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[FEATURE]: WFS-T support (experimental). Additionally ported wfs to n… 
…etwork manager (code from Juergen, patch #2892)

git-svn-id: http://svn.osgeo.org/qgis/trunk@13985 c8812cc2-4d05-0410-92ff-de0c093fc19c
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mhugent committed Jul 30, 2010
1 parent 695a700 commit 532cd10
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Showing 6 changed files with 1,208 additions and 341 deletions.
307 changes: 156 additions & 151 deletions src/plugins/wfs/qgswfssourceselect.cpp
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Expand Up @@ -19,20 +19,26 @@
#include "qgswfssourceselect.h"
#include "qgsnewhttpconnection.h"
#include "qgsgenericprojectionselector.h"
#include "qgshttptransaction.h"
#include "qgscontexthelp.h"
#include "qgsproject.h"
#include "qgscoordinatereferencesystem.h"
#include "qgslogger.h"
#include "qgsmapcanvas.h" //for current view extent
#include "qgsnetworkaccessmanager.h"

#include <QDomDocument>
#include <QListWidgetItem>
#include <QMessageBox>
#include <QSettings>
#include <QNetworkRequest>
#include <QNetworkReply>

static const QString WFS_NAMESPACE = "http://www.opengis.net/wfs";

QgsWFSSourceSelect::QgsWFSSourceSelect( QWidget* parent, QgisInterface* iface ): QDialog( parent ), mIface( iface )
QgsWFSSourceSelect::QgsWFSSourceSelect( QWidget* parent, QgisInterface* iface )
: QDialog( parent )
, mIface( iface )
, mCapabilitiesReply( 0 )
{
setupUi( this );
btnAdd = buttonBox->button( QDialogButtonBox::Ok );
Expand Down Expand Up @@ -128,127 +134,165 @@ QString QgsWFSSourceSelect::getPreferredCrs( const QSet<QString>& crsSet ) const
return *( crsSet.constBegin() );
}

int QgsWFSSourceSelect::getCapabilities( const QString& uri, QgsWFSSourceSelect::REQUEST_ENCODING e, std::list<QString>& typenames, std::list< std::list<QString> >& crs, std::list<QString>& titles, std::list<QString>& abstracts )
void QgsWFSSourceSelect::capabilitiesReplyFinished()
{
switch ( e )
if ( mCapabilitiesReply->error() == QNetworkReply::NoError )
{
case QgsWFSSourceSelect::GET:
return getCapabilitiesGET( uri, typenames, crs, titles, abstracts );
case QgsWFSSourceSelect::POST:
return getCapabilitiesPOST( uri, typenames, crs, titles, abstracts );
case QgsWFSSourceSelect::SOAP:
return getCapabilitiesSOAP( uri, typenames, crs, titles, abstracts );
}
return 1;
}

int QgsWFSSourceSelect::getCapabilitiesGET( QString uri, std::list<QString>& typenames, std::list< std::list<QString> >& crs, std::list<QString>& titles, std::list<QString>& abstracts )
{
QString request = uri + "SERVICE=WFS&REQUEST=GetCapabilities&VERSION=1.0.0";
QVariant redirect = mCapabilitiesReply->attribute( QNetworkRequest::RedirectionTargetAttribute );
if ( !redirect.isNull() )
{
QgsDebugMsg( "redirecting to " + redirect.toUrl().toString() );
QNetworkRequest request( redirect.toUrl() );
request.setAttribute( QNetworkRequest::CacheLoadControlAttribute, QNetworkRequest::PreferNetwork );
request.setAttribute( QNetworkRequest::CacheSaveControlAttribute, true );

QByteArray result;
QgsHttpTransaction http( request );
if ( !http.getSynchronously( result ) )
{
QMessageBox::critical( 0, tr( "Error" ),
tr( "Could not download capabilities document: " ) + http.errorString() );
return 1;
}
mCapabilitiesReply->deleteLater();
mCapabilitiesReply = QgsNetworkAccessManager::instance()->get( request );

