/
qgswfsprovider.cpp
2284 lines (2034 loc) · 68 KB
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qgswfsprovider.cpp
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/***************************************************************************
qgswfsprovider.cpp
-------------------
begin : July 25, 2006
copyright : (C) 2006 by Marco Hugentobler
email : marco dot hugentobler at karto dot baug dot ethz dot ch
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#define WFS_THRESHOLD 200
#include "qgsapplication.h"
#include "qgsfeature.h"
#include "qgsfield.h"
#include "qgsgeometry.h"
#include "qgscoordinatereferencesystem.h"
#include "qgswfsdata.h"
#include "qgswfsprovider.h"
#include "qgsspatialindex.h"
#include "qgslogger.h"
#include "qgsnetworkaccessmanager.h"
#include <QDomDocument>
#include <QMessageBox>
#include <QDomNodeList>
#include <QNetworkRequest>
#include <QNetworkReply>
#include <QFile>
#include <QUrl>
#include <QWidget>
#include <QPair>
#include <cfloat>
static const QString TEXT_PROVIDER_KEY = "WFS";
static const QString TEXT_PROVIDER_DESCRIPTION = "WFS data provider";
static const QString WFS_NAMESPACE = "http://www.opengis.net/wfs";
static const QString GML_NAMESPACE = "http://www.opengis.net/gml";
QgsWFSProvider::QgsWFSProvider( const QString& uri )
: QgsVectorDataProvider( uri ),
mNetworkRequestFinished( true ),
mUseIntersect( false ),
mSourceCRS( 0 ),
mFeatureCount( 0 ),
mValid( true )
{
mSpatialIndex = 0;
reloadData();
if ( mValid )
{
getLayerCapabilities();
}
}
QgsWFSProvider::~QgsWFSProvider()
{
deleteData();
delete mSpatialIndex;
}
void QgsWFSProvider::reloadData()
{
deleteData();
delete mSpatialIndex;
mSpatialIndex = new QgsSpatialIndex;
mValid = !getFeature( dataSourceUri() );
}
void QgsWFSProvider::deleteData()
{
mSelectedFeatures.clear();
for ( int i = 0; i < mFeatures.size(); i++ )
{
delete mFeatures[i];
}
mFeatures.clear();
}
void QgsWFSProvider::copyFeature( QgsFeature* f, QgsFeature& feature, bool fetchGeometry, QgsAttributeList fetchAttributes )
{
if ( !f )
{
return;
}
//copy the geometry
QgsGeometry* geometry = f->geometry();
unsigned char *geom = geometry->asWkb();
int geomSize = geometry->wkbSize();
unsigned char* copiedGeom = new unsigned char[geomSize];
memcpy( copiedGeom, geom, geomSize );
feature.setGeometryAndOwnership( copiedGeom, geomSize );
//and the attributes
const QgsAttributeMap& attributes = f->attributeMap();
for ( QgsAttributeList::const_iterator it = fetchAttributes.begin(); it != fetchAttributes.end(); ++it )
{
feature.addAttribute( *it, attributes[*it] );
}
//id and valid
feature.setValid( true );
feature.setFeatureId( f->id() );
}
bool QgsWFSProvider::featureAtId( int featureId,
QgsFeature& feature,
bool fetchGeometry,
QgsAttributeList fetchAttributes )
{
QMap<int, QgsFeature* >::iterator it = mFeatures.find( featureId );
if ( it == mFeatures.end() )
{
return false;
}
QgsFeature* f = it.value();
if ( !f )
{
return false;
}
copyFeature( f, feature, fetchGeometry, fetchAttributes );
return true;
}
bool QgsWFSProvider::nextFeature( QgsFeature& feature )
{
feature.setValid( false );
while ( true ) //go through the loop until we find a feature in the filter
{
if ( mSelectedFeatures.size() == 0 || mFeatureIterator == mSelectedFeatures.end() )
{
return 0;
}
QgsFeature* f = mFeatures[*mFeatureIterator];
++mFeatureIterator;
if ( !f )
{
continue;
}
copyFeature( f, feature, true, mAttributesToFetch );
if ( mUseIntersect )
{
if ( feature.geometry() && feature.geometry()->intersects( mSpatialFilter ) )
{
return true;
}
else
{
continue; //go for the next feature
}
}
else
{
return true;
}
}
}
QGis::WkbType QgsWFSProvider::geometryType() const
{
return mWKBType;
}
long QgsWFSProvider::featureCount() const
{
return mFeatureCount;
}
