18 #ifndef QGSFEATUREFILTER_H    19 #define QGSFEATUREFILTER_H    22 #include "qgis_server.h"    61     QMap<QString, QString> mFilters;
 Class for parsing and evaluation of expressions (formerly called "search strings"). 
virtual QgsFeatureFilterProvider * clone() const =0
Create a clone of the feature filter provider. 
A feature filter provider allowing to set filter expressions on a per-layer basis. 
This class wraps a request for features to a vector layer (or directly its vector data provider)...
Abstract interface for use by classes that filter the features 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...
Represents a vector layer which manages a vector based data sets.