QGIS API Documentation  3.21.0-Master (909859188c)
qgsfeaturefilter.h
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1 /***************************************************************************
2  qgsfeaturefilter.h
3  ------------------
4  begin : 26-10-2017
5  copyright : (C) 2017 by Patrick Valsecchi
6  email : patrick dot valsecchi at camptocamp dot com
7  ***************************************************************************/
8 
9 /***************************************************************************
10  * *
11  * This program is free software; you can redistribute it and/or modify *
12  * it under the terms of the GNU General Public License as published by *
13  * the Free Software Foundation; either version 2 of the License, or *
14  * (at your option) any later version. *
15  * *
16  ***************************************************************************/
17 
18 #ifndef QGSFEATUREFILTER_H
19 #define QGSFEATUREFILTER_H
20 
22 #include "qgis_server.h"
23 
24 #include <QMap>
25 
26 class QgsExpression;
27 
34 class SERVER_EXPORT QgsFeatureFilter : public QgsFeatureFilterProvider
35 {
36  public:
38  QgsFeatureFilter() = default;
39 
45  void filterFeatures( const QgsVectorLayer *layer, QgsFeatureRequest &filterFeatures ) const override;
46 
47  QStringList layerAttributes( const QgsVectorLayer *layer, const QStringList &attributes ) const override;
48 
53  QgsFeatureFilterProvider *clone() const override SIP_FACTORY;
54 
60  void setFilter( const QgsVectorLayer *layer, const QgsExpression &expression );
61 
62  private:
63  QMap<QString, QString> mFilters;
64 
65 };
66 
67 #endif
Class for parsing and evaluation of expressions (formerly called "search strings").
Abstract interface for use by classes that filter the features or attributes of a layer.
virtual void filterFeatures(const QgsVectorLayer *layer, QgsFeatureRequest &featureRequest) const =0
Add additional filters to the feature request to further restrict the features returned by the reques...
virtual QgsFeatureFilterProvider * clone() const =0
Create a clone of the feature filter provider.
virtual QStringList layerAttributes(const QgsVectorLayer *layer, const QStringList &attributes) const =0
Returns the list of visible attribute names from a list of attributes names for the given layer.
A feature filter provider allowing to set filter expressions on a per-layer basis.
QgsFeatureFilter()=default
Constructor.
This class wraps a request for features to a vector layer (or directly its vector data provider).
Represents a vector layer which manages a vector based data sets.
#define SIP_FACTORY
Definition: qgis_sip.h:76