CDMReader.h

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/*
 * Fimex
 *
 * (C) Copyright 2008, met.no
 *
 * Project Info:  https://wiki.met.no/fimex/start
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or
 * (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
 * USA.
 */

#ifndef CDMREADER_H_
#define CDMREADER_H_

#include <boost/shared_ptr.hpp>
#include <boost/noncopyable.hpp>
#include "fimex/DataDecl.h"
#include "fimex/CDMException.h"
#include "fimex/SliceBuilder.h"

namespace MetNoFimex
{
/* forward declarations */
class CDM;
class CDMVariable;
class UnitsConverter;

class CDMReader : boost::noncopyable
{
public:
    CDMReader();
    virtual ~CDMReader() {}

    virtual const CDM& getCDM() const;
    virtual CDM& getInternalCDM();

    virtual std::vector<std::size_t> getDims(std::string varName);
    virtual std::vector<std::size_t> getDimsSlice(std::string varName);
    virtual DataPtr getDataSlice(const std::string& varName, size_t unLimDimPos) = 0;

    virtual DataPtr getDataSlice(const std::string& varName, const SliceBuilder& sb);

    virtual DataPtr getData(const std::string& varName);

    virtual DataPtr getScaledDataSlice(const std::string& varName, size_t unLimDimPos);
    virtual DataPtr getScaledDataSliceInUnit(const std::string& varName, const std::string& unit, size_t unLimDimPos);

    virtual DataPtr getScaledDataSlice(const std::string& varName, const SliceBuilder& sb);
    virtual DataPtr getScaledDataSliceInUnit(const std::string& varName, const std::string& unit, const SliceBuilder& sb);

    virtual DataPtr getScaledData(const std::string& varName);
    virtual DataPtr getScaledDataInUnit(const std::string& varName, const std::string& unit);

protected:
    boost::shared_ptr<CDM> cdm_;
    virtual DataPtr getDataSliceFromMemory(const CDMVariable& variable, size_t unLimDimPos = 0);

    void getScaleAndOffsetOf(const std::string& varName, double& scale, double& offset) const;

private:
    DataPtr scaleDataOf(const std::string& varName, DataPtr data, double unitScale = 1., double unitOffset = 0.);
    DataPtr scaleDataOf(const std::string& varName, DataPtr data, boost::shared_ptr<UnitsConverter> uc);
    DataPtr scaleDataToUnitOf(const std::string& varName, DataPtr data, const std::string& unit);
};

}

#endif /*CDMREADER_H_*/