qgswmsrendercontext.h

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/***************************************************************************
                              qgswmsrendercontext.h
                              ---------------------
  begin                : March 22, 2019
  copyright            : (C) 2019 by Paul Blottiere
  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 QGSWMSRENDERCONTEXT_H
#define QGSWMSRENDERCONTEXT_H

#include "qgswmsparameters.h"
#include "qgsproject.h"
#include "qgsserverinterface.h"

namespace QgsWms
{

  class QgsWmsRenderContext
  {
    public:
      enum Flag
      {
        UseScaleDenominator    = 0x01,
        UseOpacity             = 0x02,
        UseFilter              = 0x04,
        UseSelection           = 0x08,
        AddHighlightLayers     = 0x10,
        UpdateExtent           = 0x20,
        SetAccessControl       = 0x40,
        AddQueryLayers         = 0x80,
        UseWfsLayersOnly       = 0x100,
        AddExternalLayers      = 0x200,
        UseSrcWidthHeight      = 0x400
      };
      Q_DECLARE_FLAGS( Flags, Flag )

      
      QgsWmsRenderContext() = default;

      QgsWmsRenderContext( const QgsProject *project, QgsServerInterface *interface );

      void setParameters( const QgsWmsParameters &parameters );

      QgsWmsParameters parameters() const;

      const QgsServerSettings &settings() const;

      const QgsProject *project() const;

      void setFlag( Flag flag, bool on = true );

      bool testFlag( Flag flag ) const;

      QList<QgsMapLayer *> layers() const;

      QList<QgsMapLayer *> layersToRender() const;

      QDomElement sld( const QgsMapLayer &layer ) const;

      QString style( const QgsMapLayer &layer ) const;

      double scaleDenominator() const;

      void setScaleDenominator( double scaleDenominator );

      bool updateExtent() const;

      QgsWmsParametersLayer parameters( const QgsMapLayer &layer ) const;

      int imageQuality() const;

      int precision() const;

      QString layerNickname( const QgsMapLayer &layer ) const;

      QgsMapLayer *layer( const QString &nickname ) const;

      bool isValidLayer( const QString &nickname ) const;

      bool isValidGroup( const QString &name ) const;

      qreal dotsPerMm() const;

      QStringList flattenedQueryLayers() const;

#ifdef HAVE_SERVER_PYTHON_PLUGINS

      QgsAccessControl *accessControl() const;
#endif

      QMap<QString, QList<QgsMapLayer *> > layerGroups() const;

      QSize mapSize( bool aspectRatio = true ) const;

      bool isValidWidthHeight() const;

      int mapWidth() const;

      int mapHeight() const;

    private:
      void initNicknameLayers();
      void initRestrictedLayers();
      void initLayerGroupsRecursive( const QgsLayerTreeGroup *group, const QString &groupName );

      void searchLayersToRender();
      void searchLayersToRenderSld();
      void searchLayersToRenderStyle();
      void removeUnwantedLayers();

      void checkLayerReadPermissions();

      bool layerScaleVisibility( const QString &name ) const;

      const QgsProject *mProject = nullptr;
      QgsServerInterface *mInterface = nullptr;
      QgsWmsParameters mParameters;
      Flags mFlags = nullptr;
      double mScaleDenominator = -1.0;

      // nickname of all layers defined within the project
      QMap<QString, QgsMapLayer *> mNicknameLayers;

      // map of layers to use for rendering
      QList<QgsMapLayer *> mLayersToRender;

      // list of layers which are not usable
      QStringList mRestrictedLayers;

      QMap<QString, QList<QgsMapLayer *> > mLayerGroups;

      QMap<QString, QDomElement> mSlds;
      QMap<QString, QString> mStyles;
  };
};

#endif