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qgsgeometryvalidationservice.cpp
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qgsgeometryvalidationservice.cpp
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/***************************************************************************
qgsgeometryvalidationservice.cpp
--------------------------------------
Date : 7.9.2018
Copyright : (C) 2018 by Matthias Kuhn
email : matthias@opengis.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. *
* *
***************************************************************************/
#include "qgsgeometryvalidationservice.h"
#include "qgsproject.h"
#include "qgsvectorlayer.h"
#include "qgsgeometryoptions.h"
#include "qgsanalysis.h"
#include "qgsgeometrycheckregistry.h"
#include "qgsgeometrycheckfactory.h"
#include "qgsvectorlayereditbuffer.h"
#include "qgsvectorlayerfeaturepool.h"
#include "qgsfeedback.h"
#include "qgsreadwritelocker.h"
#include "qgsmessagebar.h"
#include "qgsmessagebaritem.h"
#include <QtConcurrent>
#include <QFutureWatcher>
QgsGeometryValidationService::QgsGeometryValidationService( QgsProject *project )
: mProject( project )
{
connect( project, &QgsProject::layersAdded, this, &QgsGeometryValidationService::onLayersAdded );
}
void QgsGeometryValidationService::fixError( QgsGeometryCheckError *error, int method )
{
QgsGeometryCheck::Changes changes;
error->check()->fixError( mFeaturePools, error, method, QMap<QString, int>(), changes );
error->setFixed( method );
QgsFeaturePool *featurePool = mFeaturePools.value( error->layerId() );
QgsVectorLayer *layer = nullptr;
if ( featurePool )
layer = featurePool->layer();
else
{
// Some checks don't tell us on which layer they are because they are able to do cross-layer checks.
// E.g. the gap check will report in such a way
for ( auto layerCheck = mLayerChecks.constBegin(); layerCheck != mLayerChecks.constEnd(); ++layerCheck )
{
const QList<std::shared_ptr<QgsGeometryCheckError>> &topologyCheckErrors = layerCheck.value().topologyCheckErrors;
for ( const auto &checkError : topologyCheckErrors )
{
if ( checkError.get() == error )
{
layer = layerCheck.key();
break;
}
}
}
}
if ( layer )
{
layer->triggerRepaint();
emit topologyErrorUpdated( layer, error );
}
}
void QgsGeometryValidationService::onLayersAdded( const QList<QgsMapLayer *> &layers )
{
for ( QgsMapLayer *layer : layers )
{
QgsVectorLayer *vectorLayer = qobject_cast<QgsVectorLayer *>( layer );
if ( vectorLayer )
{
connect( vectorLayer->geometryOptions(), &QgsGeometryOptions::checkConfigurationChanged, this, [this, vectorLayer]()
{
enableLayerChecks( vectorLayer );
} );
connect( vectorLayer->geometryOptions(), &QgsGeometryOptions::geometryChecksChanged, this, [this, vectorLayer]()
{
enableLayerChecks( vectorLayer );
} );
connect( vectorLayer, &QgsVectorLayer::destroyed, this, [vectorLayer, this]()
{
cleanupLayerChecks( vectorLayer );
mLayerChecks.remove( vectorLayer );
} );
enableLayerChecks( vectorLayer );
}
}
}
void QgsGeometryValidationService::onFeatureAdded( QgsVectorLayer *layer, QgsFeatureId fid )
{
if ( !mLayerChecks[layer].topologyChecks.empty() )
{
invalidateTopologyChecks( layer );
}
processFeature( layer, fid );
}
void QgsGeometryValidationService::onGeometryChanged( QgsVectorLayer *layer, QgsFeatureId fid, const QgsGeometry &geometry )
{
Q_UNUSED( geometry )
// It would be nice to use the geometry here for the tests.
// But:
// 1. other codepaths to the checks also have no geometry (feature added / feature deleted)
// 2. and looking it up from the edit buffer (in memory) is really fast.
