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layerobserver.cpp
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layerobserver.cpp
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/***************************************************************************
layerobserver.cpp
-----------------
begin : Apr 2020
copyright : (C) 2020 by Ivan Ivanov
email : ivan@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 "layerobserver.h"
#include "qfieldcloudutils.h"
#include <QDebug>
#include <QDir>
#include <qgsfeature.h>
#include <qgsfeatureiterator.h>
#include <qgsfeaturerequest.h>
#include <qgsmessagelog.h>
#include <qgsvectorlayereditbuffer.h>
#include <appinterface.h>
LayerObserver::LayerObserver( const QgsProject *project )
: mProject( project )
{
QString dirPath = QFileInfo( mProject->absoluteFilePath() ).path();
mDeltaFileWrapper = std::make_unique<DeltaFileWrapper>( mProject, QStringLiteral( "%1/deltafile.json" ).arg( dirPath ) );
connect( mProject, &QgsProject::homePathChanged, this, &LayerObserver::onHomePathChanged );
connect( mProject, &QgsProject::layersAdded, this, &LayerObserver::onLayersAdded );
}
void LayerObserver::reset( bool isHardReset ) const
{
if ( isHardReset )
mDeltaFileWrapper->resetId();
return mDeltaFileWrapper->reset();
}
DeltaFileWrapper *LayerObserver::deltaFileWrapper() const
{
return mDeltaFileWrapper.get();
}
void LayerObserver::onHomePathChanged()
{
if ( mProject->homePath().isNull() )
return;
Q_ASSERT( mDeltaFileWrapper->hasError() || !mDeltaFileWrapper->isDirty() );
QString dirPath = QFileInfo( mProject->absoluteFilePath() ).path();
mDeltaFileWrapper = std::unique_ptr<DeltaFileWrapper>( new DeltaFileWrapper( mProject, QStringLiteral( "%1/deltafile.json" ).arg( dirPath ) ) );
emit deltaFileWrapperChanged();
mObservedLayerIds.clear();
if ( !QFieldCloudUtils::getProjectId( mProject->fileName() ).isEmpty() )
{
if ( mDeltaFileWrapper->hasError() )
QgsMessageLog::logMessage( QStringLiteral( "The current delta file wrapper experienced an error: %1" ).arg( mDeltaFileWrapper->errorString() ) );
addLayerListeners();
}
}
void LayerObserver::onLayersAdded( const QList<QgsMapLayer *> &layers )
{
Q_UNUSED( layers );
addLayerListeners();
}
void LayerObserver::onBeforeCommitChanges()
{
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( sender() );
QgsVectorLayerEditBuffer *eb = vl->editBuffer();
if ( !eb )
return;
const QgsFeatureIds deletedFids = eb->deletedFeatureIds();
const QgsFeatureIds changedGeometriesFids = qgis::listToSet( eb->changedGeometries().keys() );
const QgsFeatureIds changedAttributesFids = qgis::listToSet( eb->changedAttributeValues().keys() );
// NOTE QgsFeatureIds underlying implementation is QSet, so no need to check if the QgsFeatureId already exists
QgsFeatureIds changedFids;
for ( const QgsFeatureId fid : deletedFids )
changedFids.insert( fid );
for ( const QgsFeatureId fid : changedGeometriesFids )
changedFids.insert( fid );
for ( const QgsFeatureId fid : changedAttributesFids )
changedFids.insert( fid );
// NOTE we read the features from the dataProvider directly as we want to access the old values.
// If we use the layer, we get the values from the edit buffer.
QgsFeatureIterator featuresIt = vl->dataProvider()->getFeatures( QgsFeatureRequest( changedFids ) );
QgsChangedFeatures changedFeatures;
QgsFeature f;
// ? is it possible to use the iterator in a less ugly way? something like normal `for ( QgsFeature &f : it ) {}`
while ( featuresIt.nextFeature( f ) )
changedFeatures.insert( f.id(), f );
qInfo() << "LayerObserver::onBeforeCommitChanges: vl->id()=" << vl->id() << "sourcePkAttrPair=" << changedFids;
// NOTE no need to keep track of added features, as they are always present in the layer after commit
mChangedFeatures.insert( vl->id(), changedFeatures );
mPatchedFids.insert( vl->id(), QgsFeatureIds() );
}
void LayerObserver::onCommittedFeaturesAdded( const QString &localLayerId, const QgsFeatureList &addedFeatures )
{
if ( mDeltaFileWrapper->isDeltaBeingApplied() )
return;
const QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( sender() );
const QString sourceLayerId = DeltaFileWrapper::getSourceLayerId( vl );
const QPair<int, QString> localPkAttrPair = DeltaFileWrapper::getLocalPkAttribute( vl );
const QPair<int, QString> sourcePkAttrPair = DeltaFileWrapper::getSourcePkAttribute( vl );
