// SimpleDatasetMerger.h

#ifndef dset__SimpleDatasetMerger_H
#define dset__SimpleDatasetMerger_H

// David Adams
// April 2004
//
// This dataset merger inserts the datasets into a simple
// compound dataset.
//
// All compound datasets returned as results are stored in
// the current default dataset repository.

#include "dataset_util/Text.h"
#include "dataset_split/DatasetMerger.h"

namespace dset {

class SimpleCompoundDataset;

class SimpleDatasetMerger : public DatasetMerger {

private:  //data

  SimpleCompoundDataset* m_pdst;
  SimpleCompoundDataset* m_pdst_last;
  bool m_open;

public:  // constructors and destructor.

  // Constructor.
  SimpleDatasetMerger();

  // Destructor.
  ~SimpleDatasetMerger();

public:  // inherited functions

  // Validity.
  bool is_valid() const;

  // Closed.
  bool is_open() const;

  // Append a dataset.
  int append(const Dataset& dst);

  // Return the result.
  // This should not be blocking--if the result will require a long
  // time to calculate, then this method should quickly return a
  // (consistent) partial result.
  DatasetMergeResult result();

  // Close.
  int close();

  // Output stream.
  std::ostream& ostr(std::ostream& str) const;

};

}  // end namespace dset

#endif