/
qgsogrprovider.cpp
1781 lines (1500 loc) · 50.2 KB
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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 "qgslogger.h"
#include <iostream>
#include <cassert>
#define CPL_SUPRESS_CPLUSPLUS
#include <gdal.h> // to collect version information
#include <ogr_api.h>
#include <ogr_srs_api.h>
#include <cpl_error.h>
#include <QtDebug>
#include <QFile>
#include <QDir>
#include <QFileInfo>
#include <QMap>
#include <QString>
#include <QTextCodec>
#include "qgsapplication.h"
#include "qgsdataprovider.h"
#include "qgsfeature.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgslogger.h"
#include "qgscoordinatereferencesystem.h"
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 ),
ogrOrigLayer( 0 ),
ogrDriver( 0 ),
featuresCounted( -1 )
{
QgsApplication::registerOgrDrivers();
// 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.
// This part of the code parses the uri transmitted to the ogr provider to
// get the options the client wants us to apply
// If there is no & in the uri, then the uri is just the filename. The loaded
// layer will be layer 0.
//this is not true for geojson
if ( ! uri.contains( '|', Qt::CaseSensitive ) )
{
mFilePath = uri;
mLayerIndex = 0;
mLayerName = QString::null;
}
else
{
// If we get here, there are some options added to the filename. We must parse
// the different parts separated by &, and among each option, the name and the
// value around the =.
// A valid uri is of the form: filename&option1=value1&option2=value2,...
QStringList theURIParts = uri.split( "|" );
mFilePath = theURIParts.at( 0 );
for ( int i = 1 ; i < theURIParts.size(); i++ )
{
QStringList theInstruction = theURIParts.at( i ).split( "=" );
if ( theInstruction.at( 0 ) == QString( "layerid" ) )
{
bool ok;
mLayerIndex = theInstruction.at( 1 ).toInt( &ok );
if ( ! ok )
{
mLayerIndex = -1;
}
}
if ( theInstruction.at( 0 ) == QString( "layername" ) )
{
mLayerName = theInstruction.at( 1 );
}
if ( theInstruction.at( 0 ) == QString( "subset" ) )
{
mSubsetString = theInstruction.at( 1 );
}
}
}
QgsDebugMsg( "mFilePath: " + mFilePath );
QgsDebugMsg( "mLayerIndex: " + QString::number( mLayerIndex ) );
QgsDebugMsg( "mLayerName: " + mLayerName );
QgsDebugMsg( "mSubsetString: " + mSubsetString );
CPLPushErrorHandler( CPLQuietErrorHandler );
ogrDataSource = OGROpen( QFile::encodeName( mFilePath ).constData(), TRUE, &ogrDriver );
CPLPopErrorHandler();
if ( ogrDataSource == NULL )
{
// try to open read-only
ogrDataSource = OGROpen( QFile::encodeName( mFilePath ).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( OGR_Dr_GetName( ogrDriver ) ) );
valid = true;
ogrDriverName = OGR_Dr_GetName( ogrDriver );
// We get the layer which was requested by the uri. The layername
// has precedence over the layerid if both are given.