qInfo() << "LayerObserver::onCommittedFeaturesAdded: sourcePkAttrPair=" << sourcePkAttrPair << " sourceLayerId=" << sourceLayerId;
for ( const QgsFeature &newFeature : addedFeatures )
{
qInfo() << " LayerObserver::onCommittedFeaturesAdded: adding create delta... FID=" << newFeature.id();
mDeltaFileWrapper->addCreate( localLayerId, sourceLayerId, localPkAttrPair.second, sourcePkAttrPair.second, newFeature );
}
}
void LayerObserver::onCommittedFeaturesRemoved( const QString &localLayerId, const QgsFeatureIds &deletedFeatureIds )
{
if ( mDeltaFileWrapper->isDeltaBeingApplied() )
return;
QgsChangedFeatures changedFeatures = mChangedFeatures.value( localLayerId );
const QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( sender() );
const QString sourceLayerId = DeltaFileWrapper::getSourceLayerId( vl );
const QPair<int, QString> localPkAttrPair = DeltaFileWrapper::getLocalPkAttribute( vl );
const QPair<int, QString> sourcePkAttrPair = DeltaFileWrapper::getSourcePkAttribute( vl );
qInfo() << "LayerObserver::onCommittedFeaturesRemoved: sourcePkAttrPair=" << sourcePkAttrPair << " sourceLayerId=" << sourceLayerId << " deletedFeatureIds=" << deletedFeatureIds;
for ( const QgsFeatureId &fid : deletedFeatureIds )
{
Q_ASSERT( changedFeatures.contains( fid ) );
QgsFeature oldFeature = changedFeatures.take( fid );
qInfo() << " LayerObserver::onCommittedFeaturesRemoved: adding delete delta... FID=" << fid;
mDeltaFileWrapper->addDelete( localLayerId, sourceLayerId, localPkAttrPair.second, sourcePkAttrPair.second, oldFeature );
}
mChangedFeatures.insert( localLayerId, changedFeatures );
}
void LayerObserver::onCommittedAttributeValuesChanges( const QString &localLayerId, const QgsChangedAttributesMap &changedAttributesValues )
{
if ( mDeltaFileWrapper->isDeltaBeingApplied() )
return;
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( sender() );
QgsFeatureIds patchedFids = mPatchedFids.value( localLayerId );
QgsChangedFeatures changedFeatures = mChangedFeatures.value( localLayerId );
const QgsFeatureIds changedAttributesValuesFids = qgis::listToSet( changedAttributesValues.keys() );
const QString sourceLayerId = DeltaFileWrapper::getSourceLayerId( vl );
const QPair<int, QString> localPkAttrPair = DeltaFileWrapper::getLocalPkAttribute( vl );
const QPair<int, QString> sourcePkAttrPair = DeltaFileWrapper::getSourcePkAttribute( vl );
qInfo() << "LayerObserver::onCommittedAttributeValuesChanges: sourcePkAttrPair=" << sourcePkAttrPair << " sourceLayerId=" << sourceLayerId << " changedAttributesValuesFids=" << changedAttributesValuesFids;
for ( const QgsFeatureId fid : changedAttributesValuesFids )
{
if ( patchedFids.contains( fid ) )
continue;
Q_ASSERT( changedFeatures.contains( fid ) );
patchedFids.insert( fid );
QgsFeature oldFeature = changedFeatures.take( fid );
QgsFeature newFeature = vl->getFeature( fid );
qInfo() << "LayerObserver::onCommittedAttributeValuesChanges: adding patch delta... FID=" << fid;
if ( vl->fields().indexOf( "fid_1" ) != -1 && localPkAttrPair.second == sourcePkAttrPair.second && newFeature.attribute( "fid" ) != newFeature.attribute( "fid_1" ) )
{
mLocalAndSourcePkAttrAreEqual = true;
}
mDeltaFileWrapper->addPatch( localLayerId, sourceLayerId, localPkAttrPair.second, sourcePkAttrPair.second, oldFeature, newFeature );
}
mPatchedFids.insert( localLayerId, patchedFids );
mChangedFeatures.insert( localLayerId, changedFeatures );
}
void LayerObserver::onCommittedGeometriesChanges( const QString &localLayerId, const QgsGeometryMap &changedGeometries )
{
if ( mDeltaFileWrapper->isDeltaBeingApplied() )
return;
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( sender() );
QgsFeatureIds patchedFids = mPatchedFids.value( localLayerId );
QgsChangedFeatures changedFeatures = mChangedFeatures.value( localLayerId );
const QgsFeatureIds changedGeometriesFids = qgis::listToSet( changedGeometries.keys() );
const QString sourceLayerId = DeltaFileWrapper::getSourceLayerId( vl );
const QPair<int, QString> localPkAttrPair = DeltaFileWrapper::getLocalPkAttribute( vl );
const QPair<int, QString> sourcePkAttrPair = DeltaFileWrapper::getSourcePkAttribute( vl );
qInfo() << "LayerObserver::onCommittedGeometriesChanges: sourcePkAttrPair=" << sourcePkAttrPair << " sourceLayerId=" << sourceLayerId << " changedGeometriesFids=" << changedGeometriesFids;
for ( const QgsFeatureId &fid : changedGeometriesFids )
