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qgswfsshareddata.cpp
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qgswfsshareddata.cpp
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/***************************************************************************
qgswfsshareddata.cpp
---------------------
begin : March 2016
copyright : (C) 2016 by Even Rouault
email : even.rouault at spatialys.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 <math.h> // M_PI
#include "qgswfsconstants.h"
#include "qgswfsshareddata.h"
#include "qgswfsutils.h"
#include "qgsogcutils.h"
#include "qgsexpression.h"
#include "qgsmessagelog.h"
#include "qgsspatialindex.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorfilewriter.h"
#include "qgsproviderregistry.h"
#include "qgsslconnect.h"
#include <cpl_vsi.h>
#include <cpl_conv.h>
#include <ogr_api.h>
#include <sqlite3.h>
QgsWFSSharedData::QgsWFSSharedData( const QString& uri )
: mURI( uri )
, mSourceCRS( 0 )
, mCacheDataProvider( nullptr )
, mMaxFeatures( 0 )
, mMaxFeaturesWasSetFromDefaultForPaging( false )
, mRequestLimit( 0 )
, mHideProgressDialog( mURI.hideDownloadProgressDialog() )
, mDistinctSelect( false )
, mHasWarnedAboutMissingFeatureId( false )
, mGetFeatureEPSGDotHonoursEPSGOrder( false )
, mDownloader( nullptr )
, mDownloadFinished( false )
, mGenCounter( 0 )
, mFeatureCount( 0 )
, mFeatureCountExact( false )
, mGetFeatureHitsIssued( false )
, mTotalFeaturesAttemptedToBeCached( 0 )
, mTryFetchingOneFeature( false )
{
// Needed because used by a signal
qRegisterMetaType< QVector<QgsWFSFeatureGmlIdPair> >( "QVector<QgsWFSFeatureGmlIdPair>" );
}
QgsWFSSharedData::~QgsWFSSharedData()
{
QgsDebugMsg( QString( "~QgsWFSSharedData()" ) );
invalidateCache();
}
QString QgsWFSSharedData::srsName() const
{
QString srsName;
if ( !mSourceCRS.authid().isEmpty() )
{
if ( mWFSVersion.startsWith( "1.0" ) ||
!mSourceCRS.authid().startsWith( "EPSG:" ) ||
// For servers like Geomedia that advertize EPSG:XXXX in capabilities even in WFS 1.1 or 2.0
mCaps.useEPSGColumnFormat )
{
srsName = mSourceCRS.authid();
}
else
{
QStringList list = mSourceCRS.authid().split( ':' );
srsName = QString( "urn:ogc:def:crs:EPSG::%1" ).arg( list.last() );
}
}
return srsName;
}
bool QgsWFSSharedData::computeFilter( QString& errorMsg )
{
errorMsg.clear();
mWFSFilter.clear();
mSortBy.clear();
QgsOgcUtils::GMLVersion gmlVersion;
QgsOgcUtils::FilterVersion filterVersion;
bool honourAxisOrientation = false;
if ( mWFSVersion.startsWith( "1.0" ) )
{
gmlVersion = QgsOgcUtils::GML_2_1_2;
filterVersion = QgsOgcUtils::FILTER_OGC_1_0;
}
else if ( mWFSVersion.startsWith( "1.1" ) )
{
honourAxisOrientation = !mURI.ignoreAxisOrientation();
gmlVersion = QgsOgcUtils::GML_3_1_0;
filterVersion = QgsOgcUtils::FILTER_OGC_1_1;
}
else
{
honourAxisOrientation = !mURI.ignoreAxisOrientation();
gmlVersion = QgsOgcUtils::GML_3_2_1;
filterVersion = QgsOgcUtils::FILTER_FES_2_0;
}
if ( !mURI.sql().isEmpty() )
{
QgsSQLStatement sql( mURI.sql() );
const QgsSQLStatement::NodeSelect* select = dynamic_cast<const QgsSQLStatement::NodeSelect*>( sql.rootNode() );
if ( !select )
{
// Makes Coverity happy, but cannot happen in practice
QgsDebugMsg( "should not happen" );
return false;
}
QList<QgsSQLStatement::NodeColumnSorted*> orderBy = select->orderBy();
Q_FOREACH ( QgsSQLStatement::NodeColumnSorted* columnSorted, orderBy )
{
if ( !mSortBy.isEmpty() )
mSortBy += ",";
mSortBy += columnSorted->column()->name();
if ( !columnSorted->ascending() )
{
if ( mWFSVersion.startsWith( "2.0" ) )
mSortBy += " DESC";
else
mSortBy += " D";
}
}
QDomDocument filterDoc;
QDomElement filterElem = QgsOgcUtils::SQLStatementToOgcFilter(