if ( mLayerName.isNull() )
{
ogrOrigLayer = OGR_DS_GetLayer( ogrDataSource, mLayerIndex );
}
else
{
ogrOrigLayer = OGR_DS_GetLayerByName( ogrDataSource, mLayerName.toLocal8Bit().data() );
}
extent_ = calloc( sizeof( OGREnvelope ), 1 );
ogrLayer = ogrOrigLayer;
setSubsetString( mSubsetString );
}
else
{
QgsLogger::critical( "Data source is invalid" );
QgsLogger::critical( QString::fromUtf8( CPLGetLastErrorMsg() ) );
valid = false;
}
mNativeTypes
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer)" ), "integer", QVariant::Int, 1, 10 )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (real)" ), "double", QVariant::Double, 1, 20, 0, 5 )
<< QgsVectorDataProvider::NativeType( tr( "Text (string)" ), "string", QVariant::String, 1, 255, 0, 0 )
;
}
QgsOgrProvider::~QgsOgrProvider()
{
if ( ogrLayer != ogrOrigLayer )
{
OGR_DS_ReleaseResultSet( ogrDataSource, ogrLayer );
}
OGR_DS_Destroy( ogrDataSource );
ogrDataSource = 0;
free( extent_ );
extent_ = 0;
if ( mSelectionRectangle )
{
OGR_G_DestroyGeometry( mSelectionRectangle );
mSelectionRectangle = 0;
}
}
bool QgsOgrProvider::setSubsetString( QString theSQL )
{
if ( theSQL == mSubsetString && featuresCounted >= 0 )
return true;
OGRLayerH prevLayer = ogrLayer;
QString prevSubsetString = mSubsetString;
mSubsetString = theSQL;
if ( !mSubsetString.isEmpty() )
{
QString sql = QString( "SELECT * FROM %1 WHERE %2" )
.arg( quotedIdentifier( OGR_FD_GetName( OGR_L_GetLayerDefn( ogrOrigLayer ) ) ) )
.arg( mSubsetString );
ogrLayer = OGR_DS_ExecuteSQL( ogrDataSource, sql.toUtf8().data(), NULL, NULL );
if ( !ogrLayer )
{
ogrLayer = prevLayer;
mSubsetString = prevSubsetString;
return false;
}
}
else
{
ogrLayer = ogrOrigLayer;
}
if ( prevLayer != ogrOrigLayer )
{
OGR_DS_ReleaseResultSet( ogrDataSource, prevLayer );
}
QString uri = mFilePath;
if ( !mLayerName.isNull() )
{
uri += QString( "|layername=%1" ).arg( mLayerName );
}
else if ( mLayerIndex >= 0 )
{
uri += QString( "|layerid=%1" ).arg( mLayerIndex );
}
if ( !mSubsetString.isEmpty() )
{
uri += QString( "|subset=%1" ).arg( mSubsetString );
}
setDataSourceUri( uri );
OGR_L_ResetReading( ogrLayer );
// getting the total number of features in the layer
// TODO: This can be expensive, do we really need it!
featuresCounted = OGR_L_GetFeatureCount( ogrLayer, TRUE );
// get the extent_ (envelope) of the layer
QgsDebugMsg( "Starting get extent" );
// TODO: This can be expensive, do we really need it!
OGR_L_GetExtent( ogrLayer, ( OGREnvelope * ) extent_, TRUE );
QgsDebugMsg( "Finished get extent" );
// check the validity of the layer
QgsDebugMsg( "checking validity" );
loadFields();
QgsDebugMsg( "Done checking validity" );
return true;
}
QString QgsOgrProvider::subsetString()
{
return mSubsetString;
}
QStringList QgsOgrProvider::subLayers() const
{
QStringList theList = QStringList();
if ( ! valid )
{
return theList;
}
for ( unsigned int i = 0; i < layerCount() ; i++ )
{
QString theLayerName = QString::fromLocal8Bit( OGR_FD_GetName( OGR_L_GetLayerDefn( OGR_DS_GetLayer( ogrDataSource, i ) ) ) );
OGRwkbGeometryType layerGeomType = OGR_FD_GetGeomType( OGR_L_GetLayerDefn( OGR_DS_GetLayer( ogrDataSource, i ) ) );
int theLayerFeatureCount = OGR_L_GetFeatureCount( OGR_DS_GetLayer( ogrDataSource, i ), 1 ) ;
QString geom;
switch ( layerGeomType )
