qgscoordinatetransformcontext.h

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/***************************************************************************
                         qgscoordinatetransformcontext.h
                         -------------------------------
    begin                : November 2017
    copyright            : (C) 2017 by 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 QGSCOORDINATETRANSFORMCONTEXT_H
#define QGSCOORDINATETRANSFORMCONTEXT_H

#include "qgis_core.h"
#include "qgis.h"
#include "qgsdatumtransform.h"

class QgsCoordinateReferenceSystem;
class QgsReadWriteContext;
class QgsCoordinateTransformContextPrivate;
class QDomElement;

/***************************************************************************
 * This class is considered CRITICAL and any change MUST be accompanied with
 * full unit tests in testqgsfeature.cpp.
 * See details in QEP #17
 ****************************************************************************/

class CORE_EXPORT QgsCoordinateTransformContext
{
  public:

    QgsCoordinateTransformContext();

    ~QgsCoordinateTransformContext();

    QgsCoordinateTransformContext( const QgsCoordinateTransformContext &rhs );

    QgsCoordinateTransformContext &operator=( const QgsCoordinateTransformContext &rhs ) SIP_SKIP;


    void clear();


#if 0
//singlesourcedest

    QMap<QString, int> sourceDatumTransforms() const;

    bool addSourceDatumTransform( const QgsCoordinateReferenceSystem &crs, int transform );

    void removeSourceDatumTransform( const QgsCoordinateReferenceSystem &crs );

    QMap< QString, int > destinationDatumTransforms() const;

    bool addDestinationDatumTransform( const QgsCoordinateReferenceSystem &crs, int transform );

    void removeDestinationDatumTransform( const QgsCoordinateReferenceSystem &crs );

#endif

    QMap< QPair< QString, QString>, QgsDatumTransform::TransformPair > sourceDestinationDatumTransforms() const;

    bool addSourceDestinationDatumTransform( const QgsCoordinateReferenceSystem &sourceCrs,
        const QgsCoordinateReferenceSystem &destinationCrs,
        int sourceTransformId,
        int destinationTransformId );

    void removeSourceDestinationDatumTransform( const QgsCoordinateReferenceSystem &sourceCrs,
        const QgsCoordinateReferenceSystem &destinationCrs );

    bool hasTransform( const QgsCoordinateReferenceSystem &source,
                       const QgsCoordinateReferenceSystem &destination ) const;

    QgsDatumTransform::TransformPair calculateDatumTransforms( const QgsCoordinateReferenceSystem &source,
        const QgsCoordinateReferenceSystem &destination ) const;

    bool readXml( const QDomElement &element, const QgsReadWriteContext &context, QStringList &missingTransforms SIP_OUT );

    void writeXml( QDomElement &element, const QgsReadWriteContext &context ) const;


    void readSettings();

    void writeSettings();


  private:

    QExplicitlySharedDataPointer<QgsCoordinateTransformContextPrivate> d;

};

#endif // QGSCOORDINATETRANSFORMCONTEXT_H