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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. *
* *
***************************************************************************/
#include "qgsogrprovider.h"
#include "qgslogger.h"
#include "qgsmessagelog.h"
#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 <cpl_conv.h>
#include <limits>
#include <QtDebug>
#include <QFile>
#include <QDir>
#include <QFileInfo>
#include <QMap>
#include <QString>
#include <QTextCodec>
#include <QSettings>
#include "qgsapplication.h"
#include "qgsdataitem.h"
#include "qgsdataprovider.h"
#include "qgsfeature.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgscoordinatereferencesystem.h"
#include "qgsvectorlayerimport.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" )
+ ")";
class QgsCPLErrorHandler
{
static void CPL_STDCALL showError( CPLErr errClass, int errNo, const char *msg )
{
if ( errNo != OGRERR_NONE )
QgsMessageLog::logMessage( QObject::tr( "OGR[%1] error %2: %3" ).arg( errClass ).arg( errNo ).arg( msg ), QObject::tr( "OGR" ) );
}
public:
QgsCPLErrorHandler()
{
CPLPushErrorHandler( showError );
}
~QgsCPLErrorHandler()
{
CPLPopErrorHandler();
}
};
bool QgsOgrProvider::convertField( QgsField &field, const QTextCodec &encoding )
{
OGRFieldType ogrType = OFTString; //default to string
int ogrWidth = field.length();
int ogrPrecision = field.precision();
switch ( field.type() )
{
case QVariant::LongLong:
ogrType = OFTString;
ogrWidth = ogrWidth > 0 && ogrWidth <= 21 ? ogrWidth : 21;
ogrPrecision = -1;
break;
case QVariant::String:
ogrType = OFTString;
if ( ogrWidth < 0 || ogrWidth > 255 )
ogrWidth = 255;
break;
case QVariant::Int:
ogrType = OFTInteger;
ogrWidth = ogrWidth > 0 && ogrWidth <= 10 ? ogrWidth : 10;
ogrPrecision = 0;
break;
case QVariant::Double:
ogrType = OFTReal;
break;
default:
return false;
}
field.setTypeName( encoding.toUnicode( OGR_GetFieldTypeName( ogrType ) ) );
field.setLength( ogrWidth );
field.setPrecision( ogrPrecision );
return true;
}
QgsVectorLayerImport::ImportError QgsOgrProvider::createEmptyLayer(
const QString& uri,
const QgsFieldMap &fields,
QGis::WkbType wkbType,
const QgsCoordinateReferenceSystem *srs,
bool overwrite,
QMap<int, int> *oldToNewAttrIdxMap,
QString *errorMessage,
const QMap<QString, QVariant> *options )
{
QString encoding;
QString driverName = "ESRI Shapefile";
QStringList dsOptions, layerOptions;
if ( options )
{
if ( options->contains( "fileEncoding" ) )
encoding = options->value( "fileEncoding" ).toString();
if ( options->contains( "driverName" ) )
driverName = options->value( "driverName" ).toString();
if ( options->contains( "datasourceOptions" ) )
dsOptions << options->value( "datasourceOptions" ).toStringList();
if ( options->contains( "layerOptions" ) )
layerOptions << options->value( "layerOptions" ).toStringList();
}
if ( oldToNewAttrIdxMap )
oldToNewAttrIdxMap->clear();
if ( errorMessage )
errorMessage->clear();
if ( !overwrite )
{
QFileInfo fi( uri );
if ( fi.exists() )
{
if ( errorMessage )
*errorMessage += QObject::tr( "Unable to create the datasource. %1 exists and overwrite flag is false." )
.arg( uri );
return QgsVectorLayerImport::ErrCreateDataSource;
}
}
QgsVectorFileWriter *writer = new QgsVectorFileWriter(
uri, encoding, fields, wkbType,
srs, driverName, dsOptions, layerOptions );
QgsVectorFileWriter::WriterError error = writer->hasError();
if ( error )
