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qgsogrprovider.cpp
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qgsogrprovider.cpp
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/***************************************************************************
qgsogrprovider.cpp Data provider for OGR supported formats
Formerly known as qgsshapefileprovider.cpp
begin : Oct 29, 2003
copyright : (C) 2003 by Gary E.Sherman
email : sherman at mrcc.com
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
/* $Id$ */
#include "qgsogrprovider.h"
#include <iostream>
#include <cfloat>
#include <cassert>
#include <gdal.h> // to collect version information
#include <ogrsf_frmts.h>
#include <ogr_geometry.h>
#include <ogr_spatialref.h>
#include <cpl_error.h>
#include "ogr_api.h"//only for a test
#include <Q3CString>
#include <QtDebug>
#include <QFile>
#include <QFileInfo>
#include <QMap>
#include <QString>
//TODO Following ifndef can be removed once WIN32 GEOS support
// is fixed
#ifndef NOWIN32GEOSXXX
//XXX GEOS support on windows is broken until we can get VC++ to
// tolerate geos.h without throwing a bunch of type errors. It
// appears that the windows version of GEOS may be compiled with
// MINGW rather than VC++.
#endif
#include "qgsapplication.h"
#include "qgsdataprovider.h"
#include "qgsfeature.h"
#include "qgsfeatureattribute.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgsspatialrefsys.h"
#include "qgis.h"
#ifdef WIN32
#define QGISEXTERN extern "C" __declspec( dllexport )
#else
#define QGISEXTERN extern "C"
#endif
static const QString TEXT_PROVIDER_KEY = "ogr";
static const QString TEXT_PROVIDER_DESCRIPTION =
QString("OGR data provider")
+ " (compiled against GDAL/OGR library version "
+ GDAL_RELEASE_NAME
+ ", running against GDAL/OGR library version "
+ GDALVersionInfo("RELEASE_NAME")
+ ")";
QgsOgrProvider::QgsOgrProvider(QString const & uri)
: QgsVectorDataProvider(uri),
ogrDataSource(0),
extent_(0),
ogrLayer(0),
ogrDriver(0),
minmaxcachedirty(true)
{
OGRRegisterAll();
// set the selection rectangle pointer to 0
mSelectionRectangle = 0;
// make connection to the data source
QgsDebugMsg("Data source uri is " + uri);
// try to open for update, but disable error messages to avoid a
// message if the file is read only, because we cope with that
// ourselves.
CPLPushErrorHandler(&CPLQuietErrorHandler);
ogrDataSource = OGRSFDriverRegistrar::Open(QFile::encodeName(uri).constData(), TRUE, &ogrDriver);
CPLPopErrorHandler();
if(ogrDataSource == NULL)
{
// try to open read-only
ogrDataSource = OGRSFDriverRegistrar::Open(QFile::encodeName(uri).constData(), FALSE, &ogrDriver);
//TODO Need to set a flag or something to indicate that the layer
//TODO is in read-only mode, otherwise edit ops will fail
// TODO: capabilities() should now reflect this; need to test.
