qgscoordinatereferencesystem.h

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/***************************************************************************
                             qgscoordinatereferencesystem.h

                             -------------------
    begin                : 2007
    copyright            : (C) 2007 by Gary E. Sherman
    email                : [email protected]
***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   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 QGSCOORDINATEREFERENCESYSTEM_H
#define QGSCOORDINATEREFERENCESYSTEM_H

//Standard includes
#include "qgis_core.h"
#include <ostream>

//qt includes
#include <QString>
#include <QMap>
#include <QHash>
#include <QReadWriteLock>
#include <QExplicitlySharedDataPointer>
#include <QObject>

//qgis includes
#include "qgis_sip.h"
#include "qgsunittypes.h"
#include "qgsrectangle.h"
#include "qgssqliteutils.h"

class QDomNode;
class QDomDocument;
class QgsCoordinateReferenceSystemPrivate;

// forward declaration for sqlite3
typedef struct sqlite3 sqlite3 SIP_SKIP;

#ifdef DEBUG
typedef struct OGRSpatialReferenceHS *OGRSpatialReferenceH SIP_SKIP;
#else
typedef void *OGRSpatialReferenceH SIP_SKIP;
#endif

class QgsCoordinateReferenceSystem;
typedef void ( *CUSTOM_CRS_VALIDATION )( QgsCoordinateReferenceSystem & ) SIP_SKIP;

class CORE_EXPORT QgsCoordinateReferenceSystem
{
    Q_GADGET

    Q_PROPERTY( QgsUnitTypes::DistanceUnit mapUnits READ mapUnits )
    Q_PROPERTY( bool isGeographic READ isGeographic )

  public:

    enum CrsType
    {
      InternalCrsId,  
      PostgisCrsId,   
      EpsgCrsId       
    };

    QgsCoordinateReferenceSystem();

    ~QgsCoordinateReferenceSystem();

    // TODO QGIS 4: remove "POSTGIS" and "INTERNAL", allow PROJ4 without the prefix

    explicit QgsCoordinateReferenceSystem( const QString &definition );

    // TODO QGIS 4: remove type and always use EPSG code

    explicit QgsCoordinateReferenceSystem( long id, CrsType type = PostgisCrsId );

    QgsCoordinateReferenceSystem( const QgsCoordinateReferenceSystem &srs );

    QgsCoordinateReferenceSystem &operator=( const QgsCoordinateReferenceSystem &srs );

    operator QVariant() const
    {
      return QVariant::fromValue( *this );
    }

    static QList< long > validSrsIds();

    // static creators

    static QgsCoordinateReferenceSystem fromOgcWmsCrs( const QString &ogcCrs );

    Q_INVOKABLE static QgsCoordinateReferenceSystem fromEpsgId( long epsg );

    static QgsCoordinateReferenceSystem fromProj4( const QString &proj4 );

    static QgsCoordinateReferenceSystem fromWkt( const QString &wkt );

    static QgsCoordinateReferenceSystem fromSrsId( long srsId );

    // Misc helper functions -----------------------

    // TODO QGIS 4: remove type and always use EPSG code, rename to createFromEpsg

    bool createFromId( long id, CrsType type = PostgisCrsId );

    // TODO QGIS 4: remove "QGIS" and "CUSTOM", only support "USER" (also returned by authid())

    bool createFromOgcWmsCrs( const QString &crs );

    // TODO QGIS 4: remove unless really necessary - let's use EPSG codes instead

    bool createFromSrid( long srid );

    bool createFromWkt( const QString &wkt );

    bool createFromSrsId( long srsId );

    bool createFromProj4( const QString &projString );

    bool createFromString( const QString &definition );
    // TODO QGIS3: rename to createFromStringOGR so it is clear it's similar to createFromString, just different backend
    bool createFromUserInput( const QString &definition );

    static void setupESRIWktFix();

    bool isValid() const;

    void validate();

    // TODO QGIS 4: seems completely obsolete now (only compares proj4 - already done in createFromProj4)

    long findMatchingProj();

    bool operator==( const QgsCoordinateReferenceSystem &srs ) const;

    bool operator!=( const QgsCoordinateReferenceSystem &srs ) const;

    bool readXml( const QDomNode &node );

    bool writeXml( QDomNode &node, QDomDocument &doc ) const;


    static void setCustomCrsValidation( CUSTOM_CRS_VALIDATION f ) SIP_SKIP;

    static CUSTOM_CRS_VALIDATION customCrsValidation() SIP_SKIP;

