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- isValid() was always returning true when, in fact, occasionally the provider was not in a valid state git-svn-id: http://svn.osgeo.org/qgis/trunk@978 c8812cc2-4d05-0410-92ff-de0c093fc19c
146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
/***************************************************************************
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qgsshapefileprovider.h - Data provider for ESRI shapefile format
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-------------------
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begin : Oct 29, 2003
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copyright : (C) 2003 by Gary E.Sherman
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email : sherman at mrcc.com
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***************************************************************************/
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/***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************/
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/* $Id$ */
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#include "../../src/qgsdataprovider.h"
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class QgsFeature;
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class QgsField;
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class OGRDataSource;
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class OGRLayer;
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/**
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\class QgsShapeFileProvider
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\brief Data provider for ESRI shapefiles
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*/
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class QgsShapeFileProvider:public QgsDataProvider
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{
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public:
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QgsShapeFileProvider(QString uri = 0);
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virtual ~ QgsShapeFileProvider();
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/**
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* Get the first feature resutling from a select operation
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* @return QgsFeature
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*/
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QgsFeature *getFirstFeature(bool fetchAttributes = false);
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/**
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* Get the next feature resutling from a select operation
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* @return QgsFeature
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*/
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QgsFeature *getNextFeature(bool fetchAttributes = false);
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/** Get the feature type. This corresponds to
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WKBPoint,
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WKBLineString,
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WKBPolygon,
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WKBMultiPoint,
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WKBMultiLineString or
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WKBMultiPolygon
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* as defined in qgis.h
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*/
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int geometryType();
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/**
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* Get the number of features in the layer
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*/
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long featureCount();
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/**
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* Get the number of fields in the layer
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*/
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int fieldCount();
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/**
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* Select features based on a bounding rectangle. Features can be retrieved
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* with calls to getFirstFeature and getNextFeature.
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* @param mbr QgsRect containing the extent to use in selecting features
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*/
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void select(QgsRect * mbr, bool useIntersect = false);
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/**
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* Set the data source specification. This may be a path or database
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* connection string
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* @uri data source specification
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*/
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void setDataSourceUri(QString uri);
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/**
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* Get the data source specification. This may be a path or database
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* connection string
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* @return data source specification
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*/
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QString getDataSourceUri();
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/**
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* Identify features within the search radius specified by rect
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* @param rect Bounding rectangle of search radius
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* @return std::vector containing QgsFeature objects that intersect rect
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*/
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virtual std::vector < QgsFeature > &identify(QgsRect * rect);
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/** Return endian-ness for this layer
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*/
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int endian();
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/** Return the extent for this data layer
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*/
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virtual QgsRect *extent();
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/**
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* Get the attributes associated with a feature
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*/
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void getFeatureAttributes(OGRFeature * ogrFet, QgsFeature * f);
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/**
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* Get the field information for the layer
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*/
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std::vector < QgsField > &fields();
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/* Reset the layer - for an OGRLayer, this means clearing the
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* spatial filter and calling ResetReading
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*/
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void reset();
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/**Returns the minimum value of an attribut
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@param position the number of the attribute*/
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QString minValue(int position);
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/**Returns the maximum value of an attribut
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@param position the number of the attribute*/
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QString maxValue(int position);
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/**Returns true if this is a valid shapefile
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*/
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bool isValid();
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private:
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unsigned char *getGeometryPointer(OGRFeature * fet);
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std::vector < QgsField > attributeFields;
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QString dataSourceUri;
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OGRDataSource *ogrDataSource;
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OGREnvelope *extent_;
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OGRLayer *ogrLayer;
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bool valid;
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int geomType;
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long numberFeatures;
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enum ENDIAN
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{
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NDR = 1,
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XDR = 0
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};
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/**Flag indicating, if the minmaxcache should be renewed (true) or not (false)*/
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bool minmaxcachedirty;
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/**Matrix storing the minimum and maximum values*/
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double **minmaxcache;
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/**Fills the cash and sets minmaxcachedirty to false*/
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void fillMinMaxCash();
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};
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