uint QgsWFSProvider::fieldCount() const
{
return mFields.size();
}
const QgsFieldMap & QgsWFSProvider::fields() const
{
return mFields;
}
void QgsWFSProvider::rewind()
{
mFeatureIterator = mSelectedFeatures.begin();
}
QgsCoordinateReferenceSystem QgsWFSProvider::crs()
{
return mSourceCRS;
}
QgsRectangle QgsWFSProvider::extent()
{
return mExtent;
}
bool QgsWFSProvider::isValid()
{
return mValid;
}
void QgsWFSProvider::select( QgsAttributeList fetchAttributes,
QgsRectangle rect,
bool fetchGeometry,
bool useIntersect )
{
mUseIntersect = useIntersect;
mAttributesToFetch = fetchAttributes;
mFetchGeom = fetchGeometry;
if ( rect.isEmpty() )
{
mSpatialFilter = mExtent;
}
else
{
mSpatialFilter = rect;
}
mSelectedFeatures = mSpatialIndex->intersects( mSpatialFilter );
mFeatureIterator = mSelectedFeatures.begin();
}
int QgsWFSProvider::getFeature( const QString& uri )
{
QString geometryAttribute;
//Local url or HTTP?
if ( uri.startsWith( "http" ) )
{
mEncoding = QgsWFSProvider::GET;
}
else
{
mEncoding = QgsWFSProvider::FILE;
}
if ( mEncoding == QgsWFSProvider::FILE )
{
//guess geometry attribute and other attributes from schema or from .gml file
if ( describeFeatureTypeFile( uri, mGeometryAttribute, mFields ) != 0 )
{
return 1;
}
}
else //take schema with describeFeatureType request
{
QString describeFeatureUri = uri;
describeFeatureUri.replace( QString( "GetFeature" ), QString( "DescribeFeatureType" ) );
if ( describeFeatureType( describeFeatureUri, mGeometryAttribute, mFields ) != 0 )
{
return 1;
}
}
if ( mEncoding == QgsWFSProvider::GET )
{
return getFeatureGET( uri, mGeometryAttribute );
}
else//local file
{
return getFeatureFILE( uri, mGeometryAttribute ); //read the features from disk
}
}
bool QgsWFSProvider::addFeatures( QgsFeatureList &flist )
{
//create <Transaction> xml
QDomDocument transactionDoc;
QDomElement transactionElem = createTransactionElement( transactionDoc );
transactionDoc.appendChild( transactionElem );
//find out typename from uri and strip namespace prefix
QString tname = typeNameFromUrl();
if ( tname.isNull() )
{
return false;
}
removeNamespacePrefix( tname );
//Add the features
QgsFeatureList::iterator featureIt = flist.begin();
for ( ; featureIt != flist.end(); ++featureIt )
{
//Insert element
QDomElement insertElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Insert" );
transactionElem.appendChild( insertElem );
QDomElement featureElem = transactionDoc.createElementNS( mWfsNamespace, tname );
//add thematic attributes
QgsAttributeMap featureAttributes = featureIt->attributeMap();
QgsFieldMap::const_iterator fieldIt = mFields.constBegin();
for ( ; fieldIt != mFields.constEnd(); ++fieldIt )
{
QgsAttributeMap::const_iterator valueIt = featureAttributes.find( fieldIt.key() );
if ( valueIt != featureAttributes.constEnd() )
{
QVariant fieldValue = valueIt.value();
if ( fieldValue.isValid() && !fieldValue.isNull() )
{
QDomElement fieldElem = transactionDoc.createElementNS( mWfsNamespace, fieldIt.value().name() );
QDomText fieldText = transactionDoc.createTextNode( fieldValue.toString() );
fieldElem.appendChild( fieldText );
featureElem.appendChild( fieldElem );
}
}
}
//add geometry column (as gml)
QDomElement geomElem = transactionDoc.createElementNS( mWfsNamespace, mGeometryAttribute );
QDomElement gmlElem = createGeometryElem( featureIt->geometry(), transactionDoc );
if ( !gmlElem.isNull() )
{
geomElem.appendChild( gmlElem );
featureElem.appendChild( geomElem );
}
insertElem.appendChild( featureElem );
}
QDomDocument serverResponse;
bool success = sendTransactionDocument( transactionDoc, serverResponse );
if ( !success )
{
return false;
}
if ( transactionSuccess( serverResponse ) )
{
//transaction successful. Add the features to mSpatialIndex
if ( mSpatialIndex )
{