// so in short: it's still a good idea, but not as important as on first thought.
if ( !mLayerChecks[layer].topologyChecks.empty() )
{
invalidateTopologyChecks( layer );
}
processFeature( layer, fid );
}
void QgsGeometryValidationService::onFeatureDeleted( QgsVectorLayer *layer, QgsFeatureId fid )
{
if ( !mLayerChecks[layer].topologyChecks.empty() )
{
invalidateTopologyChecks( layer );
}
mLayerChecks[layer].singleFeatureCheckErrors.remove( fid );
// There should be no geometry errors on a non-existent feature, right?
emit geometryCheckCompleted( layer, fid, QList<std::shared_ptr<QgsSingleGeometryCheckError>>() );
}
void QgsGeometryValidationService::onBeforeCommitChanges( QgsVectorLayer *layer )
{
if ( mLayerChecks[layer].topologyChecks.empty() && !layer->allowCommit() )
{
showMessage( tr( "Geometry errors have been found. Please fix the errors before saving the layer." ) );
}
if ( !mBypassChecks && !mLayerChecks[layer].topologyChecks.empty() )
{
if ( !layer->allowCommit() )
{
showMessage( tr( "Running geometry validation checks before saving…" ) );
}
mLayerChecks[layer].commitPending = true;
triggerTopologyChecks( layer );
}
}
void QgsGeometryValidationService::onEditingStopped( QgsVectorLayer *layer )
{
cancelTopologyCheck( layer );
clearTopologyChecks( layer );
}
void QgsGeometryValidationService::showMessage( const QString &message )
{
mMessageBar->popWidget( mMessageBarItem );
mMessageBarItem = QgsMessageBar::createMessage( tr( "Geometry Validation" ), message );
mMessageBarItem->setDuration( 5 );
mMessageBar->pushItem( mMessageBarItem );
}
void QgsGeometryValidationService::cleanupLayerChecks( QgsVectorLayer *layer )
{
if ( !mLayerChecks.contains( layer ) )
return;
VectorLayerCheckInformation &checkInformation = mLayerChecks[layer];
cancelTopologyCheck( layer );
clearTopologyChecks( layer );
qDeleteAll( checkInformation.singleFeatureChecks );
checkInformation.singleFeatureChecks.clear();
qDeleteAll( checkInformation.topologyChecks );
checkInformation.topologyChecks.clear();
checkInformation.context.reset();
}
void QgsGeometryValidationService::enableLayerChecks( QgsVectorLayer *layer )
{
if ( layer->geometryOptions()->geometryChecks().empty() && !mLayerChecks.contains( layer ) )
return;
VectorLayerCheckInformation &checkInformation = mLayerChecks[layer];
cleanupLayerChecks( layer );
if ( layer->geometryOptions()->geometryChecks().empty() )
{
for ( QMetaObject::Connection connection : qgis::as_const( checkInformation.connections ) )
{
disconnect( connection );
}
checkInformation.connections.clear();
return;
}
int precision = 0;
if ( layer->geometryOptions()->geometryPrecision() == 0 )
precision = 8;
else
{
precision = log10( layer->geometryOptions()->geometryPrecision() ) * -1;
if ( precision < 1 || precision > 13 )
precision = 8;
}
checkInformation.context = qgis::make_unique<QgsGeometryCheckContext>( precision, mProject->crs(), mProject->transformContext() );
QList<QgsGeometryCheck *> layerChecks;
QgsGeometryCheckRegistry *checkRegistry = QgsAnalysis::instance()->geometryCheckRegistry();
const QStringList activeChecks = layer->geometryOptions()->geometryChecks();
const QList<QgsGeometryCheckFactory *> singleCheckFactories = checkRegistry->geometryCheckFactories( layer, QgsGeometryCheck::FeatureNodeCheck, QgsGeometryCheck::AvailableInValidation );
for ( QgsGeometryCheckFactory *factory : singleCheckFactories )
{
const QString checkId = factory->id();
if ( activeChecks.contains( checkId ) )
{
const QVariantMap checkConfiguration = layer->geometryOptions()->checkConfiguration( checkId );
layerChecks.append( factory->createGeometryCheck( checkInformation.context.get(), checkConfiguration ) );
}
}
QList<QgsSingleGeometryCheck *> singleGeometryChecks;
for ( QgsGeometryCheck *check : qgis::as_const( layerChecks ) )
{
Q_ASSERT( dynamic_cast<QgsSingleGeometryCheck *>( check ) );
singleGeometryChecks.append( dynamic_cast<QgsSingleGeometryCheck *>( check ) );
}
checkInformation.singleFeatureChecks = singleGeometryChecks;
// Topology checks
QList<QgsGeometryCheck *> topologyChecks;
const QList<QgsGeometryCheckFactory *> topologyCheckFactories = checkRegistry->geometryCheckFactories( layer, QgsGeometryCheck::LayerCheck, QgsGeometryCheck::AvailableInValidation );
for ( QgsGeometryCheckFactory *factory : topologyCheckFactories )
{
const QString checkId = factory->id();
if ( activeChecks.contains( checkId ) )
{
const QVariantMap checkConfiguration = layer->geometryOptions()->checkConfiguration( checkId );
topologyChecks.append( factory->createGeometryCheck( checkInformation.context.get(), checkConfiguration ) );
}
}
checkInformation.topologyChecks = topologyChecks;
if ( checkInformation.connections.empty() )
{
// Connect to all modifications on a layer that can introduce a geometry or topology error
// Also connect to the beforeCommitChanges signal, so we can trigger topology checks
// We keep all connections around in a list, so if in the future all checks get disabled
// we can kill those connections to be sure the layer does not even get a tiny bit of overhead.