{
case wkbUnknown: geom = "Unknown"; break;
case wkbPoint: geom = "Point"; break;
case wkbLineString: geom = "LineString"; break;
case wkbPolygon: geom = "Polygon"; break;
case wkbMultiPoint: geom = "MultiPoint"; break;
case wkbMultiLineString: geom = "MultiLineString"; break;
case wkbGeometryCollection: geom = "GeometryCollection"; break;
case wkbNone: geom = "None"; break;
case wkbPoint25D: geom = "Point25D"; break;
case wkbLineString25D: geom = "LineString25D"; break;
case wkbPolygon25D: geom = "Polygon25D"; break;
case wkbMultiPoint25D: geom = "MultiPoint25D"; break;
case wkbMultiLineString25D: geom = "MultiLineString25D"; break;
case wkbMultiPolygon25D: geom = "MultiPolygon25D"; break;
default: geom="Unknown WKB: " + QString::number( layerGeomType );
}
theList.append( QString::number( i ) + ":" + theLayerName + ":" + QString::number( theLayerFeatureCount ) + ":" + geom );
}
return theList;
}
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();
OGRFeatureDefnH fdef = OGR_L_GetLayerDefn( ogrLayer );
if ( fdef )
{
geomType = OGR_FD_GetGeomType( fdef );
//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 )
{
OGR_L_ResetReading( ogrLayer );
OGRFeatureH firstFeature = OGR_L_GetNextFeature( ogrLayer );
if ( firstFeature )
{
OGRGeometryH firstGeometry = OGR_F_GetGeometryRef( firstFeature );
if ( firstGeometry )
{
geomType = OGR_G_GetGeometryType( firstGeometry );
}
OGR_F_Destroy( firstFeature );
}
OGR_L_ResetReading( ogrLayer );
}
for ( int i = 0; i < OGR_FD_GetFieldCount( fdef ); ++i )
{
OGRFieldDefnH fldDef = OGR_FD_GetFieldDefn( fdef, i );
OGRFieldType ogrType = OGR_Fld_GetType( fldDef );
QVariant::Type varType;
switch ( ogrType )
{
case OFTInteger: varType = QVariant::Int; break;
case OFTReal: varType = QVariant::Double; break;
// unsupported in OGR 1.3
//case OFTDateTime: varType = QVariant::DateTime; break;
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1400
case OFTString: varType = QVariant::String; break;
#endif
default: varType = QVariant::String; // other unsupported, leave it as a string
}
mAttributeFields.insert(
i, QgsField(
mEncoding->toUnicode( OGR_Fld_GetNameRef( fldDef ) ), varType,
mEncoding->toUnicode( OGR_GetFieldTypeName( ogrType ) ),
OGR_Fld_GetWidth( fldDef ),
OGR_Fld_GetPrecision( fldDef ) ) );
}
}
}
QString QgsOgrProvider::storageType() const
{
// Delegate to the driver loaded in by OGR
return ogrDriverName;
}
bool QgsOgrProvider::featureAtId( int featureId,
QgsFeature& feature,
bool fetchGeometry,
QgsAttributeList fetchAttributes )
{
OGRFeatureH fet = OGR_L_GetFeature( ogrLayer, featureId );
if ( fet == NULL )
return false;
feature.setFeatureId( OGR_F_GetFID( fet ) );
// skip features without geometry
if ( OGR_F_GetGeometryRef( fet ) == NULL && !mFetchFeaturesWithoutGeom )
{
OGR_F_Destroy( fet );
return false;
}
/* fetch geometry */
if ( fetchGeometry )
{
OGRGeometryH geom = OGR_F_GetGeometryRef( fet );
// skip features without geometry
// get the wkb representation
unsigned char *wkb = new unsigned char[OGR_G_WkbSize( geom )];
OGR_G_ExportToWkb( geom, ( OGRwkbByteOrder ) QgsApplication::endian(), wkb );
feature.setGeometryAndOwnership( wkb, OGR_G_WkbSize( geom ) );
}
/* fetch attributes */
for ( QgsAttributeList::iterator it = fetchAttributes.begin(); it != fetchAttributes.end(); ++it )