QStringList idList = insertedFeatureIds( serverResponse );
QStringList::const_iterator idIt = idList.constBegin();
featureIt = flist.begin();
for ( ; idIt != idList.constEnd() && featureIt != flist.end(); ++idIt, ++featureIt )
{
int newId = findNewKey();
featureIt->setFeatureId( newId );
mFeatures.insert( newId, new QgsFeature( *featureIt ) );
mIdMap.insert( newId, *idIt );
mSpatialIndex->insertFeature( *featureIt );
mFeatureCount = mFeatures.size();
}
}
return true;
}
else
{
handleException( serverResponse );
return false;
}
}
bool QgsWFSProvider::deleteFeatures( const QgsFeatureIds &id )
{
if ( id.size() < 1 )
{
return true;
}
//find out typename from uri and strip namespace prefix
QString tname = typeNameFromUrl();
if ( tname.isNull() )
{
return false;
}
//create <Transaction> xml
QDomDocument transactionDoc;
QDomElement transactionElem = createTransactionElement( transactionDoc );
transactionDoc.appendChild( transactionElem );
//delete element
QDomElement deleteElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Delete" );
deleteElem.setAttribute( "typeName", tname );
QDomElement filterElem = transactionDoc.createElementNS( "http://www.opengis.net/ogc", "Filter" );
QgsFeatureIds::const_iterator idIt = id.constBegin();
for ( ; idIt != id.constEnd(); ++idIt )
{
//find out feature id
QMap< int, QString >::const_iterator fidIt = mIdMap.find( *idIt );
if ( fidIt == mIdMap.constEnd() )
{
continue;
}
QDomElement featureIdElem = transactionDoc.createElementNS( "http://www.opengis.net/ogc", "FeatureId" );
featureIdElem.setAttribute( "fid", fidIt.value() );
filterElem.appendChild( featureIdElem );
}
deleteElem.appendChild( filterElem );
transactionElem.appendChild( deleteElem );
QDomDocument serverResponse;
bool success = sendTransactionDocument( transactionDoc, serverResponse );
if ( !success )
{
return false;
}
if ( transactionSuccess( serverResponse ) )
{
idIt = id.constBegin();
for ( ; idIt != id.constEnd(); ++idIt )
{
QMap<int, QgsFeature* >::iterator fIt = mFeatures.find( *idIt );
if ( fIt != mFeatures.end() )
{
if ( mSpatialIndex )
{
mSpatialIndex->deleteFeature( *fIt.value() );
}
delete fIt.value();
mFeatures.remove( *idIt );
}
}
return true;
}
else
{
handleException( serverResponse );
return false;
}
}
bool QgsWFSProvider::changeGeometryValues( QgsGeometryMap & geometry_map )
{
//find out typename from uri and strip namespace prefix
QString tname = typeNameFromUrl();
if ( tname.isNull() )
{
return false;
}
//create <Transaction> xml
QDomDocument transactionDoc;
QDomElement transactionElem = createTransactionElement( transactionDoc );
transactionDoc.appendChild( transactionElem );
QgsGeometryMap::iterator geomIt = geometry_map.begin();
for ( ; geomIt != geometry_map.end(); ++geomIt )
{
//find out feature id
QMap< int, QString >::const_iterator fidIt = mIdMap.find( geomIt.key() );
if ( fidIt == mIdMap.constEnd() )
{
continue;
}
QDomElement updateElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Update" );
updateElem.setAttribute( "typeName", tname );
//Property
QDomElement propertyElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Property" );
QDomElement nameElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Name" );
QDomText nameText = transactionDoc.createTextNode( mGeometryAttribute );
nameElem.appendChild( nameText );
propertyElem.appendChild( nameElem );
QDomElement valueElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Value" );
QDomElement gmlElem = createGeometryElem( &geomIt.value(), transactionDoc );
valueElem.appendChild( gmlElem );
propertyElem.appendChild( valueElem );
updateElem.appendChild( propertyElem );
//filter
QDomElement filterElem = transactionDoc.createElementNS( "http://www.opengis.net/ogc", "Filter" );
QDomElement featureIdElem = transactionDoc.createElementNS( "http://www.opengis.net/ogc", "FeatureId" );