QDomDocument capabilitiesDocument;
QString capabilitiesDocError;
if ( !capabilitiesDocument.setContent( result, true, &capabilitiesDocError ) )
{
QMessageBox::critical( 0, tr( "Error" ),
tr( "Capabilities document is not valid: " ) + capabilitiesDocError );
return 1;
}
connect( mCapabilitiesReply, SIGNAL( finished() ), this, SLOT( capabilitiesReplyFinished() ) );
connect( mCapabilitiesReply, SIGNAL( downloadProgress( qint64, qint64 ) ), this, SLOT( capabilitiesReplyProgress( qint64, qint64 ) ) );
return;
}

QDomElement doc = capabilitiesDocument.documentElement();
if ( doc.tagName() == "ExceptionReport" )
{
QDomNode ex = doc.firstChild();
QString exc = ex.toElement().attribute("exceptionCode", "Exception");
QDomElement ext = ex.firstChild().toElement();
QMessageBox::critical( 0, tr( "Error" ),
exc + ": " + ext.firstChild().nodeValue() );
return 1;
}
QByteArray buffer = mCapabilitiesReply->readAll();

//get the <FeatureType> elements
QDomNodeList featureTypeList = capabilitiesDocument.elementsByTagNameNS( WFS_NAMESPACE, "FeatureType" );
for ( unsigned int i = 0; i < featureTypeList.length(); ++i )
{
QString tname, title, abstract;
QDomElement featureTypeElem = featureTypeList.at( i ).toElement();
std::list<QString> featureCRSList; //CRS list for this feature
QgsDebugMsg( "parsing capabilities: " + buffer );

//Name
QDomNodeList nameList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "Name" );
if ( nameList.length() > 0 )
{
tname = nameList.at( 0 ).toElement().text();
//strip away namespace prefixes
/* if ( tname.contains( ":" ) )
{
tname = tname.section( ":", 1, 1 );
}*/
}
//Title
QDomNodeList titleList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "Title" );
if ( titleList.length() > 0 )
QString capabilitiesDocError;
QDomDocument capabilitiesDocument;
if ( capabilitiesDocument.setContent( buffer, true, &capabilitiesDocError ) )
{
title = titleList.at( 0 ).toElement().text();
}
//Abstract
QDomNodeList abstractList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "Abstract" );
if ( abstractList.length() > 0 )
{
abstract = abstractList.at( 0 ).toElement().text();
}
QDomElement doc = capabilitiesDocument.documentElement();
if ( doc.tagName() != "ExceptionReport" )
{
std::list<QString> typenames;
std::list< std::list<QString> > crs;
std::list<QString> titles;
std::list<QString> abstracts;

//get the <FeatureType> elements
QDomNodeList featureTypeList = capabilitiesDocument.elementsByTagNameNS( WFS_NAMESPACE, "FeatureType" );
for ( unsigned int i = 0; i < featureTypeList.length(); ++i )
{
QString tname, title, abstract;
QDomElement featureTypeElem = featureTypeList.at( i ).toElement();
std::list<QString> featureCRSList; //CRS list for this feature

//Name
QDomNodeList nameList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "Name" );
if ( nameList.length() > 0 )
{
tname = nameList.at( 0 ).toElement().text();
//strip away namespace prefixes
/* if ( tname.contains( ":" ) )
{
tname = tname.section( ":", 1, 1 );
}*/
}
//Title
QDomNodeList titleList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "Title" );
if ( titleList.length() > 0 )
{
title = titleList.at( 0 ).toElement().text();
}
//Abstract
QDomNodeList abstractList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "Abstract" );
if ( abstractList.length() > 0 )
{
abstract = abstractList.at( 0 ).toElement().text();
}

//DefaultSRS is always the first entry in the feature srs list
QDomNodeList defaultCRSList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "DefaultSRS" );
if ( defaultCRSList.length() > 0 )
{
featureCRSList.push_back( defaultCRSList.at( 0 ).toElement().text() );
}

