/usr/include/qgis/qgscachedfeatureiterator.h is in libqgis-dev 2.4.0-1+b1.
This file is owned by root:root, with mode 0o644.
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qgscachedfeatureiterator.h
--------------------------------------
Date : 12.2.2013
Copyright : (C) 2013 Matthias Kuhn
Email : matthias dot kuhn at gmx 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 "qgsfeature.h"
#include "qgsfeatureiterator.h"
class QgsVectorLayerCache;
/**
* @brief
* Delivers features from the cache
*
*/
class CORE_EXPORT QgsCachedFeatureIterator : public QgsAbstractFeatureIterator
{
public:
/**
* This constructor creates a feature iterator, that delivers only cached information, based on the
* @link QgsFeatureIds @endlink. No request is made to the backend.
*
* @param vlCache The vector layer cache to use
* @param featureRequest The feature request to answer
* @param featureIds The feature ids to return
*
* @deprecated Use QgsCachedFeatureIterator( QgsVectorLayerCache* vlCache, QgsFeatureRequest featureRequest )
* instead
*/
QgsCachedFeatureIterator( QgsVectorLayerCache* vlCache, QgsFeatureRequest featureRequest, QgsFeatureIds featureIds );
/**
* This constructor creates a feature iterator, that delivers all cached features. No request is made to the backend.
*
* @param vlCache The vector layer cache to use
* @param featureRequest The feature request to answer
*/
QgsCachedFeatureIterator( QgsVectorLayerCache* vlCache, QgsFeatureRequest featureRequest );
/**
* Rewind to the beginning of the iterator
*
* @return bool true if the operation was ok
*/
virtual bool rewind();
/**
* Close this iterator. No further features will be available.
*
* @return true if successful
*/
virtual bool close();
// QgsAbstractFeatureIterator interface
protected:
/**
* Implementation for fetching a feature.
*
* @param f Will write to this feature
* @return bool true if the operation was ok
*
* @see bool getFeature( QgsFeature& f )
*/
virtual bool fetchFeature( QgsFeature& f );
/**
* We have a local special iterator for FilterFids, no need to run the generic.
*
* @param f Will write to this feature
* @return bool true if the operation was ok
*/
virtual bool nextFeatureFilterFids( QgsFeature& f ) { return fetchFeature( f ); }
private:
QgsFeatureIds mFeatureIds;
QgsVectorLayerCache* mVectorLayerCache;
QgsFeatureIds::ConstIterator mFeatureIdIterator;
};
/**
* @brief
* Uses another iterator as backend and writes features to the cache
*
*/
class CORE_EXPORT QgsCachedFeatureWriterIterator : public QgsAbstractFeatureIterator
{
public:
/**
* This constructor creates a feature iterator, which queries the backend and caches retrieved features.
*
* @param vlCache The vector layer cache to use
* @param featureRequest The feature request to answer
*/
QgsCachedFeatureWriterIterator( QgsVectorLayerCache* vlCache, QgsFeatureRequest featureRequest );
/**
* Rewind to the beginning of the iterator
*
* @return bool true if the operation was ok
*/
virtual bool rewind();
/**
* Close this iterator. No further features will be available.
*
* @return true if successful
*/
virtual bool close();
protected:
/**
* Implementation for fetching a feature.
*
* @param f Will write to this feature
* @return bool true if the operation was ok
*
* @see bool getFeature( QgsFeature& f )
*/
virtual bool fetchFeature( QgsFeature& f );
private:
QgsFeatureIterator mFeatIt;
QgsVectorLayerCache* mVectorLayerCache;
QgsFeatureIds mFids;
};
#endif // QGSCACHEDFEATUREITERATOR_H
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