featureIdElem.setAttribute( "fid", fidIt.value() );
filterElem.appendChild( featureIdElem );
updateElem.appendChild( filterElem );
transactionElem.appendChild( updateElem );
}
QDomDocument serverResponse;
bool success = sendTransactionDocument( transactionDoc, serverResponse );
if ( !success )
{
return false;
}
if ( transactionSuccess( serverResponse ) )
{
geomIt = geometry_map.begin();
for ( ; geomIt != geometry_map.end(); ++geomIt )
{
QMap<int, QgsFeature* >::iterator fIt = mFeatures.find( geomIt.key() );
if ( fIt == mFeatures.end() )
{
continue;
}
QgsFeature* currentFeature = fIt.value();
if ( !currentFeature )
{
continue;
}
if ( mSpatialIndex )
{
mSpatialIndex->deleteFeature( *currentFeature );
fIt.value()->setGeometry( geomIt.value() );
mSpatialIndex->insertFeature( *currentFeature );
}
}
return true;
}
else
{
handleException( serverResponse );
return false;
}
}
bool QgsWFSProvider::changeAttributeValues( const QgsChangedAttributesMap &attr_map )
{
//find out typename from uri and strip namespace prefix
QString tname = typeNameFromUrl();
if ( tname.isNull() )
{
return false;
}
const QgsFieldMap& fieldMap = fields();
//create <Transaction> xml
QDomDocument transactionDoc;
QDomElement transactionElem = createTransactionElement( transactionDoc );
transactionDoc.appendChild( transactionElem );
QgsChangedAttributesMap::const_iterator attIt = attr_map.constBegin();
for ( ; attIt != attr_map.constEnd(); ++attIt )
{
//find out wfs server feature id
QMap< int, QString >::const_iterator fidIt = mIdMap.find( attIt.key() );
if ( fidIt == mIdMap.constEnd() )
{
continue;
}
QDomElement updateElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Update" );
updateElem.setAttribute( "typeName", tname );
QgsAttributeMap::const_iterator attMapIt = attIt.value().constBegin();
for ( ; attMapIt != attIt.value().constEnd(); ++attMapIt )
{
QString fieldName;
QgsFieldMap::const_iterator fieldIt = fieldMap.find( attMapIt.key() );
if ( fieldIt == fieldMap.constEnd() )
{
continue;
}
fieldName = fieldIt.value().name();
QDomElement propertyElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Property" );
QDomElement nameElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Name" );
QDomText nameText = transactionDoc.createTextNode( fieldName );
nameElem.appendChild( nameText );
propertyElem.appendChild( nameElem );
QDomElement valueElem = transactionDoc.createElementNS( "http://www.opengis.net/wfs", "Value" );
QDomText valueText = transactionDoc.createTextNode( attMapIt.value().toString() );
valueElem.appendChild( valueText );
propertyElem.appendChild( valueElem );
updateElem.appendChild( propertyElem );
}
//Filter
QDomElement filterElem = transactionDoc.createElementNS( "http://www.opengis.net/ogc", "Filter" );
QDomElement featureIdElem = transactionDoc.createElementNS( "http://www.opengis.net/ogc", "FeatureId" );
featureIdElem.setAttribute( "fid", fidIt.value() );
filterElem.appendChild( featureIdElem );
updateElem.appendChild( filterElem );
transactionElem.appendChild( updateElem );
}
QDomDocument serverResponse;
bool success = sendTransactionDocument( transactionDoc, serverResponse );
if ( !success )
{
return false;
}
if ( transactionSuccess( serverResponse ) )
{
//change attributes in mFeatures
attIt = attr_map.constBegin();
for ( ; attIt != attr_map.constEnd(); ++attIt )
{
QMap<int, QgsFeature*>::iterator fIt = mFeatures.find( attIt.key() );
if ( fIt == mFeatures.end() )
{
continue;
}
QgsFeature* currentFeature = fIt.value();
if ( !currentFeature )
{
continue;
}
QgsAttributeMap::const_iterator attMapIt = attIt.value().constBegin();
for ( ; attMapIt != attIt.value().constEnd(); ++attMapIt )
{
currentFeature->changeAttribute( attMapIt.key(), attMapIt.value() );
}
}
return true;
}