{
getFeatureAttribute( fet, feature, *it );
}
if ( OGR_F_GetGeometryRef( fet ) != NULL )
{
feature.setValid( true );
}
else
{
feature.setValid( false );
}
OGR_F_Destroy( fet );
return true;
}
bool QgsOgrProvider::nextFeature( QgsFeature& feature )
{
feature.setValid( false );
if ( !valid )
{
QgsLogger::warning( "Read attempt on an invalid shapefile data source" );
return false;
}
OGRFeatureH fet;
QgsRectangle selectionRect;
while (( fet = OGR_L_GetNextFeature( ogrLayer ) ) != NULL )
{
// skip features without geometry
if ( !mFetchFeaturesWithoutGeom && OGR_F_GetGeometryRef( fet ) == NULL )
{
OGR_F_Destroy( fet );
continue;
}
OGRFeatureDefnH featureDefinition = OGR_F_GetDefnRef( fet );
QString featureTypeName = featureDefinition ? QString( OGR_FD_GetName( featureDefinition ) ) : QString( "" );
feature.setFeatureId( OGR_F_GetFID( fet ) );
feature.setTypeName( featureTypeName );
/* fetch geometry */
if ( mFetchGeom || mUseIntersect )
{
OGRGeometryH geom = OGR_F_GetGeometryRef( fet );
if ( geom == 0 )
{
OGR_F_Destroy( fet );
continue;
}
// get the wkb representation
unsigned char *wkb = new unsigned char[OGR_G_WkbSize( geom )];
OGR_G_ExportToWkb( geom, ( OGRwkbByteOrder ) QgsApplication::endian(), wkb );
feature.setGeometryAndOwnership( wkb, OGR_G_WkbSize( geom ) );
if ( mUseIntersect )
{
//precise test for intersection with search rectangle
//first make QgsRectangle from OGRPolygon
OGREnvelope env;
memset( &env, 0, sizeof( env ) );
if ( mSelectionRectangle )
OGR_G_GetEnvelope( mSelectionRectangle, &env );
if ( env.MinX != 0 || env.MinY != 0 || env.MaxX != 0 || env.MaxY != 0 ) //if envelope is invalid, skip the precise intersection test
{
selectionRect.set( env.MinX, env.MinY, env.MaxX, env.MaxY );
if ( !feature.geometry()->intersects( selectionRect ) )
{
OGR_F_Destroy( fet );
continue;
}
}
}
}
/* fetch attributes */
for ( QgsAttributeList::iterator it = mAttributesToFetch.begin(); it != mAttributesToFetch.end(); ++it )
{
getFeatureAttribute( fet, feature, *it );
}
/* we have a feature, end this cycle */
break;
} /* while */
if ( fet )
{
if ( OGR_F_GetGeometryRef( fet ) != NULL )
{
feature.setValid( true );
}
else
{
feature.setValid( false );
}
OGR_F_Destroy( fet );
return true;
}
else
{
QgsDebugMsg( "Feature is null" );
// probably should reset reading here
OGR_L_ResetReading( ogrLayer );
return false;
}
}
void QgsOgrProvider::select( QgsAttributeList fetchAttributes, QgsRectangle rect, bool fetchGeometry, bool useIntersect )
{
mUseIntersect = useIntersect;
mAttributesToFetch = fetchAttributes;
mFetchGeom = fetchGeometry;
// spatial query to select features
if ( rect.isEmpty() )
{
OGR_L_SetSpatialFilter( ogrLayer, 0 );
}
else
{
OGRGeometryH filter = 0;
QString wktExtent = QString( "POLYGON((%1))" ).arg( rect.asPolygon() );
QByteArray ba = wktExtent.toAscii();
const char *wktText = ba;
if ( useIntersect )
{
// store the selection rectangle for use in filtering features during
// an identify and display attributes
if ( mSelectionRectangle )
OGR_G_DestroyGeometry( mSelectionRectangle );
OGR_G_CreateFromWkt(( char ** )&wktText, NULL, &mSelectionRectangle );
wktText = ba;
}
OGR_G_CreateFromWkt(( char ** )&wktText, NULL, &filter );
QgsDebugMsg( "Setting spatial filter using " + wktExtent );