sql, filterDoc, gmlVersion, filterVersion, mLayerPropertiesList,
honourAxisOrientation, mURI.invertAxisOrientation(),
mCaps.mapUnprefixedTypenameToPrefixedTypename,
&errorMsg );
if ( !errorMsg.isEmpty() )
{
errorMsg = tr( "SQL statement to OGC Filter error: " ) + errorMsg;
return false;
}
if ( !filterElem.isNull() )
{
filterDoc.appendChild( filterElem );
mWFSFilter = filterDoc.toString();
}
}
else
{
QString filter( mURI.filter() );
if ( !filter.isEmpty() )
{
//test if filterString is already an OGC filter xml
QDomDocument filterDoc;
if ( filterDoc.setContent( filter ) )
{
mWFSFilter = filter;
}
else
{
//if not, if must be a QGIS expression
QgsExpression filterExpression( filter );
QDomElement filterElem = QgsOgcUtils::expressionToOgcFilter(
filterExpression, filterDoc, gmlVersion, filterVersion, mGeometryAttribute,
srsName(), honourAxisOrientation, mURI.invertAxisOrientation(),
&errorMsg );
if ( !errorMsg.isEmpty() )
{
errorMsg = tr( "Expression to OGC Filter error: " ) + errorMsg;
return false;
}
if ( !filterElem.isNull() )
{
filterDoc.appendChild( filterElem );
mWFSFilter = filterDoc.toString();
}
}
}
}
return true;
}
// We have an issue with GDAL 1.10 and older that is using spatialite_init() which is
// incompatible with how the QGIS spatialite provider works.
// The symptom of the issue is the error message
// 'Unable to Initialize SpatiaLite Metadata: no such function: InitSpatialMetadata'
// So in that case we must use only QGIS functions to avoid the conflict
// The difference is that in the QGIS way we have to create the template database
// on disk, which is a slightly bit slower. But due to later caching, this is
// not so a big deal.
#if GDAL_VERSION_MAJOR >= 2 || GDAL_VERSION_MINOR >= 11
#define USE_OGR_FOR_DB_CREATION
#endif
static QString quotedIdentifier( QString id )
{
id.replace( '\"', "\"\"" );
return id.prepend( '\"' ).append( '\"' );
}
bool QgsWFSSharedData::createCache()
{
Q_ASSERT( mCacheDbname.isEmpty() );
static int tmpCounter = 0;
++tmpCounter;
mCacheDbname = QDir( QgsWFSUtils::acquireCacheDirectory() ).filePath( QString( "wfs_cache_%1.sqlite" ).arg( tmpCounter ) );
QgsFields cacheFields;
Q_FOREACH ( const QgsField& field, mFields )
{
QVariant::Type type = field.type();
// Map DateTime to int64 milliseconds from epoch
if ( type == QVariant::DateTime )
{
// Note: this is just a wish. If GDAL < 2, QgsVectorFileWriter will actually map
// it to a String
type = QVariant::LongLong;
}
cacheFields.append( QgsField( field.name(), type, field.typeName() ) );
}
// Add some field for our internal use
cacheFields.append( QgsField( QgsWFSConstants::FIELD_GEN_COUNTER, QVariant::Int, "int" ) );
cacheFields.append( QgsField( QgsWFSConstants::FIELD_GMLID, QVariant::String, "string" ) );
cacheFields.append( QgsField( QgsWFSConstants::FIELD_HEXWKB_GEOM, QVariant::String, "string" ) );
if ( mDistinctSelect )
cacheFields.append( QgsField( QgsWFSConstants::FIELD_MD5, QVariant::String, "string" ) );
bool ogrWaySuccessful = false;
QString fidName( "__ogc_fid" );
QString geometryFieldname( "__spatialite_geometry" );
#ifdef USE_OGR_FOR_DB_CREATION
// Only GDAL >= 2.0 can use an alternate geometry or FID field name
// but QgsVectorFileWriter will refuse anyway to create a ogc_fid, so we will
// do it manually
bool useReservedNames = cacheFields.fieldNameIndex( "ogc_fid" ) >= 0;
#if GDAL_VERSION_MAJOR < 2
if ( cacheFields.fieldNameIndex( "geometry" ) >= 0 )
useReservedNames = true;
#endif
if ( !useReservedNames )
{
#if GDAL_VERSION_MAJOR < 2
fidName = "ogc_fid";
geometryFieldname = "GEOMETRY";
#endif
// Creating a spatialite database can be quite slow on some file systems
// so we create a GDAL in-memory file, and then copy it on
// the file system.