}
if (ogrDataSource != NULL) {
QgsDebugMsg("Data source is valid");
QgsDebugMsg("OGR Driver was " + QString(ogrDriver->GetName()));
valid = true;
ogrDriverName = ogrDriver->GetName();
ogrLayer = ogrDataSource->GetLayer(0);
// get the extent_ (envelope) of the layer
QgsDebugMsg("Starting get extent\n");
extent_ = new OGREnvelope();
ogrLayer->GetExtent(extent_);
QgsDebugMsg("Finished get extent\n");
// getting the total number of features in the layer
numberFeatures = ogrLayer->GetFeatureCount();
// check the validity of the layer
QgsDebugMsg("checking validity\n");
loadFields();
QgsDebugMsg("Done checking validity\n");
} else {
QgsLogger::critical("Data source is invalid");
const char *er = CPLGetLastErrorMsg();
QgsLogger::critical(er);
valid = false;
}
//resize the cache matrix
minmaxcache=new double*[fieldCount()];
for(uint i=0;i<fieldCount();i++)
{
minmaxcache[i]=new double[2];
}
// create the geos objects
geometryFactory = new GEOS_GEOM::GeometryFactory();
assert(geometryFactory!=0);
// create the reader
// std::cerr << "Creating the wktReader\n";
wktReader = new GEOS_IO::WKTReader(geometryFactory);
/* TODO: [MD]
mNumericalTypes.push_back("Integer");
mNumericalTypes.push_back("Real");
mNonNumericalTypes.push_back("String");
*/
}
QgsOgrProvider::~QgsOgrProvider()
{
for(uint i=0;i<fieldCount();i++)
{
delete[] minmaxcache[i];
}
delete[] minmaxcache;
OGRDataSource::DestroyDataSource(ogrDataSource);
ogrDataSource = 0;
delete extent_;
extent_ = 0;
delete geometryFactory;
delete wktReader;
}
void QgsOgrProvider::setEncoding(const QString& e)
{
QgsVectorDataProvider::setEncoding(e);
loadFields();
}
void QgsOgrProvider::loadFields()
{
//the attribute fields need to be read again when the encoding changes
mAttributeFields.clear();
OGRFeatureDefn* fdef = ogrLayer->GetLayerDefn();
if(fdef)
{
geomType = fdef->GetGeomType();
//Some ogr drivers (e.g. GML) are not able to determine the geometry type of a layer like this.
//In such cases, we examine the first feature
if(geomType == wkbUnknown)
{
ogrLayer->ResetReading();
OGRFeature* firstFeature = ogrLayer->GetNextFeature();
if(firstFeature)
{
OGRGeometry* firstGeometry = firstFeature->GetGeometryRef();
if(firstGeometry)
{
geomType = firstGeometry->getGeometryType();
}
}
ogrLayer->ResetReading();
}
for(int i=0;i<fdef->GetFieldCount();++i)
{
OGRFieldDefn *fldDef = fdef->GetFieldDefn(i);
OGRFieldType type = fldDef->GetType();
bool numeric = (type == OFTInteger || type == OFTReal);
mAttributeFields.insert(i, QgsField(
mEncoding->toUnicode(fldDef->GetNameRef()),
mEncoding->toUnicode(fldDef->GetFieldTypeName(type)),
fldDef->GetWidth(),
fldDef->GetPrecision(),
numeric));
}
}
}
QString QgsOgrProvider::storageType() const
{
// Delegate to the driver loaded in by OGR
return ogrDriverName;
}
bool QgsOgrProvider::getNextFeature(QgsFeature& feature,
bool fetchGeometry,
QgsAttributeList fetchAttributes,
uint featureQueueSize)
{
if (!valid)
{
QgsLogger::warning("Read attempt on an invalid shapefile data source");
return false;
}
OGRFeature *fet;
// skip features without geometry
while ((fet = ogrLayer->GetNextFeature()) != NULL)
{
if (fet->GetGeometryRef() != NULL || mFetchFeaturesWithoutGeom)
{
break;
}
delete fet;
/* TODO: [MD]
if (mUseIntersect)
{
GEOS_GEOM::Geometry *geosGeom = 0;
geosGeom = f->geometry()->geosGeometry();
assert(geosGeom != 0);
char *sWkt = new char[2 * mSelectionRectangle->WkbSize()];
mSelectionRectangle->exportToWkt(&sWkt);
GEOS_GEOM::Geometry *geosRect = wktReader->read(sWkt);
assert(geosRect != 0);
try // geos might throw exception on error
{
if(geosGeom->intersects(geosRect))
{
returnval=true;
}
}
catch (GEOS_UTIL::TopologyException* e)
{
#if GEOS_VERSION_MAJOR < 3
QString error = e->toString().c_str();
#else
QString error = e->what();
#endif
QString error = e->toString().c_str();
QgsLogger::warning("GEOS: " + error);
}
if (returnval)
{
QgsDebugMsg("intersection found");
delete[] sWkt;
delete geosGeom;
break;
}
else
{
QgsDebugMsg("no intersection found");
delete[] sWkt;
delete geosGeom;
delete f;
f=0;
}
}*/
}
if (fet)
{
// get type name
OGRFeatureDefn * featureDefinition = fet->GetDefnRef();
QString featureTypeName =
featureDefinition ? QString(featureDefinition->GetName()) : QString("");
feature = QgsFeature(fet->GetFID(), featureTypeName);
if (fetchGeometry)
{
OGRGeometry *geom = fet->GetGeometryRef();
// get the wkb representation
unsigned char *wkb = new unsigned char[geom->WkbSize()];
geom->exportToWkb((OGRwkbByteOrder) QgsApplication::endian(), wkb);
feature.setGeometryAndOwnership(wkb, geom->WkbSize());
}
for(QgsAttributeList::iterator it = fetchAttributes.begin(); it != fetchAttributes.end(); ++it)
{
getFeatureAttribute(fet,feature,*it);
}
delete fet;
return true;
}
else
{
QgsDebugMsg("Feature is null");
// probably should reset reading here
ogrLayer->ResetReading();
return false;
}
}
/**
* Select features based on a bounding rectangle. Features can be retrieved
* with calls to getFirstFeature and getNextFeature.