//OtherSRS
QDomNodeList otherCRSList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "OtherSRS" );
for ( unsigned int i = 0; i < otherCRSList.length(); ++i )
{
featureCRSList.push_back( otherCRSList.at( i ).toElement().text() );
}

//Support <SRS> for compatibility with older versions
QDomNodeList srsList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "SRS" );
for ( unsigned int i = 0; i < srsList.length(); ++i )
{
featureCRSList.push_back( srsList.at( i ).toElement().text() );
}

crs.push_back( featureCRSList );
typenames.push_back( tname );
titles.push_back( title );
abstracts.push_back( abstract );
}

//DefaultSRS is always the first entry in the feature srs list
QDomNodeList defaultCRSList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "DefaultSRS" );
if ( defaultCRSList.length() > 0 )
{
featureCRSList.push_back( defaultCRSList.at( 0 ).toElement().text() );
}
//insert the available CRS into mAvailableCRS
mAvailableCRS.clear();
std::list<QString>::const_iterator typeNameIter;
std::list< std::list<QString> >::const_iterator crsIter;
for ( typeNameIter = typenames.begin(), crsIter = crs.begin(); typeNameIter != typenames.end(); ++typeNameIter, ++crsIter )
{
std::list<QString> currentCRSList;
for ( std::list<QString>::const_iterator it = crsIter->begin(); it != crsIter->end(); ++it )
{
currentCRSList.push_back( *it );
}
mAvailableCRS.insert( std::make_pair( *typeNameIter, currentCRSList ) );
}

//OtherSRS
QDomNodeList otherCRSList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "OtherSRS" );
for ( unsigned int i = 0; i < otherCRSList.length(); ++i )
{
featureCRSList.push_back( otherCRSList.at( i ).toElement().text() );
}
//insert the typenames, titles and abstracts into the tree view
std::list<QString>::const_iterator t_it = titles.begin();
std::list<QString>::const_iterator n_it = typenames.begin();
std::list<QString>::const_iterator a_it = abstracts.begin();
for ( ; t_it != titles.end(); ++t_it, ++n_it, ++a_it )
{
QTreeWidgetItem* newItem = new QTreeWidgetItem();
newItem->setText( 0, *t_it );
newItem->setText( 1, *n_it );
newItem->setText( 2, *a_it );
treeWidget->addTopLevelItem( newItem );
}

//Support <SRS> for compatibility with older versions
QDomNodeList srsList = featureTypeElem.elementsByTagNameNS( WFS_NAMESPACE, "SRS" );
for ( unsigned int i = 0; i < srsList.length(); ++i )
if ( typenames.size() > 0 )
{
btnAdd->setEnabled( true );
treeWidget->setCurrentItem( treeWidget->topLevelItem( 0 ) );
btnChangeSpatialRefSys->setEnabled( true );
}
else
{
QMessageBox::information( 0, tr( "No Layers" ), tr( "capabilities document contained no layers." ) );
btnAdd->setEnabled( false );
}
}
else
{
QDomNode ex = doc.firstChild();
QString exc = ex.toElement().attribute( "exceptionCode", "Exception" );
QDomElement ext = ex.firstChild().toElement();
QMessageBox::critical( 0, tr( "Error" ), exc + ": " + ext.firstChild().nodeValue() );
}
}
else
{
featureCRSList.push_back( srsList.at( i ).toElement().text() );
QMessageBox::critical( 0, tr( "Capabilities document is not valid" ), capabilitiesDocError );
}

crs.push_back( featureCRSList );
typenames.push_back( tname );
titles.push_back( title );
abstracts.push_back( abstract );
}
else
{
QMessageBox::critical( 0, tr( "GetCapabilities Error" ), mCapabilitiesReply->errorString() );
}