else
{
handleException( serverResponse );
return false;
}
}
int QgsWFSProvider::describeFeatureType( const QString& uri, QString& geometryAttribute, QgsFieldMap& fields )
{
fields.clear();
switch ( mEncoding )
{
case QgsWFSProvider::GET:
return describeFeatureTypeGET( uri, geometryAttribute, fields );
case QgsWFSProvider::FILE:
return describeFeatureTypeFile( uri, geometryAttribute, fields );
}
return 1;
}
int QgsWFSProvider::getFeatureGET( const QString& uri, const QString& geometryAttribute )
{
//the new and faster method with the expat SAX parser
//allows fast searchings with attribute name. Also needed is attribute Index and type infos
QMap<QString, QPair<int, QgsField> > thematicAttributes;
for ( QgsFieldMap::const_iterator it = mFields.begin(); it != mFields.end(); ++it )
{
thematicAttributes.insert( it.value().name(), qMakePair( it.key(), it.value() ) );
}
QgsWFSData dataReader( uri, &mExtent, &mSourceCRS, mFeatures, mIdMap, geometryAttribute, thematicAttributes, &mWKBType );
QObject::connect( &dataReader, SIGNAL( dataProgressAndSteps( int , int ) ), this, SLOT( handleWFSProgressMessage( int, int ) ) );
//also connect to statusChanged signal of qgisapp (if it exists)
QWidget* mainWindow = 0;
QWidgetList topLevelWidgets = qApp->topLevelWidgets();
for ( QWidgetList::iterator it = topLevelWidgets.begin(); it != topLevelWidgets.end(); ++it )
{
if (( *it )->objectName() == "QgisApp" )
{
mainWindow = *it;
break;
}
}
if ( mainWindow )
{
QObject::connect( this, SIGNAL( dataReadProgressMessage( QString ) ), mainWindow, SLOT( showStatusMessage( QString ) ) );
}
if ( dataReader.getWFSData() != 0 )
{
QgsDebugMsg( "getWFSData returned with error" );
return 1;
}
QgsDebugMsg( QString( "feature count after request is: %1" ).arg( mFeatures.size() ) );
QgsDebugMsg( QString( "mExtent after request is: %1" ).arg( mExtent.toString() ) );
for ( QMap<int, QgsFeature*>::iterator it = mFeatures.begin(); it != mFeatures.end(); ++it )
{
QgsDebugMsg( "feature " + QString::number(( *it )->id() ) );
mSpatialIndex->insertFeature( *( it.value() ) );
}
mFeatureCount = mFeatures.size();
return 0;
}
int QgsWFSProvider::getFeatureFILE( const QString& uri, const QString& geometryAttribute )
{
QFile gmlFile( uri );
if ( !gmlFile.open( QIODevice::ReadOnly ) )
{
mValid = false;
return 1;
}
QDomDocument gmlDoc;
QString errorMsg;
int errorLine, errorColumn;
if ( !gmlDoc.setContent( &gmlFile, true, &errorMsg, &errorLine, &errorColumn ) )
{
mValid = false;
return 2;
}
QDomElement featureCollectionElement = gmlDoc.documentElement();
//get and set Extent
if ( getExtentFromGML2( &mExtent, featureCollectionElement ) != 0 )
{
return 3;
}
setCRSFromGML2( featureCollectionElement );
if ( getFeaturesFromGML2( featureCollectionElement, geometryAttribute ) != 0 )
{
return 4;
}
return 0;
}
int QgsWFSProvider::describeFeatureTypeGET( const QString& uri, QString& geometryAttribute, QgsFieldMap& fields )
{
if ( !mNetworkRequestFinished )
{
return 1;
}
mNetworkRequestFinished = false;
QNetworkRequest request( uri );
QNetworkReply* reply = QgsNetworkAccessManager::instance()->get( request );
connect( reply, SIGNAL( finished() ), this, SLOT( networkRequestFinished() ) );
while ( !mNetworkRequestFinished )
{
QCoreApplication::processEvents( QEventLoop::ExcludeUserInputEvents, WFS_THRESHOLD );
}
QByteArray response = reply->readAll();
reply->deleteLater();
QDomDocument describeFeatureDocument;
if ( !describeFeatureDocument.setContent( response, true ) )
{
return 2;
}
if ( readAttributesFromSchema( describeFeatureDocument, geometryAttribute, fields ) != 0 )
{
return 3;
}
return 0;
}
void QgsWFSProvider::networkRequestFinished()
{
mNetworkRequestFinished = true;
}
int QgsWFSProvider::describeFeatureTypeFile( const QString& uri, QString& geometryAttribute, QgsFieldMap& fields )