* @param mbr QgsRect containing the extent to use in selecting features
* @param useIntersect If true, an intersect test will be used in selecting
* features. In OGR, this is a two pass affair. The mUseIntersect value is
* stored. If true, a secondary filter (using GEOS) is applied to each
* feature in the getNextFeature function.
*/
void QgsOgrProvider::select(QgsRect rect, bool useIntersect)
{
mUseIntersect = useIntersect;
// spatial query to select features
#ifdef QGISDEBUG
QgsLogger::debug<QgsRect>("Selection rectangle is: ", rect, __FILE__, __FUNCTION__, __LINE__, 1);
#endif
OGRGeometry *filter = 0;
filter = OGRGeometryFactory::createGeometry(wkbPolygon);
QString wktExtent = QString("POLYGON ((%1))").arg(rect.asPolygon());
const char *wktText = (const char *)wktExtent;
if(useIntersect)
{
// store the selection rectangle for use in filtering features during
// an identify and display attributes
delete mSelectionRectangle;
mSelectionRectangle = new OGRPolygon();
mSelectionRectangle->importFromWkt((char **)&wktText);
}
// reset the extent for the ogr filter
wktExtent = QString("POLYGON ((%1))").arg(rect.asPolygon());
wktText = (const char *)wktExtent;
OGRErr result = ((OGRPolygon *) filter)->importFromWkt((char **)&wktText);
//TODO - detect an error in setting the filter and figure out what to
//TODO about it. If setting the filter fails, all records will be returned
if (result == OGRERR_NONE)
{
QgsDebugMsg("Setting spatial filter using " + wktExtent);
ogrLayer->SetSpatialFilter(filter);
//ogrLayer->SetSpatialFilterRect(rect->xMin(), rect->yMin(), rect->xMax(), rect->yMax());
}else{
#ifdef QGISDEBUG
QgsLogger::warning("Setting spatial filter failed!");
#endif
}
OGRGeometryFactory::destroyGeometry(filter);
} // QgsOgrProvider::select
unsigned char * QgsOgrProvider::getGeometryPointer(OGRFeature *fet)
{
OGRGeometry *geom = fet->GetGeometryRef();
unsigned char *gPtr=0;
// get the wkb representation
gPtr = new unsigned char[geom->WkbSize()];
geom->exportToWkb((OGRwkbByteOrder) QgsApplication::endian(), gPtr);
return gPtr;
}
QgsRect QgsOgrProvider::extent()
{
mExtentRect.set(extent_->MinX, extent_->MinY, extent_->MaxX, extent_->MaxY);
return mExtentRect;
}
size_t QgsOgrProvider::layerCount() const
{
return ogrDataSource->GetLayerCount();
} // QgsOgrProvider::layerCount()
/**
* Return the feature type
*/
QGis::WKBTYPE QgsOgrProvider::geometryType() const
{
return (QGis::WKBTYPE) geomType;
}
/**
* Return the feature type
*/
long QgsOgrProvider::featureCount() const
{
return numberFeatures;
}
/**
* Return the number of fields
*/
uint QgsOgrProvider::fieldCount() const
{
return mAttributeFields.size();
}
void QgsOgrProvider::getFeatureAttribute(OGRFeature * ogrFet, QgsFeature & f, int attindex)
{
OGRFieldDefn *fldDef = ogrFet->GetFieldDefnRef(attindex);
if ( ! fldDef )
{
QgsDebugMsg("ogrFet->GetFieldDefnRef(attindex) returns NULL");
return;
}
QString fld = mEncoding->toUnicode(fldDef->GetNameRef());
QByteArray cstr(ogrFet->GetFieldAsString(attindex));
