CrossNeighboursBinaryFileWriter.h

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//-----------------------------------------------------------------------------
// Initial version: 20/09/2005
// CVS: $Revision: 2989 $, $Date: 2006-10-12 17:31:45 +0100 (Thu, 12 Oct 2006) $, $Author: rsc $
//-----------------------------------------------------------------------------
#ifndef CROSSNEIGHBOURSBINARYFILEWRITER_DEFINED
#define CROSSNEIGHBOURSBINARYFILEWRITER_DEFINED

#include "Datum.h"
#include "FileObjectWriter.h"
#include "FileUtil.h"
#include "ObjectPairWriter.h"

class Object;
//-----------------------------------------------------------------------------

class CrossNeighboursBinaryFileWriter : public ObjectPairWriter
{
public:
  CrossNeighboursBinaryFileWriter(char const* aFileNameStr,
                                  bool aIsLarge = false,
                                  bool aIsSwapped = false);
  virtual ~CrossNeighboursBinaryFileWriter() {}

  virtual void open();

  virtual void close();

  virtual void write(Object const* aExternObjectPtr,
                     Object const* aMainObjectPtr)
  {
    Datum const*   mainDatumPtr = (Datum const*) aMainObjectPtr;
    Datum const* externDatumPtr = (Datum const*) aExternObjectPtr;
    if (!mIsSwapped)
    {
      mRecord.field.mainID = mainDatumPtr->getId();
      mRecord.field.externalID  =  externDatumPtr->getId();
    }
    else
    {
      mRecord.field.mainID = externDatumPtr->getId();
      mRecord.field.externalID  =  mainDatumPtr->getId();
    }
    mRecord.field.distanceMins = aMainObjectPtr->
                                   gcDistanceMins(*aExternObjectPtr);
    fwrite(mRecord.bytes, sizeof(char), mcRecordSize, mFilePtr);
  }

protected:
  static const unsigned mcRecordSize = 20;

  union {
    char bytes[mcRecordSize];
    struct {
      long long mainID;
      long long externalID;
      float distanceMins;
    } field;
  } mRecord;

  FILE*       mFilePtr;
  char const* mFileNameStr;
  bool        mIsLarge;
  bool        mIsSwapped;

private:
  // Prevent default construction and copying
  CrossNeighboursBinaryFileWriter();
  CrossNeighboursBinaryFileWriter(CrossNeighboursBinaryFileWriter const& aCopy);
  CrossNeighboursBinaryFileWriter& operator=
                                (CrossNeighboursBinaryFileWriter const& aCopy);
};
//-----------------------------------------------------------------------------
#endif