{
//first look in the schema file
QString noExtension = uri;
noExtension.chop( 3 );
QString schemaUri = noExtension.append( "xsd" );
QFile schemaFile( schemaUri );
if ( schemaFile.open( QIODevice::ReadOnly ) )
{
QDomDocument schemaDoc;
if ( !schemaDoc.setContent( &schemaFile, true ) )
{
return 1; //xml file not readable or not valid
}
if ( readAttributesFromSchema( schemaDoc, geometryAttribute, fields ) != 0 )
{
return 2;
}
return 0;
}
std::list<QString> thematicAttributes;
//if this fails (e.g. no schema file), try to guess the geometry attribute and the names of the thematic attributes from the .gml file
if ( guessAttributesFromFile( uri, geometryAttribute, thematicAttributes ) != 0 )
{
return 1;
}
fields.clear();
int i = 0;
for ( std::list<QString>::const_iterator it = thematicAttributes.begin(); it != thematicAttributes.end(); ++it, ++i )
{
// TODO: is this correct?
fields[i] = QgsField( *it, QVariant::String, "unknown" );
}
return 0;
}
int QgsWFSProvider::readAttributesFromSchema( QDomDocument& schemaDoc, QString& geometryAttribute, QgsFieldMap& fields )
{
//get the <schema> root element
QDomNodeList schemaNodeList = schemaDoc.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "schema" );
if ( schemaNodeList.length() < 1 )
{
return 1;
}
QDomElement schemaElement = schemaNodeList.at( 0 ).toElement();
mWfsNamespace = schemaElement.attribute( "targetNamespace" );
QDomElement complexTypeElement; //the <complexType> element corresponding to the feature type
//find out, on which lines the first <element> or the first <complexType> occur. If <element> occurs first (mapserver), read the type of the relevant <complexType> tag. If <complexType> occurs first (geoserver), search for information about the feature type directly under this first complexType element
int firstElementTagPos = schemaElement.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "element" ).at( 0 ).toElement().columnNumber();
int firstComplexTypeTagPos = schemaElement.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "complexType" ).at( 0 ).toElement().columnNumber();
if ( firstComplexTypeTagPos < firstElementTagPos )
{
//geoserver
complexTypeElement = schemaElement.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "complexType" ).at( 0 ).toElement();
}
else
{
//UMN mapserver
QString complexTypeType;
QDomNodeList typeElementNodeList = schemaElement.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "element" );
QDomElement typeElement = typeElementNodeList.at( 0 ).toElement();
complexTypeType = typeElement.attribute( "type" );
if ( complexTypeType.isEmpty() )
{
return 3;
}
//remove the namespace on complexTypeType
if ( complexTypeType.contains( ":" ) )
{
complexTypeType = complexTypeType.section( ":", 1, 1 );
}
//find <complexType name=complexTypeType
QDomNodeList complexTypeNodeList = schemaElement.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "complexType" );
for ( uint i = 0; i < complexTypeNodeList.length(); ++i )
{
if ( complexTypeNodeList.at( i ).toElement().attribute( "name" ) == complexTypeType )
{
complexTypeElement = complexTypeNodeList.at( i ).toElement();
break;
}
}
}
if ( complexTypeElement.isNull() )
{
return 4;
}
//we have the relevant <complexType> element. Now find out the geometry and the thematic attributes
QDomNodeList attributeNodeList = complexTypeElement.elementsByTagNameNS( "http://www.w3.org/2001/XMLSchema", "element" );
if ( attributeNodeList.size() < 1 )
{
return 5;
}
for ( uint i = 0; i < attributeNodeList.length(); ++i )
{
QDomElement attributeElement = attributeNodeList.at( i ).toElement();
//attribute name
QString name = attributeElement.attribute( "name" );
//attribute type
QString type = attributeElement.attribute( "type" );
//is it a geometry attribute?
