qgsdatumtransform.h

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/***************************************************************************
               qgsdatumtransform.h
               ------------------------
    begin                : Dec 2017
    copyright            : (C) 2017 Nyall Dawson
    email                : nyall dot dawson at gmail dot com
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/
#ifndef QGSDATUMTRANSFORM_H
#define QGSDATUMTRANSFORM_H

#include "qgis_core.h"
#include <QString>

class QgsCoordinateReferenceSystem;


class CORE_EXPORT QgsDatumTransform
{

  public:

    struct TransformPair
    {

      TransformPair( int sourceTransformId = -1, int destinationTransformId = -1 )
        : sourceTransformId( sourceTransformId )
        , destinationTransformId( destinationTransformId )
      {}

      int sourceTransformId = -1;

      int destinationTransformId = -1;

      bool operator==( QgsDatumTransform::TransformPair other ) const
      {
        return other.sourceTransformId == sourceTransformId && other.destinationTransformId == destinationTransformId;
      }

      bool operator!=( QgsDatumTransform::TransformPair other ) const
      {
        return other.sourceTransformId != sourceTransformId || other.destinationTransformId != destinationTransformId;
      }

    };

    struct TransformInfo
    {
      int datumTransformId = -1;

      int epsgCode = 0;

      QString sourceCrsAuthId;

      QString destinationCrsAuthId;

      QString sourceCrsDescription;

      QString destinationCrsDescription;

      QString remarks;

      QString scope;

      bool preferred = false;

      bool deprecated = false;

    };

    static QList< QgsDatumTransform::TransformPair > datumTransformations( const QgsCoordinateReferenceSystem &source, const QgsCoordinateReferenceSystem &destination );

    static QString datumTransformToProj( int datumTransformId );

    static int projStringToDatumTransformId( const QString &string );

    static QgsDatumTransform::TransformInfo datumTransformInfo( int datumTransformId );

  private:

    static void searchDatumTransform( const QString &sql, QList< int > &transforms );


};

#endif // QGSDATUMTRANSFORM_H