//print out result for a test
QgsDebugMsg( result );

return 0;
}

int QgsWFSSourceSelect::getCapabilitiesPOST( const QString& uri, std::list<QString>& typenames, std::list< std::list<QString> >& crs, std::list<QString>& titles, std::list<QString>& abstracts )
{
return 1; //soon...
btnConnect->setEnabled( true );
mCapabilitiesReply->deleteLater();
mCapabilitiesReply = 0;
}

int QgsWFSSourceSelect::getCapabilitiesSOAP( const QString& uri, std::list<QString>& typenames, std::list< std::list<QString> >& crs, std::list<QString>& titles, std::list<QString>& abstracts )
void QgsWFSSourceSelect::capabilitiesReplyProgress( qint64, qint64 )
{
return 1; //soon...
}

void QgsWFSSourceSelect::addEntryToServerList()
Expand Down Expand Up @@ -296,11 +340,6 @@ void QgsWFSSourceSelect::connectToServer()
QgsDebugMsg( QString( "url is: %1" ).arg( mUri ) );

//make a GetCapabilities request
std::list<QString> typenames;
std::list< std::list<QString> > crsList;
std::list<QString> titles;
std::list<QString> abstracts;

//modify mUri to add '?' or '&' at the end if it is not already there
if ( !( mUri.contains( "?" ) ) )
{
Expand All @@ -311,51 +350,17 @@ void QgsWFSSourceSelect::connectToServer()
mUri.append( "&" );
}

if ( getCapabilities( mUri, QgsWFSSourceSelect::GET, typenames, crsList, titles, abstracts ) != 0 )
{
QgsDebugMsg( "error during GetCapabilities request" );
}

//insert the available CRS into mAvailableCRS
mAvailableCRS.clear();
std::list<QString>::const_iterator typeNameIter;
std::list< std::list<QString> >::const_iterator crsIter;
for ( typeNameIter = typenames.begin(), crsIter = crsList.begin(); typeNameIter != typenames.end(); ++typeNameIter, ++crsIter )
{
std::list<QString> currentCRSList;
for ( std::list<QString>::const_iterator it = crsIter->begin(); it != crsIter->end(); ++it )
{
currentCRSList.push_back( *it );
}
mAvailableCRS.insert( std::make_pair( *typeNameIter, currentCRSList ) );
}

//insert the typenames, titles and abstracts into the tree view
btnConnect->setEnabled( false );
treeWidget->clear();
std::list<QString>::const_iterator t_it = titles.begin();
std::list<QString>::const_iterator n_it = typenames.begin();
std::list<QString>::const_iterator a_it = abstracts.begin();
for ( ; t_it != titles.end(); ++t_it, ++n_it, ++a_it )
{
QTreeWidgetItem* newItem = new QTreeWidgetItem();
newItem->setText( 0, *t_it );
newItem->setText( 1, *n_it );
newItem->setText( 2, *a_it );
treeWidget->addTopLevelItem( newItem );
}

if ( typenames.size() > 0 )
{
btnAdd->setEnabled( true );
treeWidget->setCurrentItem( treeWidget->topLevelItem( 0 ) );
btnChangeSpatialRefSys->setEnabled( true );
}
else
{
btnAdd->setEnabled( false );
}
QNetworkRequest request( mUri + "SERVICE=WFS&REQUEST=GetCapabilities&VERSION=1.0.0" );
request.setAttribute( QNetworkRequest::CacheSaveControlAttribute, true );
mCapabilitiesReply = QgsNetworkAccessManager::instance()->get( request );
connect( mCapabilitiesReply, SIGNAL( finished() ), this, SLOT( capabilitiesReplyFinished() ) );
connect( mCapabilitiesReply, SIGNAL( downloadProgress( qint64, qint64 ) ), this, SLOT( capabilitiesReplyProgress( qint64, qint64 ) ) );
}


void QgsWFSSourceSelect::addLayer()
{
//get selected entry in lstWidget
Expand Down

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