f.addAttribute(attindex, QgsFeatureAttribute(fld, mEncoding->toUnicode(cstr)));
}
void QgsOgrProvider::getFeatureAttributes(int key, int &row, QgsFeature &f)
{
if(!valid)
{
QgsLogger::critical("Read attempt on an invalid shapefile data source");
return;
}
OGRFeature* fet;
if ((fet = ogrLayer->GetFeature(key)) != NULL)
{
int count = fet->GetFieldCount();
for (int i = 0; i < count; i++)
getFeatureAttribute(fet, f, i);
delete fet;
}
}
void QgsOgrProvider::getFeatureGeometry(int key, QgsFeature *f)
{
if(!valid)
{
QgsLogger::critical("Read attempt on an invalid shapefile data source");
return;
}
OGRFeature* fet;
OGRGeometry* geom;
if ((fet = ogrLayer->GetFeature(key)) != NULL)
{
if ((geom = fet->GetGeometryRef()))
{
geom = fet->GetGeometryRef();
// get the wkb representation
unsigned char *feature = new unsigned char[geom->WkbSize()];
geom->exportToWkb((OGRwkbByteOrder) QgsApplication::endian(), feature);
OGRFeatureDefn * featureDefinition = fet->GetDefnRef();
QString featureTypeName = featureDefinition ?
QString(featureDefinition->GetName()) :
QString("");
f->setGeometryAndOwnership(feature, geom->WkbSize());
}
delete fet;
}
}
const QgsFieldMap & QgsOgrProvider::fields() const
{
return mAttributeFields;
}
void QgsOgrProvider::reset()
{
ogrLayer->SetSpatialFilter(0);
ogrLayer->ResetReading();
// Reset the use intersect flag on a provider reset, otherwise only the last
// selected feature(s) will be displayed when the attribute table
// is opened.
//XXX In a future release, this "feature" can be used to implement
// the display of only selected records in the attribute table.
mUseIntersect = false;
}
QString QgsOgrProvider::minValue(uint position)
{
if(position>=fieldCount())
{
#ifdef QGISDEBUG
QgsLogger::warning("Warning: access requested to invalid position in QgsOgrProvider::minValue(..)");
#endif
}
if(minmaxcachedirty)
{
fillMinMaxCash();
}
return QString::number(minmaxcache[position][0],'f',2);
}
QString QgsOgrProvider::maxValue(uint position)
{
if(position>=fieldCount())
{
#ifdef QGISDEBUG
QgsLogger::warning("Warning: access requested to invalid position in QgsOgrProvider::maxValue(..)");
#endif
return "";
}
if(minmaxcachedirty)
{
fillMinMaxCash();
}
return QString::number(minmaxcache[position][1],'f',2);
}
void QgsOgrProvider::fillMinMaxCash()
{
for(uint i=0;i<fieldCount();i++)
{
minmaxcache[i][0]=DBL_MAX;
minmaxcache[i][1]=-DBL_MAX;
}
QgsFeature f;
QgsAttributeList all = allAttributesList();
while (getNextFeature(f, false, all))
{
for(uint i = 0; i < fieldCount(); i++)
{
double value = (f.attributeMap())[i].fieldValue().toDouble();
if(value<minmaxcache[i][0])
{
minmaxcache[i][0]=value;
}
if(value>minmaxcache[i][1])
{
minmaxcache[i][1]=value;
}
}
}
minmaxcachedirty=false;
}
//TODO - add sanity check for shape file layers, to include cheking to
// see if the .shp, .dbf, .shx files are all present and the layer
// actually has features
bool QgsOgrProvider::isValid()
{
return valid;
}