{
if ( errorMessage )
*errorMessage += writer->errorMessage();
delete writer;
return ( QgsVectorLayerImport::ImportError ) error;
}
if ( oldToNewAttrIdxMap )
{
QMap<int, int> attrIdxMap = writer->attrIdxToOgrIdx();
for ( QMap<int, int>::const_iterator attrIt = attrIdxMap.begin(); attrIt != attrIdxMap.end(); ++attrIt )
{
oldToNewAttrIdxMap->insert( attrIt.key(), *attrIt );
}
}
delete writer;
return QgsVectorLayerImport::NoError;
}
QgsOgrProvider::QgsOgrProvider( QString const & uri )
: QgsVectorDataProvider( uri )
, ogrDataSource( 0 )
, extent_( 0 )
, ogrLayer( 0 )
, ogrOrigLayer( 0 )
, ogrDriver( 0 )
, valid( false )
, featuresCounted( -1 )
{
QgsCPLErrorHandler handler;
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
{
QStringList theURIParts = uri.split( "|" );
mFilePath = theURIParts.at( 0 );
for ( int i = 1 ; i < theURIParts.size(); i++ )
{
QString part = theURIParts.at( i );
int pos = part.indexOf( "=" );
QString field = part.left( pos );
QString value = part.mid( pos + 1 );
if ( field == "layerid" )
{
bool ok;
mLayerIndex = value.toInt( &ok );
if ( ! ok )
{
mLayerIndex = -1;
}
}
else if ( field == "layername" )
{
mLayerName = value;
}
if ( field == "subset" )
{
mSubsetString = value;
}
}
}
bool openReadOnly = false;
// Try to open using VSIFileHandler
// see http://trac.osgeo.org/gdal/wiki/UserDocs/ReadInZip
if ( mFilePath.endsWith( ".zip", Qt::CaseInsensitive ) )
{
// GDAL>=1.8.0 has write support for zip, but read and write operations
// cannot be interleaved, so for now just use read-only.
openReadOnly = true;
if ( !mFilePath.startsWith( "/vsizip/" ) )
mFilePath = "/vsizip/" + mFilePath;
QgsDebugMsg( QString( "Trying /vsizip syntax, mFilePath= %1" ).arg( mFilePath ) );
}
else if ( mFilePath.endsWith( ".gz", Qt::CaseInsensitive ) )
{
if ( !mFilePath.startsWith( "/vsigzip/" ) )
mFilePath = "/vsigzip/" + mFilePath;
QgsDebugMsg( QString( "Trying /vsigzip syntax, mFilePath= %1" ).arg( mFilePath ) );
}
QgsDebugMsg( "mFilePath: " + mFilePath );
QgsDebugMsg( "mLayerIndex: " + QString::number( mLayerIndex ) );
QgsDebugMsg( "mLayerName: " + mLayerName );
QgsDebugMsg( "mSubsetString: " + mSubsetString );
CPLSetConfigOption( "OGR_ORGANIZE_POLYGONS", "ONLY_CCW" ); // "SKIP" returns MULTIPOLYGONs for multiringed POLYGONs
// first try to open in update mode (unless specified otherwise)
if ( !openReadOnly )
ogrDataSource = OGROpen( TO8F( mFilePath ), true, &ogrDriver );
if ( !ogrDataSource )
{
QgsDebugMsg( "OGR failed to opened in update mode, trying in read-only mode" );
// try to open read-only
ogrDataSource = OGROpen( TO8F( mFilePath ), 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 )
{
QgsDebugMsg( "OGR opened using Driver " + QString( OGR_Dr_GetName( ogrDriver ) ) );
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, TO8( mLayerName ) );
}
ogrLayer = ogrOrigLayer;
if ( ogrLayer )
{
valid = setSubsetString( mSubsetString );
QgsDebugMsg( "Data source is valid" );
}
else
{
QgsMessageLog::logMessage( tr( "Data source is invalid, no layer found (%1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ), tr( "OGR" ) );
}
}
else
{
QgsMessageLog::logMessage( tr( "Data source is invalid (%1)" ).arg( QString::fromUtf8( CPLGetLastErrorMsg() ) ), tr( "OGR" ) );
}
// FIXME: sync with app/qgsnewvectorlayerdialog.cpp
mNativeTypes
<< QgsVectorDataProvider::NativeType( tr( "Whole number (integer)" ), "integer", QVariant::Int, 1, 10 )