OGR_L_SetSpatialFilter( ogrLayer, filter );
OGR_G_DestroyGeometry( filter );
}
//start with first feature
OGR_L_ResetReading( ogrLayer );
}
unsigned char * QgsOgrProvider::getGeometryPointer( OGRFeatureH fet )
{
OGRGeometryH geom = OGR_F_GetGeometryRef( fet );
unsigned char *gPtr = 0;
if ( geom == NULL )
return NULL;
// get the wkb representation
gPtr = new unsigned char[OGR_G_WkbSize( geom )];
OGR_G_ExportToWkb( geom, ( OGRwkbByteOrder ) QgsApplication::endian(), gPtr );
return gPtr;
}
QgsRectangle QgsOgrProvider::extent()
{
OGREnvelope *ext = ( OGREnvelope * ) extent_;
mExtentRect.set( ext->MinX, ext->MinY, ext->MaxX, ext->MaxY );
return mExtentRect;
}
size_t QgsOgrProvider::layerCount() const
{
return OGR_DS_GetLayerCount( ogrDataSource );
} // QgsOgrProvider::layerCount()
/**
* Return the feature type
*/
QGis::WkbType QgsOgrProvider::geometryType() const
{
return ( QGis::WkbType ) geomType;
}
/**
* Return the feature type
*/
long QgsOgrProvider::featureCount() const
{
return featuresCounted;
}
/**
* Return the number of fields
*/
uint QgsOgrProvider::fieldCount() const
{
return mAttributeFields.size();
}
void QgsOgrProvider::getFeatureAttribute( OGRFeatureH ogrFet, QgsFeature & f, int attindex )
{
OGRFieldDefnH fldDef = OGR_F_GetFieldDefnRef( ogrFet, attindex );
if ( ! fldDef )
{
QgsDebugMsg( "ogrFet->GetFieldDefnRef(attindex) returns NULL" );
return;
}
QVariant value;
if ( OGR_F_IsFieldSet( ogrFet, attindex ) )
{
switch ( mAttributeFields[attindex].type() )
{
case QVariant::String: value = QVariant( mEncoding->toUnicode( OGR_F_GetFieldAsString( ogrFet, attindex ) ) ); break;
case QVariant::Int: value = QVariant( OGR_F_GetFieldAsInteger( ogrFet, attindex ) ); break;
case QVariant::Double: value = QVariant( OGR_F_GetFieldAsDouble( ogrFet, attindex ) ); break;
//case QVariant::DateTime: value = QVariant(QDateTime::fromString(str)); break;
default: assert( NULL && "unsupported field type" );
}
}
else
{
value = QVariant( QString::null );
}
f.addAttribute( attindex, value );
}
const QgsFieldMap & QgsOgrProvider::fields() const
{
return mAttributeFields;
}
void QgsOgrProvider::rewind()
{
OGR_L_ResetReading( ogrLayer );
}
//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;
OGRFeatureDefnH fdef = OGR_L_GetLayerDefn( ogrLayer );
OGRFeatureH feature = OGR_F_Create( fdef );
unsigned char* wkb = f.geometry()->asWkb();
if ( f.geometry()->wkbSize() > 0 )
{
OGRGeometryH geom = NULL;
if ( OGR_G_CreateFromWkb( wkb, NULL, &geom, f.geometry()->wkbSize() )
!= OGRERR_NONE )
{
return false;
}
OGR_F_SetGeometryDirectly( feature, geom );
}
QgsAttributeMap attrs = f.attributeMap();
//add possible attribute information
for ( QgsAttributeMap::iterator it = attrs.begin(); it != attrs.end(); ++it )
{
int targetAttributeId = it.key();
// don't try to set field from attribute map if it's not present in layer
if ( targetAttributeId >= OGR_FD_GetFieldCount( fdef ) )
continue;
//if(!s.isEmpty())
// continue;
//
OGRFieldDefnH fldDef = OGR_FD_GetFieldDefn( fdef, targetAttributeId );
OGRFieldType type = OGR_Fld_GetType( fldDef );
if ( it->isNull() || ( type != OFTString && it->toString().isEmpty() ) )
{
OGR_F_UnsetField( feature, targetAttributeId );
}
else
{
switch ( type )
{
case OFTInteger:
OGR_F_SetFieldInteger( feature, targetAttributeId, it->toInt() );