//MH 090428: sometimes the <element> tags for geometry attributes have only attribute ref="gml:polygonProperty" and no name
if (( type.startsWith( "gml:" ) && type.endsWith( "PropertyType" ) ) || name.isEmpty() )
{
geometryAttribute = name;
}
else //todo: distinguish between numerical and non-numerical types
{
QVariant::Type attributeType = QVariant::String; //string is default type
if ( type.contains( "double", Qt::CaseInsensitive ) || type.contains( "float", Qt::CaseInsensitive ) )
{
attributeType = QVariant::Double;
}
else if ( type.contains( "int", Qt::CaseInsensitive ) )
{
attributeType = QVariant::Int;
}
else if ( type.contains( "long", Qt::CaseInsensitive ) )
{
attributeType = QVariant::LongLong;
}
fields[fields.size()] = QgsField( name, attributeType, type );
}
}
return 0;
}
int QgsWFSProvider::guessAttributesFromFile( const QString& uri, QString& geometryAttribute, std::list<QString>& thematicAttributes ) const
{
QFile gmlFile( uri );
if ( !gmlFile.open( QIODevice::ReadOnly ) )
{
return 1;
}
QDomDocument gmlDoc;
if ( !gmlDoc.setContent( &gmlFile, true ) )
{
return 2; //xml file not readable or not valid
}
//find gmlCollection element
QDomElement featureCollectionElement = gmlDoc.documentElement();
//get the first feature to guess attributes
QDomNodeList featureList = featureCollectionElement.elementsByTagNameNS( GML_NAMESPACE, "featureMember" );
if ( featureList.size() < 1 )
{
return 3; //we need at least one attribute
}
QDomElement featureElement = featureList.at( 0 ).toElement();
QDomNode attributeNode = featureElement.firstChild().firstChild();
if ( attributeNode.isNull() )
{
return 4;
}
QString attributeText;
QDomElement attributeChildElement;
QString attributeChildLocalName;
while ( !attributeNode.isNull() )//loop over attributes
{
QString attributeNodeName = attributeNode.toElement().localName();
attributeChildElement = attributeNode.firstChild().toElement();
if ( attributeChildElement.isNull() )//no child element means it is a thematic attribute for sure
{
thematicAttributes.push_back( attributeNode.toElement().localName() );
attributeNode = attributeNode.nextSibling();
continue;
}
attributeChildLocalName = attributeChildElement.localName();
if ( attributeChildLocalName == "Point" || attributeChildLocalName == "LineString" ||
attributeChildLocalName == "Polygon" || attributeChildLocalName == "MultiPoint" ||
attributeChildLocalName == "MultiLineString" || attributeChildLocalName == "MultiPolygon" ||
attributeChildLocalName == "Surface" || attributeChildLocalName == "MultiSurface" )
{
geometryAttribute = attributeNode.toElement().localName(); //a geometry attribute
}
else
{
thematicAttributes.push_back( attributeNode.toElement().localName() ); //a thematic attribute
}
attributeNode = attributeNode.nextSibling();
}
return 0;
}
int QgsWFSProvider::getExtentFromGML2( QgsRectangle* extent, const QDomElement& wfsCollectionElement ) const
{
QDomNodeList boundedByList = wfsCollectionElement.elementsByTagNameNS( GML_NAMESPACE, "boundedBy" );
if ( boundedByList.length() < 1 )
{
return 1;
}
QDomElement boundedByElement = boundedByList.at( 0 ).toElement();
QDomNode childNode = boundedByElement.firstChild();
if ( childNode.isNull() )
{
return 2;
}
//support <gml:Box>, <gml:coordinates> and <gml:Envelope>,<gml::lowerCorner>,<gml::upperCorner>. What
//about <gml:Envelope>, <gml:pos>?
QString bboxName = childNode.localName();
if ( bboxName != "Box" )
{
return 3;
}