bool QgsOgrProvider::addFeature(QgsFeature& f)
{
bool returnValue = true;
OGRFeatureDefn* fdef=ogrLayer->GetLayerDefn();
OGRFeature* feature=new OGRFeature(fdef);
QGis::WKBTYPE ftype = f.geometry()->wkbType();
unsigned char* wkb = f.geometry()->wkbBuffer();
OGRErr err;
switch(ftype)
{
case QGis::WKBPoint:
{
OGRPoint* p=new OGRPoint();
p->importFromWkb(wkb,1+sizeof(int)+2*sizeof(double));
err = feature->SetGeometry(p);
if(err != OGRERR_NONE)
{
delete p;
return false;
}
break;
}
case QGis::WKBLineString:
{
OGRLineString* l=new OGRLineString();
int length;
memcpy(&length,wkb+1+sizeof(int),sizeof(int));
l->importFromWkb(wkb,1+2*sizeof(int)+2*length*sizeof(double));
err = feature->SetGeometry(l);
if(err != OGRERR_NONE)
{
delete l;
return false;
}
break;
}
case QGis::WKBPolygon:
{
OGRPolygon* pol=new OGRPolygon();
int numrings;
int totalnumpoints=0;
int numpoints;//number of points in one ring
unsigned char* ptr=wkb+1+sizeof(int);
memcpy(&numrings,ptr,sizeof(int));
ptr+=sizeof(int);
for(int i=0;i<numrings;++i)
{
memcpy(&numpoints,ptr,sizeof(int));
ptr+=sizeof(int);
totalnumpoints+=numpoints;
ptr+=(2*sizeof(double));
}
pol->importFromWkb(wkb,1+2*sizeof(int)+numrings*sizeof(int)+totalnumpoints*2*sizeof(double));
err = feature->SetGeometry(pol);
if(err != OGRERR_NONE)
{
delete pol;
return false;
}
break;
}
case QGis::WKBMultiPoint:
{
OGRMultiPoint* multip= new OGRMultiPoint();
int count;
//determine how many points
memcpy(&count,wkb+1+sizeof(int),sizeof(int));
multip->importFromWkb(wkb,1+2*sizeof(int)+count*2*sizeof(double));
err = feature->SetGeometry(multip);
if(err != OGRERR_NONE)
{
delete multip;
return false;
}
break;
}
case QGis::WKBMultiLineString:
{
OGRMultiLineString* multil=new OGRMultiLineString();
int numlines;
memcpy(&numlines,wkb+1+sizeof(int),sizeof(int));
int totalpoints=0;
int numpoints;//number of point in one line
unsigned char* ptr=wkb+9;
for(int i=0;i<numlines;++i)
{
memcpy(&numpoints,ptr,sizeof(int));
ptr+=4;
for(int j=0;j<numpoints;++j)
{
ptr+=16;
totalpoints+=2;
}
}
int size=1+2*sizeof(int)+numlines*sizeof(int)+totalpoints*2*sizeof(double);
multil->importFromWkb(wkb,size);
err = feature->SetGeometry(multil);
if(err != OGRERR_NONE)
{
delete multil;
return false;
}
break;
}
case QGis::WKBMultiPolygon:
{
OGRMultiPolygon* multipol=new OGRMultiPolygon();
int numpolys;
memcpy(&numpolys,wkb+1+sizeof(int),sizeof(int));
int numrings;//number of rings in one polygon
int totalrings=0;
int totalpoints=0;
int numpoints;//number of points in one ring
unsigned char* ptr=wkb+9;
for(int i=0;i<numpolys;++i)
{
memcpy(&numrings,ptr,sizeof(int));
ptr+=4;
for(int j=0;j<numrings;++j)
{
totalrings++;
memcpy(&numpoints,ptr,sizeof(int));
for(int k=0;k<numpoints;++k)
{
ptr+=16;
totalpoints+=2;
}
}
}
int size=1+2*sizeof(int)+numpolys*sizeof(int)+totalrings*sizeof(int)+totalpoints*2*sizeof(double);
multipol->importFromWkb(wkb,size);
err = feature->SetGeometry(multipol);
if(err != OGRERR_NONE)
{
delete multipol;
return false;
}
break;
}
default:
{