break;
case OFTReal:
OGR_F_SetFieldDouble( feature, targetAttributeId, it->toDouble() );
break;
case OFTString:
QgsDebugMsg( QString( "Writing string attribute %1 with %2, encoding %3" )
.arg( targetAttributeId )
.arg( it->toString() )
.arg( mEncoding->name().data() ) );
OGR_F_SetFieldString( feature, targetAttributeId, mEncoding->fromUnicode( it->toString() ).constData() );
break;
default:
QgsLogger::warning( "QgsOgrProvider::addFeature, no type found" );
break;
}
}
}
if ( OGR_L_CreateFeature( ogrLayer, feature ) != OGRERR_NONE )
{
QgsLogger::warning( "Writing of the feature failed" );
returnValue = false;
}
else
{
f.setFeatureId( OGR_F_GetFID( feature ) );
}
++featuresCounted;
OGR_F_Destroy( 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;
}
}
if ( !syncToDisc() )
{
returnvalue = false;
}
featuresCounted = OGR_L_GetFeatureCount( ogrLayer, TRUE ); //new feature count
return returnvalue;
}
bool QgsOgrProvider::addAttributes( const QList<QgsField> &attributes )
{
bool returnvalue = true;
for ( QList<QgsField>::const_iterator iter = attributes.begin(); iter != attributes.end(); ++iter )
{
OGRFieldType type;
switch ( iter->type() )
{
case QVariant::Int:
type = OFTInteger;
break;
case QVariant::Double:
type = OFTReal;
break;
case QVariant::String:
type = OFTString;
break;
default:
QgsLogger::warning( QString( "QgsOgrProvider::addAttributes, type %1 not found" ).arg( iter->typeName() ) );
returnvalue = false;
continue;
}
OGRFieldDefnH fielddefn = OGR_Fld_Create( mEncoding->fromUnicode( iter->name() ).data(), type );
OGR_Fld_SetWidth( fielddefn, iter->length() );
OGR_Fld_SetPrecision( fielddefn, iter->precision() );
if ( OGR_L_CreateField( ogrLayer, fielddefn, TRUE ) != OGRERR_NONE )
{
QgsLogger::warning( "QgsOgrProvider.cpp: writing of field failed" );
returnvalue = false;
}
OGR_Fld_Destroy( fielddefn );
}
loadFields();
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();
OGRFeatureH of = OGR_L_GetFeature( ogrLayer, 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();
OGRFieldDefnH fd = OGR_F_GetFieldDefnRef( of, f );
if ( fd == NULL )
{
QgsLogger::warning( "QgsOgrProvider::changeAttributeValues, Field " + QString::number( f ) + " doesn't exist" );
continue;
}
OGRFieldType type = OGR_Fld_GetType( fd );
if ( it2->isNull() || ( type != OFTString && it2->toString().isEmpty() ) )
{
OGR_F_UnsetField( of, f );
}
else
{
switch ( type )
{
case OFTInteger:
OGR_F_SetFieldInteger( of, f, it2->toInt() );
break;
case OFTReal:
OGR_F_SetFieldDouble( of, f, it2->toDouble() );
break;
case OFTString:
OGR_F_SetFieldString( of, f, mEncoding->fromUnicode( it2->toString() ).constData() );
break;
default:
QgsLogger::warning( "QgsOgrProvider::changeAttributeValues, Unknown field type, cannot change attribute" );
break;
}
}
}
OGRErr res;
if (( res = OGR_L_SetFeature( ogrLayer, of ) ) != OGRERR_NONE )
{
QgsLogger::warning( "QgsOgrProvider::changeAttributeValues, setting the feature failed: " + QString::number( res ) );
}
}
OGR_L_SyncToDisk( ogrLayer );
return true;
}
bool QgsOgrProvider::changeGeometryValues( QgsGeometryMap & geometry_map )
{
OGRErr res;
OGRFeatureH theOGRFeature = 0;
OGRGeometryH theNewGeometry = 0;
for ( QgsGeometryMap::iterator it = geometry_map.begin(); it != geometry_map.end(); ++it )
{