{
if ( patchedFids.contains( fid ) )
continue;
Q_ASSERT( changedFeatures.contains( fid ) );
patchedFids.insert( fid );
QgsFeature oldFeature = changedFeatures.take( fid );
QgsFeature newFeature = vl->getFeature( fid );
qInfo() << " LayerObserver::onCommittedGeometriesChanges: adding patch delta... FID=" << fid;
if ( vl->fields().indexOf( "fid_1" ) != -1 && localPkAttrPair.second == sourcePkAttrPair.second && newFeature.attribute( "fid" ) != newFeature.attribute( "fid_1" ) )
{
mLocalAndSourcePkAttrAreEqual = true;
}
mDeltaFileWrapper->addPatch( localLayerId, sourceLayerId, localPkAttrPair.second, sourcePkAttrPair.second, oldFeature, newFeature );
}
mPatchedFids.insert( localLayerId, patchedFids );
mChangedFeatures.insert( localLayerId, changedFeatures );
}
void LayerObserver::onEditingStopped()
{
const QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( sender() );
const QString layerId = vl->id();
mPatchedFids.take( layerId );
mChangedFeatures.take( layerId );
if ( !mDeltaFileWrapper->toFile() )
{
// TODO somehow indicate the user that writing failed
QgsMessageLog::logMessage( QStringLiteral( "Failed writing JSON file" ) );
}
if ( vl->source().contains( QStringLiteral( "data.gpkg" ) ) && mLocalAndSourcePkAttrAreEqual )
{
AppInterface::instance()->sendLog( QStringLiteral( "Called LayerObserver::onEditingStopped!" ) );
mLocalAndSourcePkAttrAreEqual = false;
}
emit layerEdited( layerId );
}
void LayerObserver::addLayerListeners()
{
const QList<QgsMapLayer *> layers = mProject->mapLayers().values();
// we should keep track only of the layers on cloud projects
if ( QFieldCloudUtils::getProjectId( mProject->fileName() ).isEmpty() )
return;
for ( QgsMapLayer *layer : layers )
{
QgsVectorLayer *vl = qobject_cast<QgsVectorLayer *>( layer );
if ( vl && vl->isValid() )
{
if ( mObservedLayerIds.contains( vl->id() ) )
continue;
if ( !vl->readOnly() && QFieldCloudUtils::isCloudAction( vl ) )
{
// Ignore all layers that cannot determine a primary key column
if ( DeltaFileWrapper::getLocalPkAttribute( vl ).first == -1 )
{
QgsMessageLog::logMessage( tr( "Failed to find a local primary key column in layer \"%1\"" ).arg( layer->name() ) );
continue;
}
if ( DeltaFileWrapper::getSourcePkAttribute( vl ).first == -1 )
{
QgsMessageLog::logMessage( tr( "Failed to find a source primary key column in layer \"%1\"" ).arg( layer->name() ) );
continue;
}
qInfo() << "LayerObserver::addLayerListeners: vl->getLocalPkAttribute()=" << DeltaFileWrapper::getLocalPkAttribute( vl );
qInfo() << "LayerObserver::addLayerListeners: vl->getSourcePkAttribute()=" << DeltaFileWrapper::getSourcePkAttribute( vl );
qInfo() << "LayerObserver::addLayerListeners: vl->customProperties()=" << vl->customProperties().keys();
qInfo() << "LayerObserver::addLayerListeners: vl->originalXmlProperties()=" << vl->originalXmlProperties();
disconnect( vl, &QgsVectorLayer::beforeCommitChanges, this, &LayerObserver::onBeforeCommitChanges );
disconnect( vl, &QgsVectorLayer::committedFeaturesAdded, this, &LayerObserver::onCommittedFeaturesAdded );
disconnect( vl, &QgsVectorLayer::committedFeaturesRemoved, this, &LayerObserver::onCommittedFeaturesRemoved );
disconnect( vl, &QgsVectorLayer::committedAttributeValuesChanges, this, &LayerObserver::onCommittedAttributeValuesChanges );
disconnect( vl, &QgsVectorLayer::committedGeometriesChanges, this, &LayerObserver::onCommittedGeometriesChanges );
// TODO use the future "afterCommitChanges" signal
disconnect( vl, &QgsVectorLayer::editingStopped, this, &LayerObserver::onEditingStopped );
// for `cloud` projects, we keep track of any change that has occurred
connect( vl, &QgsVectorLayer::beforeCommitChanges, this, &LayerObserver::onBeforeCommitChanges );
connect( vl, &QgsVectorLayer::committedFeaturesAdded, this, &LayerObserver::onCommittedFeaturesAdded );
connect( vl, &QgsVectorLayer::committedFeaturesRemoved, this, &LayerObserver::onCommittedFeaturesRemoved );
connect( vl, &QgsVectorLayer::committedAttributeValuesChanges, this, &LayerObserver::onCommittedAttributeValuesChanges );
connect( vl, &QgsVectorLayer::committedGeometriesChanges, this, &LayerObserver::onCommittedGeometriesChanges );
// TODO use the future "afterCommitChanges" signal
connect( vl, &QgsVectorLayer::editingStopped, this, &LayerObserver::onEditingStopped );
mObservedLayerIds.insert( vl->id() );
}
}
}
}