QString vsimemFilename;
QStringList datasourceOptions;
QStringList layerOptions;
datasourceOptions.push_back( "INIT_WITH_EPSG=NO" );
layerOptions.push_back( "LAUNDER=NO" ); // to get exact matches for field names, especially regarding case
#if GDAL_VERSION_MAJOR >= 2
layerOptions.push_back( "FID=__ogc_fid" );
layerOptions.push_back( "GEOMETRY_NAME=__spatialite_geometry" );
#endif
vsimemFilename.sprintf( "/vsimem/qgis_wfs_cache_template_%p/features.sqlite", this );
mCacheTablename = CPLGetBasename( vsimemFilename.toStdString().c_str() );
VSIUnlink( vsimemFilename.toStdString().c_str() );
QgsVectorFileWriter* writer = new QgsVectorFileWriter( vsimemFilename, "",
cacheFields, QGis::WKBPolygon, nullptr, "SpatiaLite", datasourceOptions, layerOptions );
if ( writer->hasError() == QgsVectorFileWriter::NoError )
{
delete writer;
// Copy the temporary database back to disk
vsi_l_offset nLength = 0;
GByte* pabyData = VSIGetMemFileBuffer( vsimemFilename.toStdString().c_str(), &nLength, TRUE );
VSILFILE* fp = VSIFOpenL( mCacheDbname.toStdString().c_str(), "wb " );
if ( fp )
{
VSIFWriteL( pabyData, 1, nLength, fp );
VSIFCloseL( fp );
CPLFree( pabyData );
}
else
{
CPLFree( pabyData );
QgsMessageLog::logMessage( tr( "Cannot create temporary SpatiaLite cache" ), tr( "WFS" ) );
return false;
}
ogrWaySuccessful = true;
}
else
{
// Be tolerant on failures. Some (Windows) GDAL >= 1.11 builds may
// not define SPATIALITE_412_OR_LATER, and thus the call to
// spatialite_init() may cause failures, which will require using the
// slower method
delete writer;
VSIUnlink( vsimemFilename.toStdString().c_str() );
}
}
#endif
if ( !ogrWaySuccessful )
{
static QMutex mutexDBnameCreation;
static QByteArray cachedDBTemplate;
QMutexLocker mutexDBnameCreationHolder( &mutexDBnameCreation );
if ( cachedDBTemplate.size() == 0 )
{
// Create a template Spatialite DB
QTemporaryFile tempFile;
tempFile.open();
tempFile.setAutoRemove( false );
tempFile.close();
QString spatialite_lib = QgsProviderRegistry::instance()->library( "spatialite" );
QLibrary* myLib = new QLibrary( spatialite_lib );
bool loaded = myLib->load();
bool created = false;
if ( loaded )
{
QgsDebugMsg( "spatialite provider loaded" );
typedef bool ( *createDbProc )( const QString&, QString& );
createDbProc createDbPtr = ( createDbProc ) cast_to_fptr( myLib->resolve( "createDb" ) );
if ( createDbPtr )
{
QString errCause;
created = createDbPtr( tempFile.fileName(), errCause );
}
}
delete myLib;
if ( !created )
{
QgsMessageLog::logMessage( tr( "Cannot create temporary SpatiaLite cache" ), tr( "WFS" ) );
return false;
}
// Ingest it in a buffer
QFile file( tempFile.fileName() );
if ( file.open( QIODevice::ReadOnly ) )
cachedDBTemplate = file.readAll();
file.close();
QFile::remove( tempFile.fileName() );
}
// Copy the in-memory template Spatialite DB into the target DB
QFile dbFile( mCacheDbname );
if ( !dbFile.open( QIODevice::WriteOnly ) )
{
QgsMessageLog::logMessage( tr( "Cannot create temporary SpatiaLite cache" ), tr( "WFS" ) );
return false;
}
if ( dbFile.write( cachedDBTemplate ) < 0 )
{
QgsMessageLog::logMessage( tr( "Cannot create temporary SpatiaLite cache" ), tr( "WFS" ) );
return false;
}
}
sqlite3 *db;
bool ret = true;
int rc = QgsSLConnect::sqlite3_open( mCacheDbname.toUtf8(), &db );
if ( rc == SQLITE_OK )
{
QString sql;
( void )sqlite3_exec( db, "PRAGMA synchronous=OFF", nullptr, nullptr, nullptr );
// WAL is needed to avoid reader to block writers
( void )sqlite3_exec( db, "PRAGMA journal_mode=WAL", nullptr, nullptr, nullptr );