<< QgsVectorDataProvider::NativeType( tr( "Decimal number (real)" ), "double", QVariant::Double, 1, 20, 0, 15 )
<< QgsVectorDataProvider::NativeType( tr( "Text (string)" ), "string", QVariant::String, 1, 255 )
;
}
QgsOgrProvider::~QgsOgrProvider()
{
if ( ogrLayer != ogrOrigLayer )
{
OGR_DS_ReleaseResultSet( ogrDataSource, ogrLayer );
}
OGR_DS_Destroy( ogrDataSource );
ogrDataSource = 0;
if ( extent_ )
{
free( extent_ );
extent_ = 0;
}
if ( mSelectionRectangle )
{
OGR_G_DestroyGeometry( mSelectionRectangle );
mSelectionRectangle = 0;
}
}
bool QgsOgrProvider::setSubsetString( QString theSQL, bool updateFeatureCount )
{
QgsCPLErrorHandler handler;
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( FROM8( OGR_FD_GetName( OGR_L_GetLayerDefn( ogrOrigLayer ) ) ) ) )
.arg( mSubsetString );
QgsDebugMsg( QString( "SQL: %1" ).arg( sql ) );
ogrLayer = OGR_DS_ExecuteSQL( ogrDataSource, mEncoding->fromUnicode( sql ).constData(), NULL, NULL );
if ( !ogrLayer )
{
pushError( tr( "OGR[%1] error %2: %3" ).arg( CPLGetLastErrorType() ).arg( CPLGetLastErrorNo() ).arg( CPLGetLastErrorMsg() ) );
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!
if ( updateFeatureCount )
{
recalculateFeatureCount();
}
// check the validity of the layer
QgsDebugMsg( "checking validity" );
loadFields();
QgsDebugMsg( "Done checking validity" );
if ( extent_ )
{
free( extent_ );
extent_ = 0;
}
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 = FROM8( 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 )
{
#if defined(OLCStringsAsUTF8)
if ( !OGR_L_TestCapability( ogrLayer, OLCStringsAsUTF8 ) )
{
QgsVectorDataProvider::setEncoding( e );
}
else
{
QgsVectorDataProvider::setEncoding( "UTF-8" );
}
#else
QgsVectorDataProvider::setEncoding( e );
#endif
loadFields();
}
// This is reused by dataItem
int QgsOgrProvider::getOgrGeomType( OGRLayerH ogrLayer )
{
OGRFeatureDefnH fdef = OGR_L_GetLayerDefn( ogrLayer );
int geomType = wkbUnknown;
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 );
}
}
return geomType;
}
void QgsOgrProvider::loadFields()
{
//the attribute fields need to be read again when the encoding changes
mAttributeFields.clear();
geomType = getOgrGeomType( ogrLayer );
OGRFeatureDefnH fdef = OGR_L_GetLayerDefn( ogrLayer );
if ( fdef )
{
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(
//TODO: fix this hack
#ifdef ANDROID
OGR_Fld_GetNameRef( fldDef ),
#else
mEncoding->toUnicode( OGR_Fld_GetNameRef( fldDef ) ),
#endif
varType,
#ifdef ANDROID
OGR_GetFieldTypeName( ogrType ),
#else
mEncoding->toUnicode( OGR_GetFieldTypeName( ogrType ) ),
#endif
OGR_Fld_GetWidth( fldDef ),
OGR_Fld_GetPrecision( fldDef ) ) );
}
}
}
QString QgsOgrProvider::storageType() const
{
// Delegate to the driver loaded in by OGR
return ogrDriverName;
}
void QgsOgrProvider::setRelevantFields( bool fetchGeometry, const QgsAttributeList &fetchAttributes )
{
#if defined(GDAL_VERSION_NUM) && GDAL_VERSION_NUM >= 1800
if ( OGR_L_TestCapability( ogrLayer, OLCIgnoreFields ) )
{
QVector<const char*> ignoredFields;
OGRFeatureDefnH featDefn = OGR_L_GetLayerDefn( ogrLayer );
for ( int i = 0; i < mAttributeFields.size(); i++ )
{
if ( !fetchAttributes.contains( i ) )
{
// add to ignored fields
ignoredFields.append( OGR_Fld_GetNameRef( OGR_FD_GetFieldDefn( featDefn, i ) ) );
}
}
if ( !fetchGeometry )
ignoredFields.append( "OGR_GEOMETRY" );
ignoredFields.append( "OGR_STYLE" ); // not used by QGIS
