QGIS API Documentation  3.21.0-Master (5b68dc587e)
qgscacheindex.h
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1 /***************************************************************************
2  qgscacheindex.h
3  --------------------------------------
4  Date : 13.2.2013
5  Copyright : (C) 2013 Matthias Kuhn
6  Email : matthias at opengis dot ch
7  ***************************************************************************
8  * *
9  * This program is free software; you can redistribute it and/or modify *
10  * it under the terms of the GNU General Public License as published by *
11  * the Free Software Foundation; either version 2 of the License, or *
12  * (at your option) any later version. *
13  * *
14  ***************************************************************************/
15 
16 #ifndef QGSCACHEINDEX_H
17 #define QGSCACHEINDEX_H
18 
19 #include "qgis_core.h"
20 #include "qgsfeatureid.h"
21 
22 class QgsFeatureRequest;
23 class QgsFeatureIterator;
24 
31 class CORE_EXPORT QgsAbstractCacheIndex
32 {
33  public:
34 
38  QgsAbstractCacheIndex() = default;
39  virtual ~QgsAbstractCacheIndex() = default;
40 
45  virtual void flushFeature( QgsFeatureId fid ) = 0;
46 
51  virtual void flush() = 0;
52 
62  virtual void requestCompleted( const QgsFeatureRequest &featureRequest, const QgsFeatureIds &fids );
63 
79  virtual bool getCacheIterator( QgsFeatureIterator &featureIterator, const QgsFeatureRequest &featureRequest ) = 0;
80 };
81 
82 #endif // QGSCACHEINDEX_H
Abstract base class for cache indices.
Definition: qgscacheindex.h:32
virtual bool getCacheIterator(QgsFeatureIterator &featureIterator, const QgsFeatureRequest &featureRequest)=0
Is called when a feature request is issued on a cached layer.
QgsAbstractCacheIndex()=default
Constructor for QgsAbstractCacheIndex.
virtual ~QgsAbstractCacheIndex()=default
virtual void flush()=0
Sometimes, the whole cache changes its state and its easier to just withdraw everything.
virtual void flushFeature(QgsFeatureId fid)=0
Is called whenever a feature is removed from the cache.
Wrapper for iterator of features from vector data provider or vector layer.
This class wraps a request for features to a vector layer (or directly its vector data provider).
QSet< QgsFeatureId > QgsFeatureIds
Definition: qgsfeatureid.h:37
qint64 QgsFeatureId
64 bit feature ids negative numbers are used for uncommitted/newly added features
Definition: qgsfeatureid.h:28