( void )sqlite3_exec( db, "BEGIN", nullptr, nullptr, nullptr );
if ( !ogrWaySuccessful )
{
mCacheTablename = "features";
sql = QString( "CREATE TABLE %1 (%2 INTEGER PRIMARY KEY" ).arg( mCacheTablename ).arg( fidName );
Q_FOREACH ( QgsField field, cacheFields )
{
QString type( "VARCHAR" );
if ( field.type() == QVariant::Int )
type = "INTEGER";
else if ( field.type() == QVariant::LongLong )
type = "BIGINT";
else if ( field.type() == QVariant::Double )
type = "REAL";
sql += QString( ", %1 %2" ).arg( quotedIdentifier( field.name() ), type );
}
sql += ")";
rc = sqlite3_exec( db, sql.toUtf8(), nullptr, nullptr, nullptr );
if ( rc != SQLITE_OK )
{
QgsDebugMsg( QString( "%1 failed" ).arg( sql ) );
ret = false;
}
sql = QString( "SELECT AddGeometryColumn('%1','%2',0,'POLYGON',2)" ).arg( mCacheTablename, geometryFieldname );
rc = sqlite3_exec( db, sql.toUtf8(), nullptr, nullptr, nullptr );
if ( rc != SQLITE_OK )
{
QgsDebugMsg( QString( "%1 failed" ).arg( sql ) );
ret = false;
}
sql = QString( "SELECT CreateSpatialIndex('%1','%2')" ).arg( mCacheTablename, geometryFieldname );
rc = sqlite3_exec( db, sql.toUtf8(), nullptr, nullptr, nullptr );
if ( rc != SQLITE_OK )
{
QgsDebugMsg( QString( "%1 failed" ).arg( sql ) );
ret = false;
}
}
// We need an index on the gmlid, since we will check for duplicates, particularly
// useful in the case we do overlapping BBOX requests
sql = QString( "CREATE INDEX idx_%2 ON %1(%2)" ).arg( mCacheTablename ).arg( QgsWFSConstants::FIELD_GMLID );
rc = sqlite3_exec( db, sql.toUtf8(), nullptr, nullptr, nullptr );
if ( rc != SQLITE_OK )
{
QgsDebugMsg( QString( "%1 failed" ).arg( sql ) );
ret = false;
}
if ( mDistinctSelect )
{
sql = QString( "CREATE INDEX idx_%2 ON %1(%2)" ).arg( mCacheTablename ).arg( QgsWFSConstants::FIELD_MD5 );
rc = sqlite3_exec( db, sql.toUtf8(), nullptr, nullptr, nullptr );
if ( rc != SQLITE_OK )
{
QgsDebugMsg( QString( "%1 failed" ).arg( sql ) );
ret = false;
}
}
( void )sqlite3_exec( db, "COMMIT", nullptr, nullptr, nullptr );
QgsSLConnect::sqlite3_close( db );
}
else
{
ret = false;
}
if ( !ret )
{
QgsMessageLog::logMessage( tr( "Cannot create temporary SpatiaLite cache" ), tr( "WFS" ) );
return false;
}
// Some pragmas to speed-up writing. We don't need much integrity guarantee
// regarding crashes, since this is a temporary DB
QgsDataSourceURI dsURI;
dsURI.setDatabase( mCacheDbname );
dsURI.setDataSource( "", mCacheTablename, geometryFieldname, "", fidName );
QStringList pragmas;
pragmas << "synchronous=OFF";
pragmas << "journal_mode=WAL"; // WAL is needed to avoid reader to block writers
dsURI.setParam( "pragma", pragmas );
mCacheDataProvider = ( QgsVectorDataProvider* )( QgsProviderRegistry::instance()->provider(
"spatialite", dsURI.uri() ) );
if ( mCacheDataProvider && !mCacheDataProvider->isValid() )
{
delete mCacheDataProvider;
mCacheDataProvider = nullptr;
}
if ( !mCacheDataProvider )
{
QgsMessageLog::logMessage( tr( "Cannot connect to temporary SpatiaLite cache" ), tr( "WFS" ) );
return false;
}
return true;
}
int QgsWFSSharedData::registerToCache( QgsWFSFeatureIterator *iterator, int limit, const QgsRectangle &rect )
{
// This locks prevents 2 readers to register at the same time (and particularly
// destroy the current mDownloader at the same time)
// Why not using the mMutex lock ? Because we must unlock it temporarily later
// in the function, when destroying the current downloader, so we must have
// another lock to prevent another reader to go into the critical section.
