qgscachedfeatureiterator.h

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/***************************************************************************
    qgscachedfeatureiterator.h
     --------------------------------------
    Date                 : 12.2.2013
    Copyright            : (C) 2013 Matthias Kuhn
    Email                : matthias at opengis dot ch
 ***************************************************************************
 *                                                                         *
 *   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 QGSCACHEDFEATUREITERATOR_H
#define QGSCACHEDFEATUREITERATOR_H
 
#include "qgis_core.h"
#include "qgscoordinatetransform.h"
#include "qgsfeature.h"
#include "qgsfeatureiterator.h"
#include "qgsvectorlayercache.h"
 
#include <QPointer>
 
class QgsVectorLayerCache;

class CORE_EXPORT QgsCachedFeatureIterator : public QgsAbstractFeatureIterator
{
  public:
    QgsCachedFeatureIterator( QgsVectorLayerCache *vlCache, const QgsFeatureRequest &featureRequest );
 
    ~QgsCachedFeatureIterator() override;

    bool rewind() override;

    bool close() override;
 
    // QgsAbstractFeatureIterator interface
  protected:
    bool fetchFeature( QgsFeature &f ) override;

    bool nextFeatureFilterFids( QgsFeature &f ) override { return fetchFeature( f ); }
 
  private:
#ifdef SIP_RUN
    QgsCachedFeatureIterator( const QgsCachedFeatureIterator &other );
#endif
 
    QList< QgsFeatureId > mFeatureIds;
    QPointer< QgsVectorLayerCache > mVectorLayerCache = nullptr;
    QList< QgsFeatureId >::ConstIterator mFeatureIdIterator;
    QgsCoordinateTransform mTransform;
    QgsRectangle mFilterRect;
 
    QgsGeometry mDistanceWithinGeom;
    std::unique_ptr< QgsGeometryEngine > mDistanceWithinEngine;
    double mDistanceWithin = 0;
};

class CORE_EXPORT QgsCachedFeatureWriterIterator : public QgsAbstractFeatureIterator
{
  public:
    QgsCachedFeatureWriterIterator( QgsVectorLayerCache *vlCache, const QgsFeatureRequest &featureRequest );

    bool rewind() override;

    bool close() override;
 
  protected:
    bool fetchFeature( QgsFeature &f ) override;
 
  private:
    QgsFeatureIterator mFeatIt;
    QPointer< QgsVectorLayerCache > mVectorLayerCache;
    QgsFeatureIds mFids;
    QgsCoordinateTransform mTransform;
    QgsRectangle mFilterRect;
};
#endif // QGSCACHEDFEATUREITERATOR_H