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/*! \internal \file
 * \brief
 * Declares gmx::AnalysisDataProxy.
 *
 * This header is only meant for internal use to implement
 * gmx::AbstractAnalysisData::setColumnModule().
 *
 * \author Teemu Murtola <teemu.murtola@gmail.com>
 * \ingroup module_analysisdata
 */
#ifndef GMX_ANALYSISDATA_DATAPROXY_H
#define GMX_ANALYSISDATA_DATAPROXY_H

#include "gromacs/analysisdata/abstractdata.h"
#include "gromacs/analysisdata/datamodule.h"

namespace gmx
{

/*! \internal
 * \brief
 * Internal implementation class used to implement column modules.
 *
 * This class serves as a proxy between AbstractAnalysisData and the attached
 * IAnalysisDataModule object.  For each notification that
 * AbstractAnalysisData sends, it maps it such that only the relevant columns
 * are visible to the IAnalysisDataModule.  Similarly, it implements
 * the frame access methods of AbstractAnalysisData such that only the relevant
 * columns are returned.
 *
 * \ingroup module_analysisdata
 */
class AnalysisDataProxy : public AbstractAnalysisData, public IAnalysisDataModule
{
public:
    /*! \brief
     * Creates a proxy object that only presents certain columns.
     *
     * \param[in] firstColumn  First column to present.
     * \param[in] columnSpan   Number of columns to present.
     * \param[in] data         Data object that should be wrapped.
     *
     * Does not throw.
     */
    AnalysisDataProxy(int firstColumn, int columnSpan, AbstractAnalysisData* data);

    int frameCount() const override;

    int flags() const override;

    void dataStarted(AbstractAnalysisData* data) override;
    bool parallelDataStarted(AbstractAnalysisData* data, const AnalysisDataParallelOptions& options) override;
    void frameStarted(const AnalysisDataFrameHeader& frame) override;
    void pointsAdded(const AnalysisDataPointSetRef& points) override;
    void frameFinished(const AnalysisDataFrameHeader& header) override;
    void frameFinishedSerial(int frameIndex) override;
    void dataFinished() override;

private:
    AnalysisDataFrameRef tryGetDataFrameInternal(int index) const override;
    bool                 requestStorageInternal(int nframes) override;

    AbstractAnalysisData& source_;
    int                   firstColumn_;
    int                   columnSpan_;
    bool                  bParallel_;

    // Copy and assign disallowed by base.
};

} // namespace gmx

#endif