QMutexLocker lockerMyself( &mMutexRegisterToCache );
// This lock prevents a reader and the downloader/writer to manipulate tmpCounter
// together
QMutexLocker locker( &mMutex );
if ( mCacheDbname.isEmpty() )
{
if ( !createCache() )
{
return -1;
}
}
// In case the request has a spatial filter, which is not the one currently
// being downloaded, check if we have already downloaded an area of interest that includes it
// before deciding to restart a new download with the provided area of interest.
// But don't abort a on going download without a BBOX (Offline editing use case
// when "Only request features overlapping the view extent" : the offline editor
// want to request all features whereas the map renderer only the view)
bool newDownloadNeeded = false;
if ( !rect.isEmpty() && mRect != rect && !( mDownloader && mRect.isEmpty() ) )
{
QList<QgsFeatureId> intersectingRequests = mCachedRegions.intersects( rect );
newDownloadNeeded = true;
Q_FOREACH ( QgsFeatureId id, intersectingRequests )
{
Q_ASSERT( id >= 0 && id < mRegions.size() ); // by construction, but doesn't hurt to be checked
// If the requested bbox is inside an already cached rect that didn't
// hit the download limit, then we can reuse the cached features without
// issuing a new request.
if ( mRegions[id].geometry()->boundingBox().contains( rect ) &&
!mRegions[id].attributes().value( 0 ).toBool() )
{
QgsDebugMsg( "Cached features already cover this area of interest" );
newDownloadNeeded = false;
break;
}
// On the other hand, if the requested bbox is inside an already cached rect,
// that hit the download limit, our larger bbox will hit it too, so no need
// to re-issue a new request either.
if ( rect.contains( mRegions[id].geometry()->boundingBox() ) &&
mRegions[id].attributes().value( 0 ).toBool() )
{
QgsDebugMsg( "Current request is larger than a smaller request that hit the download limit, so no server download needed." );
newDownloadNeeded = false;
break;
}
}
}
// If there's a ongoing download with a BBOX and we request a new download
// without it, then we need a new download.
else if ( rect.isEmpty() && mDownloader && !mRect.isEmpty() )
{
newDownloadNeeded = true;
}
// If there's a ongoing download with a limitation, and the new download is
// unlimited, we need a new download.
else if ( !( mWFSVersion.startsWith( QLatin1String( "1.0" ) ) ) && limit <= 0 && mRequestLimit > 0 )
{
newDownloadNeeded = true;
}
if ( newDownloadNeeded || !mDownloader )
{
mRect = rect;
mRequestLimit = ( limit > 0 && !( mWFSVersion.startsWith( QLatin1String( "1.0" ) ) ) ) ? limit : 0;
// to prevent deadlock when waiting the end of the downloader thread that will try to take the mutex in serializeFeatures()
mMutex.unlock();
delete mDownloader;
mMutex.lock();
mDownloadFinished = false;
mComputedExtent = QgsRectangle();
mDownloader = new QgsWFSThreadedFeatureDownloader( this );
mDownloader->startAndWait();
}
if ( mDownloadFinished )
return -1;
// Under the mutex to ensure that we will not miss features
iterator->connectSignals( mDownloader->downloader() );
return mGenCounter ++;
}
int QgsWFSSharedData::getUpdatedCounter()
{
QMutexLocker locker( &mMutex );
if ( mDownloadFinished )
return mGenCounter;
return mGenCounter ++;
}
QSet<QString> QgsWFSSharedData::getExistingCachedGmlIds( const QVector<QgsWFSFeatureGmlIdPair>& featureList )
{
QString expr;
bool first = true;
QSet<QString> setExistingGmlIds;
const QgsFields & dataProviderFields = mCacheDataProvider->fields();
const int gmlidIdx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_GMLID );
// To avoid excessive memory consumption in expression building, do not
// query more than 1000 ids at a time.