checkInformation.connections
<< connect( layer, &QgsVectorLayer::featureAdded, this, [this, layer]( QgsFeatureId fid )
{
onFeatureAdded( layer, fid );
} );
checkInformation.connections
<< connect( layer, &QgsVectorLayer::geometryChanged, this, [this, layer]( QgsFeatureId fid, const QgsGeometry & geometry )
{
onGeometryChanged( layer, fid, geometry );
} );
checkInformation.connections
<< connect( layer, &QgsVectorLayer::featureDeleted, this, [this, layer]( QgsFeatureId fid )
{
onFeatureDeleted( layer, fid );
} );
checkInformation.connections
<< connect( layer, &QgsVectorLayer::beforeCommitChanges, this, [this, layer]()
{
onBeforeCommitChanges( layer );
} );
checkInformation.connections
<< connect( layer, &QgsVectorLayer::editingStopped, this, [this, layer]()
{
onEditingStopped( layer );
} );
}
}
void QgsGeometryValidationService::cancelTopologyCheck( QgsVectorLayer *layer )
{
QFutureWatcher<void> *futureWatcher = mLayerChecks[layer].topologyCheckFutureWatcher;
if ( futureWatcher )
{
// Make sure no more checks are started first
futureWatcher->cancel();
// Tell all checks to stop asap
const auto feedbacks = mLayerChecks[layer].topologyCheckFeedbacks;
for ( QgsFeedback *feedback : feedbacks )
{
if ( feedback )
feedback->cancel();
}
futureWatcher->waitForFinished();
mLayerChecks[layer].topologyCheckFutureWatcher = nullptr;
}
}
void QgsGeometryValidationService::clearTopologyChecks( QgsVectorLayer *layer )
{
QList<std::shared_ptr<QgsGeometryCheckError>> &allErrors = mLayerChecks[layer].topologyCheckErrors;
allErrors.clear();
layer->setAllowCommit( mLayerChecks[layer].singleFeatureCheckErrors.empty() );
emit topologyChecksCleared( layer );
}
void QgsGeometryValidationService::invalidateTopologyChecks( QgsVectorLayer *layer )
{
cancelTopologyCheck( layer );
layer->setAllowCommit( false );
}
void QgsGeometryValidationService::processFeature( QgsVectorLayer *layer, QgsFeatureId fid )
{
emit geometryCheckStarted( layer, fid );
QgsGeometry geometry = layer->getGeometry( fid );
const auto &checks = mLayerChecks[layer].singleFeatureChecks;
mLayerChecks[layer].singleFeatureCheckErrors.remove( fid );
// The errors are going to be sent out via a signal. We cannot keep ownership in here (or can we?)
// nor can we be sure that a single slot is connected to the signal. So make it a shared_ptr.