QgsLogger::debug("Unknown feature type of: ", (int)(ftype), 1,
__FILE__, __FUNCTION__, __LINE__);
return false;
break;
}
}
QgsAttributeMap attrs = f.attributeMap();
//add possible attribute information
for(int i = 0; i < attrs.size(); ++i)
{
QString s = attrs[i].fieldValue();
//find a matching field for the new attribute
QString newAttribute = attrs[i].fieldName();
int targetAttributeId = fdef->GetFieldIndex(mEncoding->fromUnicode(newAttribute).constData());
if(targetAttributeId == -1)
{
continue;
}
if(!s.isEmpty())
{
if(fdef->GetFieldDefn(targetAttributeId)->GetType()==OFTInteger)
{
feature->SetField(targetAttributeId,s.toInt());
}
else if(fdef->GetFieldDefn(targetAttributeId)->GetType()==OFTReal)
{
feature->SetField(targetAttributeId,s.toDouble());
}
else if(fdef->GetFieldDefn(targetAttributeId)->GetType()==OFTString)
{
#ifdef QGISDEBUG
std::cerr << "Writing string attribute " << newAttribute.toLocal8Bit().data() <<
" with " << s.toLocal8Bit().data() << ", encoding " << mEncoding->name().data() << "\n";
#endif
feature->SetField(targetAttributeId,mEncoding->fromUnicode(s).constData());
}
else
{
QgsLogger::warning("QgsOgrProvider::addFeature, no type found");
}
}
}
if(ogrLayer->CreateFeature(feature)!=OGRERR_NONE)
{
QgsLogger::warning("Writing of the feature failed");
returnValue = false;
}
++numberFeatures;
delete feature;
return returnValue;
}
bool QgsOgrProvider::addFeatures(QgsFeatureList & flist)
{
bool returnvalue=true;
for(QgsFeatureList::iterator it = flist.begin(); it != flist.end(); ++it)
{
if(!addFeature(*it))
{
returnvalue=false;
}
}
// flush features
ogrLayer->SyncToDisk();
return returnvalue;
}
bool QgsOgrProvider::addAttributes(const QgsNewAttributesMap & attributes)
{
bool returnvalue=true;
for(QgsNewAttributesMap::const_iterator iter = attributes.begin(); iter != attributes.end(); ++iter)
{
if(*iter=="OFTInteger")
{
OGRFieldDefn fielddefn(mEncoding->fromUnicode(iter.key()).data(),OFTInteger);
if(ogrLayer->CreateField(&fielddefn)!=OGRERR_NONE)
{
QgsLogger::warning("QgsOgrProvider.cpp: writing of OFTInteger field failed");
returnvalue=false;
}
}
else if(*iter=="OFTReal")
{
OGRFieldDefn fielddefn(mEncoding->fromUnicode(iter.key()).data(),OFTReal);
if(ogrLayer->CreateField(&fielddefn)!=OGRERR_NONE)
{
QgsLogger::warning("QgsOgrProvider.cpp: writing of OFTReal field failed");
returnvalue=false;
}
}
else if(*iter=="OFTString")
{
OGRFieldDefn fielddefn(mEncoding->fromUnicode(iter.key()).data(),OFTString);
if(ogrLayer->CreateField(&fielddefn)!=OGRERR_NONE)
{
QgsLogger::warning("QgsOgrProvider.cpp: writing of OFTString field failed");
returnvalue=false;
}
}
else
{
QgsLogger::warning("QgsOgrProvider::addAttributes, type not found");
returnvalue=false;
}
}
return returnvalue;
}
bool QgsOgrProvider::changeAttributeValues(const QgsChangedAttributesMap & attr_map)
{
for(QgsChangedAttributesMap::const_iterator it = attr_map.begin(); it != attr_map.end(); ++it)
{
long fid = (long) it.key();
OGRFeature *of = ogrLayer->GetFeature ( fid );