for ( int i = 0; i < featureList.size(); i ++ )
{
if ( !first )
expr += ",";
else
{
expr = QgsWFSConstants::FIELD_GMLID + " IN (";
first = false;
}
expr += "'";
expr += featureList[i].second;
expr += "'";
if (( i > 0 && ( i % 1000 ) == 0 ) || i + 1 == featureList.size() )
{
expr += ")";
QgsFeatureRequest request;
request.setFilterExpression( expr );
QgsAttributeList attList;
attList.append( gmlidIdx );
request.setSubsetOfAttributes( attList );
QgsFeatureIterator iterGmlIds( mCacheDataProvider->getFeatures( request ) );
QgsFeature gmlidFeature;
while ( iterGmlIds.nextFeature( gmlidFeature ) )
{
const QVariant &v = gmlidFeature.attributes().value( gmlidIdx );
setExistingGmlIds.insert( v.toString() );
}
first = true;
}
}
return setExistingGmlIds;
}
QSet<QString> QgsWFSSharedData::getExistingCachedMD5( const QVector<QgsWFSFeatureGmlIdPair>& featureList )
{
QString expr;
bool first = true;
QSet<QString> setExistingMD5;
const QgsFields & dataProviderFields = mCacheDataProvider->fields();
const int md5Idx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_MD5 );
// To avoid excessive memory consumption in expression building, do not
// query more than 1000 ids at a time.
for ( int i = 0; i < featureList.size(); i ++ )
{
if ( !first )
expr += ",";
else
{
expr = QgsWFSConstants::FIELD_MD5 + " IN (";
first = false;
}
expr += "'";
expr += QgsWFSUtils::getMD5( featureList[i].first );
expr += "'";
if (( i > 0 && ( i % 1000 ) == 0 ) || i + 1 == featureList.size() )
{
expr += ")";
QgsFeatureRequest request;
request.setFilterExpression( expr );
QgsAttributeList attList;
attList.append( md5Idx );
request.setSubsetOfAttributes( attList );
QgsFeatureIterator iterMD5s( mCacheDataProvider->getFeatures( request ) );
QgsFeature gmlidFeature;
while ( iterMD5s.nextFeature( gmlidFeature ) )
{
const QVariant &v = gmlidFeature.attributes().value( md5Idx );
setExistingMD5.insert( v.toString() );
}
first = true;
}
}
return setExistingMD5;
}
// Used by WFS-T
QString QgsWFSSharedData::findGmlId( QgsFeatureId fid )
{
if ( !mCacheDataProvider )
return QString();
QgsFeatureRequest request;
request.setFilterFid( fid );
const QgsFields & dataProviderFields = mCacheDataProvider->fields();
int gmlidIdx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_GMLID );
QgsAttributeList attList;
attList.append( gmlidIdx );
request.setSubsetOfAttributes( attList );
QgsFeatureIterator iterGmlIds( mCacheDataProvider->getFeatures( request ) );
QgsFeature gmlidFeature;
QSet<QString> setExistingGmlIds;
while ( iterGmlIds.nextFeature( gmlidFeature ) )
{
const QVariant &v = gmlidFeature.attributes().value( gmlidIdx );
return v.toString();
}
return QString();
}
// Used by WFS-T
bool QgsWFSSharedData::deleteFeatures( const QgsFeatureIds& fidlist )
{
if ( !mCacheDataProvider )
return false;
{
QMutexLocker locker( &mMutex );
mFeatureCount -= fidlist.size();
}
return mCacheDataProvider->deleteFeatures( fidlist );
}
// Used by WFS-T
bool QgsWFSSharedData::changeGeometryValues( const QgsGeometryMap &geometry_map )
{
if ( !mCacheDataProvider )
return false;
// We need to replace the geometry by its bounding box and issue a attribute
// values change with the real geometry serialized as hexwkb.
