TODATableIterator.h

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/*
 * (C) Copyright 1996-2012 ECMWF.
 * 
 * This software is licensed under the terms of the Apache Licence Version 2.0
 * which can be obtained at http://www.apache.org/licenses/LICENSE-2.0. 
 * In applying this licence, ECMWF does not waive the privileges and immunities 
 * granted to it by virtue of its status as an intergovernmental organisation nor
 * does it submit to any jurisdiction.
 */
 
/// @author Piotr Kuchta
/// @author Simon Smart
/// ECMWF Oct 2010
 
#ifndef odc_sql_TODATableIterator_H
#define odc_sql_TODATableIterator_H
 
#include "eckit/sql/SQLTable.h"
 
#include "odc/Reader.h"
#include "odc/csv/TextReader.h"
 
 
namespace odc {
namespace sql {
 
template <typename READER> class TODATable;
 
//----------------------------------------------------------------------------------------------------------------------
 
template <typename READER>
class TODATableIterator : public eckit::sql::SQLTableIterator {
 
public: // methods
 
    TODATableIterator(const TODATable<READER>& parent,
                      const std::vector<std::reference_wrapper<const eckit::sql::SQLColumn>>& columns,
                      std::function<void(eckit::sql::SQLTableIterator&)> metadataUpdateCallback);
    virtual ~TODATableIterator();
 
private: // methods (override>
 
    virtual void rewind() override;
    virtual bool next() override;
 
    virtual std::vector<size_t> columnOffsets() const override;
    virtual std::vector<size_t> doublesDataSizes() const override;
    virtual const double* data() const override;
 
private: // methods
 
    void updateMetaData();
 
private: // members
 
    const TODATable<READER>& parent_;
    typename READER::iterator it_;
    typename READER::iterator end_;
 
    const std::vector<std::reference_wrapper<const eckit::sql::SQLColumn>>& columns_;
    std::vector<size_t> columnOffsets_;
    std::vector<size_t> columnDoublesSizes_;
 
    std::function<void(eckit::sql::SQLTableIterator&)> metadataUpdateCallback_;
 
    bool firstRow_;
};
 
extern template class TODATableIterator<Reader>;
extern template class TODATableIterator<TextReader>;
 
//----------------------------------------------------------------------------------------------------------------------
 
} // namespace sql
} // namespace odc
 
#endif