theOGRFeature = OGR_L_GetFeature( ogrLayer, it.key() );
if ( !theOGRFeature )
{
QgsLogger::warning( "QgsOgrProvider::changeGeometryValues, cannot find feature" );
continue;
}
//create an OGRGeometry
if ( OGR_G_CreateFromWkb( it->asWkb(),
OGR_L_GetSpatialRef( ogrLayer ),
&theNewGeometry,
it->wkbSize() ) != OGRERR_NONE )
{
QgsLogger::warning( "QgsOgrProvider::changeGeometryValues, error while creating new OGRGeometry" );
OGR_G_DestroyGeometry( theNewGeometry );
theNewGeometry = 0;
continue;
}
if ( !theNewGeometry )
{
QgsLogger::warning( "QgsOgrProvider::changeGeometryValues, new geometry is NULL" );
continue;
}
//set the new geometry
if (( res = OGR_F_SetGeometryDirectly( theOGRFeature, theNewGeometry ) ) != OGRERR_NONE )
{
QgsLogger::warning( "QgsOgrProvider::changeGeometryValues, error while replacing geometry: " + QString::number( res ) );
OGR_G_DestroyGeometry( theNewGeometry );
theNewGeometry = 0;
continue;
}
if (( res = OGR_L_SetFeature( ogrLayer, theOGRFeature ) ) != OGRERR_NONE )
{
QgsLogger::warning( "QgsOgrProvider::changeGeometryValues, error while setting feature: " + QString::number( res ) );
OGR_G_DestroyGeometry( theNewGeometry );
theNewGeometry = 0;
continue;
}
OGR_F_Destroy( theOGRFeature );
}
return syncToDisc();
}
bool QgsOgrProvider::createSpatialIndex()
{
QString layerName = OGR_FD_GetName( OGR_L_GetLayerDefn( ogrOrigLayer ) );
QString sql = QString( "CREATE SPATIAL INDEX ON %1" ).arg( quotedIdentifier( layerName ) ); // quote the layer name so spaces are handled
OGR_DS_ExecuteSQL( ogrDataSource, mEncoding->fromUnicode( sql ).data(), OGR_L_GetSpatialFilter( ogrOrigLayer ), "" );
QFileInfo fi( mFilePath ); // to get the base name
//find out, if the .qix file is there
QFile indexfile( fi.path().append( "/" ).append( fi.completeBaseName() ).append( ".qix" ) );
return indexfile.exists();
}
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;
}
}
if ( !syncToDisc() )
{
returnvalue = false;
}
QString layerName = OGR_FD_GetName( OGR_L_GetLayerDefn( ogrOrigLayer ) );
QFileInfo fi( dataSourceUri() ); // to get the base name
QString sql = QString( "REPACK %1" ).arg( layerName ); // don't quote the layer name as it works with spaces in the name and won't work if the name is quoted
OGR_DS_ExecuteSQL( ogrDataSource, mEncoding->fromUnicode( sql ).data(), NULL, NULL );
featuresCounted = OGR_L_GetFeatureCount( ogrLayer, TRUE ); //new feature count
return returnvalue;
}
bool QgsOgrProvider::deleteFeature( int id )
{
OGRErr res = OGR_L_DeleteFeature( ogrLayer, id );
return ( res == OGRERR_NONE );
}
int QgsOgrProvider::capabilities() const
{
int ability = NoCapabilities;
// collect abilities reported by OGR
if ( ogrLayer )
{
// Whilst the OGR documentation (e.g. at
// http://www.gdal.org/ogr/classOGRLayer.html#a17) states "The capability
// codes that can be tested are represented as strings, but #defined
// constants exists to ensure correct spelling", we always use strings
// here. This is because older versions of OGR don't always have all
// the #defines we want to test for here.
if ( OGR_L_TestCapability( ogrLayer, "RandomRead" ) )
// TRUE if the GetFeature() method works *efficiently* for this layer.
// TODO: Perhaps influence if QGIS caches into memory
// (vs read from disk every time) based on this setting.
{