSwapItemWriter<T>   ir;
    const AimsVector<T,D>       *ptr = pitem;

    for( size_t p=0; p<n; ++p, ++ptr )
      ir.write( os, &(*ptr)[0], D );
  }


  //    specializations

  template <> inline void 
  DefaultItemWriter<Void>::write( std::ostream &, const Void*, size_t ) const
  {
  }


  template <> inline void
  DefaultAsciiItemWriter<Void>::write( std::ostream & , const Void*, 
                                       size_t ) const
  {
  }


  template <> inline void
  DefaultBSwapItemWriter<Void>::write( std::ostream &, const Void*, 
                                       size_t ) const
  {
  }


  template <> inline void 
  DefaultBSwapItemWriter<int8_t>::write( std::ostream & os, 
                                         const int8_t* pitem, size_t n ) const
  {
    os.write( (const char *) pitem, n );
  }


  template <> inline void
  DefaultBSwapItemWriter<uint8_t>::write( std::ostream & os, 
                                          const uint8_t* pitem, 
                                          size_t n ) const
  {
    os.write( (const char *) pitem, n );
  }


  template <> inline void 
  DefaultBSwapItemWriter<bool>::write( std::ostream & os, const bool* pitem, 
                                       size_t n ) const
  {
    os.write( (const char *) pitem, n );
  }


  template <> inline void
  DefaultBSwapItemWriter<cfloat>::write( std::ostream & os, 
                                         const cfloat* pitem, size_t n ) const
  {
    byte        *pd = new byte[ n * sizeof( cfloat ) ];
    const byte  *ps = (byte*) pitem;
    for( size_t k=0; k<n*sizeof(cfloat); k+=sizeof(float) )
      for( size_t b=0; b<sizeof(float)/2; ++b )
        pd[k+b] = ps[k+sizeof(float)-1-b];
    os.write( (const char *) pd, n );
    delete[] pd;
  }


  template <> inline void
  DefaultBSwapItemWriter<cdouble>::write( std::ostream & os, 
                                          const cdouble* pitem, 
                                          size_t n ) const
  {
    byte        *pd = new byte[ n * sizeof( cdouble ) ];
    const byte  *ps = (byte*) pitem;
    for( size_t k=0; k<n*sizeof(cdouble); k+=sizeof(float) )
      for( size_t b=0; b<sizeof(double)/2; ++b )
        pd[k+b] = ps[k+sizeof(double)-1-b];
    os.write( (const char *) pd, n );
    delete[] pd;
  }


  // ### remove after everything has been moved to intN_t/uintN_t
#if !defined(__sun__) || !defined(_CHAR_IS_SIGNED)
  template <> inline void
  DefaultBSwapItemWriter<char>::write( std::ostream & os, 
                                       const char* pitem, 
                                       size_t n ) const
  {
    os.write( (const char *) pitem, n );
  }
#endif


}


#endif