ignoredFields.append( NULL );
OGR_L_SetIgnoredFields( ogrLayer, ignoredFields.data() );
}
// mark that relevant fields may not be set appropriately for nextFeature() calls
mRelevantFieldsForNextFeature = false;
#else
Q_UNUSED( fetchGeometry );
Q_UNUSED( fetchAttributes );
#endif
}
bool QgsOgrProvider::featureAtId( QgsFeatureId featureId,
QgsFeature& feature,
bool fetchGeometry,
QgsAttributeList fetchAttributes )
{
setRelevantFields( fetchGeometry, fetchAttributes );
OGRFeatureH fet = OGR_L_GetFeature( ogrLayer, FID_TO_NUMBER( featureId ) );
if ( !fet )
return false;
feature.setFeatureId( OGR_F_GetFID( fet ) );
feature.clearAttributeMap();
// skip features without geometry
if ( !OGR_F_GetGeometryRef( fet ) && !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 )
{
QgsMessageLog::logMessage( tr( "Read attempt on an invalid OGR data source" ), tr( "OGR" ) );
return false;
}
if ( !mRelevantFieldsForNextFeature )
{
// setting relevant fields has some overhead so set it only when necessary
setRelevantFields( mFetchGeom || mUseIntersect || !mFetchRect.isEmpty(),
mAttributesToFetch );
mRelevantFieldsForNextFeature = true;
}
OGRFeatureH fet;
QgsRectangle selectionRect;
while (( fet = OGR_L_GetNextFeature( ogrLayer ) ) )
{
// skip features without geometry
if ( !mFetchFeaturesWithoutGeom && !OGR_F_GetGeometryRef( fet ) )
{
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.clearAttributeMap();
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 )
{
if ( geometryType() == QGis::WKBNoGeometry )
{
fetchGeometry = false;
}
mUseIntersect = useIntersect;
mAttributesToFetch = fetchAttributes;
mFetchGeom = fetchGeometry;
mFetchRect = rect;
setRelevantFields( mFetchGeom || mUseIntersect || !mFetchRect.isEmpty(),
mAttributesToFetch );
mRelevantFieldsForNextFeature = true;
// 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 )
return 0;
// 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()
{
if ( !extent_ )
{
extent_ = calloc( sizeof( OGREnvelope ), 1 );
// get the extent_ (envelope) of the layer
QgsDebugMsg( "Starting get extent" );
// TODO: This can be expensive, do we really need it!
if ( ogrLayer == ogrOrigLayer )
{
OGR_L_GetExtent( ogrLayer, ( OGREnvelope * ) extent_, true );
}
else
{
OGREnvelope *bb = static_cast<OGREnvelope*>( extent_ );
bb->MinX = std::numeric_limits<double>::max();
bb->MinY = std::numeric_limits<double>::max();
bb->MaxX = -std::numeric_limits<double>::max();
bb->MaxY = -std::numeric_limits<double>::max();
OGRFeatureH f;
OGR_L_ResetReading( ogrLayer );
while (( f = OGR_L_GetNextFeature( ogrLayer ) ) )
{
OGRGeometryH g = OGR_F_GetGeometryRef( f );
if ( g )
{
OGREnvelope env;
OGR_G_GetEnvelope( g, &env );
if ( env.MinX < bb->MinX ) bb->MinX = env.MinX;
if ( env.MinY < bb->MinY ) bb->MinY = env.MinY;
if ( env.MaxX > bb->MaxX ) bb->MaxX = env.MaxX;
if ( env.MaxY > bb->MaxY ) bb->MaxY = env.MaxY;
}
OGR_F_Destroy( f );
}
OGR_L_ResetReading( ogrLayer );
}
QgsDebugMsg( "Finished get extent" );
}
OGREnvelope *ext = static_cast<OGREnvelope *>( extent_ );
mExtentRect.set( ext->MinX, ext->MinY, ext->MaxX, ext->MaxY );
return mExtentRect;
}
void QgsOgrProvider::updateExtents()
{
if ( extent_ )
{
free( extent_ );
extent_ = 0;
}
}
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 );
if ( f.geometry() && f.geometry()->wkbSize() > 0 )
{
unsigned char* wkb = f.geometry()->asWkb();
OGRGeometryH geom = NULL;