if ( !of )
{
QgsLogger::warning("QgsOgrProvider::changeAttributeValues, Cannot read feature, cannot change attributes");
return false;
}
const QgsAttributeMap& attr = it.value();
for( QgsAttributeMap::const_iterator it2 = attr.begin(); it2 != attr.end(); ++it2 )
{
int f = it2.key();
QString name = it2->fieldName();
QString value = it2->fieldValue();
OGRFieldDefn *fd = of->GetFieldDefnRef ( f );
if (fd == NULL)
{
QgsLogger::warning("QgsOgrProvider::changeAttributeValues, Field " + QString::number(f) + " doesn't exist");
continue;
}
OGRFieldType type = fd->GetType();
switch ( type )
{
case OFTInteger:
of->SetField ( f, value.toInt() );
break;
case OFTReal:
of->SetField ( f, value.toDouble() );
break;
case OFTString:
of->SetField ( f, mEncoding->fromUnicode(value).constData() );
break;
default:
QgsLogger::warning("QgsOgrProvider::changeAttributeValues, Unknown field type, cannot change attribute");
break;
}
}
ogrLayer->SetFeature ( of );
}
ogrLayer->SyncToDisk();
return true;
}
bool QgsOgrProvider::changeGeometryValues(QgsGeometryMap & geometry_map)
{
OGRFeature* theOGRFeature = 0;
OGRGeometry* theNewGeometry = 0;
for (QgsGeometryMap::iterator it = geometry_map.begin(); it != geometry_map.end(); ++it)
{
theOGRFeature = ogrLayer->GetFeature(it.key());
if(!theOGRFeature)
{
QgsLogger::warning("QgsOgrProvider::changeGeometryValues, cannot find feature");
continue;
}
//create an OGRGeometry
if (OGRGeometryFactory::createFromWkb(it->wkbBuffer(),
ogrLayer->GetSpatialRef(),
&theNewGeometry,
it->wkbSize()) != OGRERR_NONE)
{
QgsLogger::warning("QgsOgrProvider::changeGeometryValues, error while creating new OGRGeometry");
delete theNewGeometry;
theNewGeometry = 0;
continue;
}
if(!theNewGeometry)
{
QgsLogger::warning("QgsOgrProvider::changeGeometryValues, new geometry is NULL");
continue;
}
//set the new geometry
if(theOGRFeature->SetGeometryDirectly(theNewGeometry) != OGRERR_NONE)
{
QgsLogger::warning("QgsOgrProvider::changeGeometryValues, error while replacing geometry");
delete theNewGeometry;
theNewGeometry = 0;
continue;
}
ogrLayer->SetFeature(theOGRFeature);
}
ogrLayer->SyncToDisk();
return true;
}
bool QgsOgrProvider::createSpatialIndex()
{
QString filename=dataSourceUri().section('/',-1,-1);//find out the filename from the uri
QString layername=filename.section('.',0,0);
QString sql="CREATE SPATIAL INDEX ON "+layername;
ogrDataSource->ExecuteSQL (sql.ascii(), ogrLayer->GetSpatialFilter(),"");
//find out, if the .qix file is there
QString indexname = dataSourceUri();
indexname.truncate(dataSourceUri().length()-filename.length());
indexname=indexname+layername+".qix";
QFile indexfile(indexname);
if(indexfile.exists())
{
return true;
}
else
{
return false;
}
}
bool QgsOgrProvider::deleteFeatures(const QgsFeatureIds & id)
{
bool returnvalue=true;
for (QgsFeatureIds::const_iterator it = id.begin(); it != id.end(); ++it)
{
if(!deleteFeature(*it))
{
returnvalue=false;
}
}
ogrLayer->SyncToDisk();
return returnvalue;
}