    // Accessors -----------------------------------

    long srsid() const;

    // TODO QGIS 4: remove unless really necessary - let's use EPSG codes instead

    long postgisSrid() const;

    QString authid() const;

    QString description() const;

    QString projectionAcronym() const;

    QString ellipsoidAcronym() const;

    QString toWkt() const;

    QString toProj4() const;

    bool isGeographic() const;

    bool hasAxisInverted() const;

    QgsUnitTypes::DistanceUnit mapUnits() const;

    QgsRectangle bounds() const;

    // Mutators -----------------------------------

    void setValidationHint( const QString &html );

    QString validationHint();

    static int syncDatabase();


    long saveAsUserCrs( const QString &name );

    QString geographicCrsAuthId() const;

    static QStringList recentProjections();

    static void invalidateCache();

    // Mutators -----------------------------------
    // We don't want to expose these to the public api since they won't create
    // a fully valid crs. Programmers should use the createFrom* methods rather
  private:

    static QString proj4FromSrsId( int srsId );

    void setInternalId( long srsId );

    void setSrid( long srid );

    void setDescription( const QString &description );

    void setProj4String( const QString &proj4String );

    void setGeographicFlag( bool geoFlag );

    void setEpsg( long epsg );

    void setAuthId( const QString &theID );

    void setProjectionAcronym( const QString &projectionAcronym );

    void setEllipsoidAcronym( const QString &ellipsoidAcronym );

    void debugPrint();

    typedef QMap<QString, QString> RecordMap;

    RecordMap getRecord( const QString &sql );

    static int openDatabase( const QString &path, sqlite3_database_unique_ptr &database, bool readonly = true );

    void setMapUnits();

    long getRecordCount();

    bool loadFromDatabase( const QString &db, const QString &expression, const QString &value );

    static bool loadIds( QHash<int, QString> &wkts );
    static bool loadWkts( QHash<int, QString> &wkts, const char *filename );
    static bool syncDatumTransform( const QString &dbPath );

    QExplicitlySharedDataPointer<QgsCoordinateReferenceSystemPrivate> d;

    static CUSTOM_CRS_VALIDATION mCustomSrsValidation;


    // cache

    static QReadWriteLock sSrIdCacheLock;
    static QHash< long, QgsCoordinateReferenceSystem > sSrIdCache;
    static QReadWriteLock sOgcLock;
    static QHash< QString, QgsCoordinateReferenceSystem > sOgcCache;
    static QReadWriteLock sProj4CacheLock;
    static QHash< QString, QgsCoordinateReferenceSystem > sProj4Cache;
    static QReadWriteLock sCRSWktLock;
    static QHash< QString, QgsCoordinateReferenceSystem > sWktCache;
    static QReadWriteLock sCRSSrsIdLock;
    static QHash< long, QgsCoordinateReferenceSystem > sSrsIdCache;
    static QReadWriteLock sCrsStringLock;
    static QHash< QString, QgsCoordinateReferenceSystem > sStringCache;

    friend class TestQgsCoordinateReferenceSystem;
};

Q_DECLARE_METATYPE( QgsCoordinateReferenceSystem )

#ifndef SIP_RUN
inline std::ostream &operator << ( std::ostream &os, const QgsCoordinateReferenceSystem &r )
{
  QString mySummary( QStringLiteral( "\n\tSpatial Reference System:" ) );
  mySummary += QLatin1String( "\n\t\tDescription : " );
  if ( !r.description().isNull() )
  {
    mySummary += r.description();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }
  mySummary += QLatin1String( "\n\t\tProjection  : " );
  if ( !r.projectionAcronym().isNull() )
  {
    mySummary += r.projectionAcronym();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }

  mySummary += QLatin1String( "\n\t\tEllipsoid   : " );
  if ( !r.ellipsoidAcronym().isNull() )
  {
    mySummary += r.ellipsoidAcronym();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }

  mySummary += QLatin1String( "\n\t\tProj4String  : " );
  if ( !r.toProj4().isNull() )
  {
    mySummary += r.toProj4();
  }
  else
  {
    mySummary += QLatin1String( "Undefined" );
  }
  // Using streams we need to use local 8 Bit
  return os << mySummary.toLocal8Bit().data() << std::endl;
}
#endif

#endif // QGSCOORDINATEREFERENCESYSTEM_H