int idx = mCacheDataProvider->fields().indexFromName( QgsWFSConstants::FIELD_HEXWKB_GEOM );
Q_ASSERT( idx >= 0 );
QgsGeometryMap newGeometryMap;
QgsChangedAttributesMap newChangedAttrMap;
for ( QgsGeometryMap::const_iterator iter = geometry_map.constBegin(); iter != geometry_map.constEnd(); ++iter )
{
const unsigned char *geom = iter->asWkb();
int geomSize = iter->wkbSize();
if ( geomSize )
{
QgsAttributeMap newAttrMap;
QByteArray array(( const char* )geom, geomSize );
newAttrMap[idx] = QString( array.toHex().data() );
newChangedAttrMap[ iter.key()] = newAttrMap;
QgsGeometry* polyBoudingBox = QgsGeometry::fromRect( iter.value().boundingBox() );
newGeometryMap[ iter.key()] = *polyBoudingBox;
delete polyBoudingBox;
}
else
{
QgsAttributeMap newAttrMap;
newAttrMap[idx] = QString();
newChangedAttrMap[ iter.key()] = newAttrMap;
newGeometryMap[ iter.key()] = QgsGeometry();
}
}
return mCacheDataProvider->changeGeometryValues( newGeometryMap ) &&
mCacheDataProvider->changeAttributeValues( newChangedAttrMap );
}
// Used by WFS-T
bool QgsWFSSharedData::changeAttributeValues( const QgsChangedAttributesMap &attr_map )
{
if ( !mCacheDataProvider )
return false;
const QgsFields & dataProviderFields = mCacheDataProvider->fields();
QgsChangedAttributesMap newMap;
for ( QgsChangedAttributesMap::const_iterator iter = attr_map.begin(); iter != attr_map.end(); ++iter )
{
QgsFeatureId fid = iter.key();
const QgsAttributeMap &attrs = iter.value();
if ( attrs.isEmpty() )
continue;
QgsAttributeMap newAttrMap;
for ( QgsAttributeMap::const_iterator siter = attrs.begin(); siter != attrs.end(); ++siter )
{
int idx = dataProviderFields.indexFromName( mFields.at( siter.key() ).name() );
Q_ASSERT( idx >= 0 );
if ( siter.value().type() == QVariant::DateTime && !siter.value().isNull() )
newAttrMap[idx] = QVariant( siter.value().toDateTime().toMSecsSinceEpoch() );
else
newAttrMap[idx] = siter.value();
}
newMap[fid] = newAttrMap;
}
return mCacheDataProvider->changeAttributeValues( newMap );
}
void QgsWFSSharedData::serializeFeatures( QVector<QgsWFSFeatureGmlIdPair>& featureList )
{
QgsDebugMsg( QString( "begin %1" ).arg( featureList.size() ) );
int genCounter;
{
QMutexLocker locker( &mMutex );
if ( mCacheDbname.isEmpty() )
{
if ( !createCache() )
{
return;
}
}
if ( !mCacheDataProvider )
{
return;
}
genCounter = mGenCounter;
}
QgsFeatureList featureListToCache;
const QgsFields & dataProviderFields = mCacheDataProvider->fields();
int gmlidIdx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_GMLID );
Q_ASSERT( gmlidIdx >= 0 );
int genCounterIdx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_GEN_COUNTER );
Q_ASSERT( genCounterIdx >= 0 );
int hexwkbGeomIdx = dataProviderFields.indexFromName( QgsWFSConstants::FIELD_HEXWKB_GEOM );
Q_ASSERT( hexwkbGeomIdx >= 0 );
int md5Idx = ( mDistinctSelect ) ? dataProviderFields.indexFromName( QgsWFSConstants::FIELD_MD5 ) : -1;
QSet<QString> existingGmlIds;
QSet<QString> existingMD5s;
if ( mDistinctSelect )
existingMD5s = getExistingCachedMD5( featureList );
else
existingGmlIds = getExistingCachedGmlIds( featureList );
QVector<QgsWFSFeatureGmlIdPair> updatedFeatureList;
QgsRectangle localComputedExtent( mComputedExtent );
Q_FOREACH ( QgsWFSFeatureGmlIdPair featPair, featureList )
{
const QgsFeature& gmlFeature = featPair.first;
const QString& gmlId = featPair.second;
QString md5;
if ( mDistinctSelect )
{
md5 = QgsWFSUtils::getMD5( gmlFeature );
if ( existingMD5s.contains( md5 ) )
continue;
existingMD5s.insert( md5 );
}
else
{
if ( gmlId.isEmpty() )
{
// Shouldn't happen on sane datasets.