QList<std::shared_ptr<QgsSingleGeometryCheckError>> allErrors;
for ( QgsSingleGeometryCheck *check : checks )
{
const auto errors = check->processGeometry( geometry );
for ( auto error : errors )
allErrors.append( std::shared_ptr<QgsSingleGeometryCheckError>( error ) );
}
if ( !allErrors.empty() )
mLayerChecks[layer].singleFeatureCheckErrors.insert( fid, allErrors );
if ( !mLayerChecks[layer].singleFeatureCheckErrors.empty() )
layer->setAllowCommit( false );
else if ( mLayerChecks[layer].topologyChecks.empty() )
layer->setAllowCommit( true );
emit geometryCheckCompleted( layer, fid, allErrors );
}
void QgsGeometryValidationService::setMessageBar( QgsMessageBar *messageBar )
{
mMessageBar = messageBar;
}
void QgsGeometryValidationService::triggerTopologyChecks( QgsVectorLayer *layer )
{
cancelTopologyCheck( layer );
clearTopologyChecks( layer );
layer->setAllowCommit( false );
QgsFeatureIds affectedFeatureIds;
if ( layer->editBuffer() )
{
affectedFeatureIds = layer->editBuffer()->changedGeometries().keys().toSet();
affectedFeatureIds.unite( layer->editBuffer()->addedFeatures().keys().toSet() );
}
QgsFeaturePool *featurePool = mFeaturePools.value( layer->id() );
if ( !featurePool )
{
featurePool = new QgsVectorLayerFeaturePool( layer );
mFeaturePools.insert( layer->id(), featurePool );
}
QList<std::shared_ptr<QgsGeometryCheckError>> &allErrors = mLayerChecks[layer].topologyCheckErrors;
QMap<QString, QgsFeatureIds> layerIds;
QgsFeatureRequest request = QgsFeatureRequest( affectedFeatureIds ).setNoAttributes();
QgsFeatureIterator it = layer->getFeatures( request );
QgsFeature feature;
QgsRectangle area;
while ( it.nextFeature( feature ) )
{
area.combineExtentWith( feature.geometry().boundingBox() );
}
QgsFeatureRequest areaRequest = QgsFeatureRequest().setFilterRect( area );
QgsFeatureIds checkFeatureIds = featurePool->getFeatures( areaRequest );
layerIds.insert( layer->id(), checkFeatureIds );
QgsGeometryCheck::LayerFeatureIds layerFeatureIds( layerIds );
const QList<QgsGeometryCheck *> checks = mLayerChecks[layer].topologyChecks;
QMap<const QgsGeometryCheck *, QgsFeedback *> feedbacks;
for ( QgsGeometryCheck *check : checks )
feedbacks.insert( check, new QgsFeedback() );
mLayerChecks[layer].topologyCheckFeedbacks = feedbacks.values();
QFuture<void> future = QtConcurrent::map( checks, [&allErrors, layerFeatureIds, layer, feedbacks, this]( const QgsGeometryCheck * check )
{
// Watch out with the layer pointer in here. We are running in a thread, so we do not want to actually use it
// except for using its address to report the error.
QList<QgsGeometryCheckError *> errors;
QStringList messages; // Do we really need these?
QgsFeedback *feedback = feedbacks.value( check );
check->collectErrors( mFeaturePools, errors, messages, feedback, layerFeatureIds );
QgsReadWriteLocker errorLocker( mTopologyCheckLock, QgsReadWriteLocker::Write );
QList<std::shared_ptr<QgsGeometryCheckError> > sharedErrors;
for ( QgsGeometryCheckError *error : errors )
{
sharedErrors.append( std::shared_ptr<QgsGeometryCheckError>( error ) );
}
allErrors.append( sharedErrors );
if ( !feedback->isCanceled() )
emit topologyChecksUpdated( layer, sharedErrors );
errorLocker.unlock();
} );
QFutureWatcher<void> *futureWatcher = new QFutureWatcher<void>();
futureWatcher->setFuture( future );
connect( futureWatcher, &QFutureWatcherBase::finished, this, [&allErrors, layer, feedbacks, futureWatcher, this]()
{
QgsReadWriteLocker errorLocker( mTopologyCheckLock, QgsReadWriteLocker::Read );
layer->setAllowCommit( allErrors.empty() && mLayerChecks[layer].singleFeatureCheckErrors.empty() );
errorLocker.unlock();
qDeleteAll( feedbacks.values() );
futureWatcher->deleteLater();
if ( mLayerChecks[layer].topologyCheckFutureWatcher == futureWatcher )
mLayerChecks[layer].topologyCheckFutureWatcher = nullptr;
if ( !allErrors.empty() || !mLayerChecks[layer].singleFeatureCheckErrors.empty() )
{
if ( mLayerChecks[layer].commitPending )
showMessage( tr( "Geometry errors have been found. Please fix the errors before saving the layer." ) );
else
showMessage( tr( "Geometry errors have been found." ) );
}
if ( allErrors.empty() && mLayerChecks[layer].singleFeatureCheckErrors.empty() && mLayerChecks[layer].commitPending )
{
mBypassChecks = true;
layer->commitChanges();
mBypassChecks = false;
mMessageBar->popWidget( mMessageBarItem );
mMessageBarItem = nullptr;
}
mLayerChecks[layer].commitPending = false;
} );
mLayerChecks[layer].topologyCheckFutureWatcher = futureWatcher;
}