}
else if ( existingGmlIds.contains( gmlId ) )
{
if ( mRect.isEmpty() )
{
QgsDebugMsg( QString( "duplicate gmlId %1" ).arg( gmlId ) );
}
continue;
}
else
{
existingGmlIds.insert( gmlId );
}
}
updatedFeatureList.push_back( featPair );
QgsFeature cachedFeature;
cachedFeature.initAttributes( dataProviderFields.size() );
//copy the geometry
const QgsGeometry* geometry = gmlFeature.constGeometry();
if ( !mGeometryAttribute.isEmpty() && geometry )
{
const unsigned char *geom = geometry->asWkb();
int geomSize = geometry->wkbSize();
QByteArray array(( const char* )geom, geomSize );
cachedFeature.setAttribute( hexwkbGeomIdx, QVariant( QString( array.toHex().data() ) ) );
QgsRectangle bBox( geometry->boundingBox() );
if ( localComputedExtent.isNull() )
localComputedExtent = bBox;
else
localComputedExtent.combineExtentWith( bBox );
QgsGeometry* polyBoundingBox = QgsGeometry::fromRect( bBox );
cachedFeature.setGeometry( polyBoundingBox );
}
else
{
cachedFeature.setAttribute( hexwkbGeomIdx, QVariant( QString() ) );
}
//and the attributes
for ( int i = 0; i < mFields.size(); i++ )
{
int idx = dataProviderFields.indexFromName( mFields.at( i ).name() );
if ( idx >= 0 )
{
const QVariant &v = gmlFeature.attributes().value( i );
if ( v.type() == QVariant::DateTime && !v.isNull() )
cachedFeature.setAttribute( idx, QVariant( v.toDateTime().toMSecsSinceEpoch() ) );
else if ( v.type() != dataProviderFields.at( idx ).type() )
cachedFeature.setAttribute( idx, QgsVectorDataProvider::convertValue( dataProviderFields.at( idx ).type(), v.toString() ) );
else
cachedFeature.setAttribute( idx, v );
}
}
if ( mDistinctSelect && md5Idx >= 0 )
cachedFeature.setAttribute( md5Idx, QVariant( md5 ) );
cachedFeature.setAttribute( gmlidIdx, QVariant( gmlId ) );
cachedFeature.setAttribute( genCounterIdx, QVariant( genCounter ) );
// valid
cachedFeature.setValid( true );
cachedFeature.setFields( dataProviderFields ); // allow name-based attribute lookups
featureListToCache.push_back( cachedFeature );
}
// In case we would a WFS-T insert, while another thread download features,
// take a mutex
{
QMutexLocker lockerWrite( &mCacheWriteMutex );
bool cacheOk = mCacheDataProvider->addFeatures( featureListToCache );
// Update the feature ids of the non-cached feature, i.e. the one that
// will be notified to the user, from the feature id of the database
// That way we will always have a consistant feature id, even in case of
// paging or BBOX request
Q_ASSERT( featureListToCache.size() == updatedFeatureList.size() );
for ( int i = 0; i < updatedFeatureList.size(); i++ )
{
if ( cacheOk )
updatedFeatureList[i].first.setFeatureId( featureListToCache[i].id() );
else
updatedFeatureList[i].first.setFeatureId( mTotalFeaturesAttemptedToBeCached + i + 1 );
}
{
QMutexLocker locker( &mMutex );
if ( mRequestLimit != 1 )
{
if ( !mFeatureCountExact )
mFeatureCount += featureListToCache.size();
mTotalFeaturesAttemptedToBeCached += featureListToCache.size();
if ( !localComputedExtent.isNull() && mComputedExtent.isNull() && !mTryFetchingOneFeature &&
!localComputedExtent.intersects( mCapabilityExtent ) )
{
QgsMessageLog::logMessage( tr( "Layer extent reported by the server is not correct. "
"You may need to zoom again on layer while features are being downloaded" ), tr( "WFS" ) );
}
mComputedExtent = localComputedExtent;
}
}
}
featureList = updatedFeatureList;
emit extentUpdated();
QgsDebugMsg( QString( "end %1" ).arg( featureList.size() ) );
}
QgsRectangle QgsWFSSharedData::computedExtent()
{
QMutexLocker locker( &mMutex );
return mComputedExtent;
}
void QgsWFSSharedData::pushError( const QString& errorMsg )
{
QgsMessageLog::logMessage( errorMsg, tr( "WFS" ) );
emit raiseError( errorMsg );
}
/** Called by QgsWFSFeatureDownloader::run() at the end of the download process. */
void QgsWFSSharedData::endOfDownload( bool success, int featureCount,
bool truncatedResponse,
bool interrupted,
QString errorMsg )
{
QMutexLocker locker( &mMutex );
if ( !success && !interrupted )
{
QString errorMsgOut( tr( "Download of features for layer %1 failed or partially failed: %2. You may attempt reloading the layer with F5" ).arg( mURI.typeName() ).arg( errorMsg ) );
pushError( errorMsgOut );
}
bool bDownloadLimit = truncatedResponse || ( !mCaps.supportsPaging && featureCount == mMaxFeatures && mMaxFeatures > 0 );