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qgsrelationmanager.cpp
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qgsrelationmanager.cpp
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/***************************************************************************
qgsrelationmanager.cpp
--------------------------------------
Date : 1.3.2013
Copyright : (C) 2013 Matthias Kuhn
Email : matthias at opengis 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. *
* *
***************************************************************************/
#include "qgsrelationmanager.h"
#include "qgsapplication.h"
#include "qgslogger.h"
#include "qgsproject.h"
#include "qgsvectordataprovider.h"
#include "qgsvectorlayer.h"
QgsRelationManager::QgsRelationManager( QgsProject *project )
: QObject( project )
, mProject( project )
{
if ( mProject )
{
// TODO: QGIS 4 remove: relations are now stored with the layer style
connect( project, &QgsProject::readProjectWithContext, this, &QgsRelationManager::readProject );
// TODO: QGIS 4 remove: relations are now stored with the layer style
connect( project, &QgsProject::writeProject, this, &QgsRelationManager::writeProject );
connect( project, &QgsProject::layersRemoved, this, &QgsRelationManager::layersRemoved );
}
}
void QgsRelationManager::setRelations( const QList<QgsRelation> &relations )
{
mRelations.clear();
const auto constRelations = relations;
for ( const QgsRelation &rel : constRelations )
{
addRelation( rel );
}
emit changed();
}
QMap<QString, QgsRelation> QgsRelationManager::relations() const
{
return mRelations;
}
void QgsRelationManager::addRelation( const QgsRelation &relation )
{
// Do not add relations to layers that do not exist
if ( !( relation.referencingLayer() && relation.referencedLayer() ) )
return;
mRelations.insert( relation.id(), relation );
if ( mProject )
mProject->setDirty( true );
emit changed();
}
void QgsRelationManager::updateRelationsStatus()
{
for ( auto relation : mRelations )
{
relation.updateRelationStatus();
}
}
void QgsRelationManager::removeRelation( const QString &id )
{
mRelations.remove( id );
emit changed();
}
void QgsRelationManager::removeRelation( const QgsRelation &relation )
{
mRelations.remove( relation.id() );
emit changed();
}
QgsRelation QgsRelationManager::relation( const QString &id ) const
{
return mRelations.value( id );
}
QList<QgsRelation> QgsRelationManager::relationsByName( const QString &name ) const
{
QList<QgsRelation> relations;
const auto constMRelations = mRelations;
for ( const QgsRelation &rel : constMRelations )
{
if ( QString::compare( rel.name(), name, Qt::CaseInsensitive ) == 0 )
relations << rel;
}
return relations;
}
void QgsRelationManager::clear()
{
mRelations.clear();
emit changed();
}
QList<QgsRelation> QgsRelationManager::referencingRelations( const QgsVectorLayer *layer, int fieldIdx ) const
{
if ( !layer )
{
return mRelations.values();
}
QList<QgsRelation> relations;
const auto constMRelations = mRelations;
for ( const QgsRelation &rel : constMRelations )
{
if ( rel.referencingLayer() == layer )
{
if ( fieldIdx != -2 )
{
bool containsField = false;
const auto constFieldPairs = rel.fieldPairs();
for ( const QgsRelation::FieldPair &fp : constFieldPairs )
{
if ( fieldIdx == layer->fields().lookupField( fp.referencingField() ) )
{
containsField = true;
break;
}
}
if ( !containsField )
{
continue;
}
}
relations.append( rel );
}
}
return relations;
}
QList<QgsRelation> QgsRelationManager::referencedRelations( const QgsVectorLayer *layer ) const
{
if ( !layer )
{
return mRelations.values();
}
QList<QgsRelation> relations;
const auto constMRelations = mRelations;
for ( const QgsRelation &rel : constMRelations )
{
if ( rel.referencedLayer() == layer )
{
relations.append( rel );
}
}
return relations;
}
void QgsRelationManager::readProject( const QDomDocument &doc, QgsReadWriteContext &context )
{
mRelations.clear();
QDomNodeList nodes = doc.elementsByTagName( QStringLiteral( "relations" ) );
if ( nodes.count() )
{
QDomNode node = nodes.item( 0 );
QDomNodeList relationNodes = node.childNodes();
int relCount = relationNodes.count();
for ( int i = 0; i < relCount; ++i )
{
addRelation( QgsRelation::createFromXml( relationNodes.at( i ), context ) );
}
}
else
{
QgsDebugMsg( QStringLiteral( "No relations data present in this document" ) );
}
emit relationsLoaded();
emit changed();
}
void QgsRelationManager::writeProject( QDomDocument &doc )
{
QDomNodeList nl = doc.elementsByTagName( QStringLiteral( "qgis" ) );
if ( !nl.count() )
{
QgsDebugMsg( QStringLiteral( "Unable to find qgis element in project file" ) );
return;
}
QDomNode qgisNode = nl.item( 0 ); // there should only be one
QDomElement relationsNode = doc.createElement( QStringLiteral( "relations" ) );
qgisNode.appendChild( relationsNode );
const auto constMRelations = mRelations;
for ( const QgsRelation &relation : constMRelations )
{
relation.writeXml( relationsNode, doc );
}
}
void QgsRelationManager::layersRemoved( const QStringList &layers )
{
bool relationsChanged = false;
const auto constLayers = layers;
for ( const QString &layer : constLayers )
{
QMapIterator<QString, QgsRelation> it( mRelations );
while ( it.hasNext() )
{
it.next();
if ( it.value().referencedLayerId() == layer
|| it.value().referencingLayerId() == layer )
{
mRelations.remove( it.key() );
relationsChanged = true;
}
}
}
if ( relationsChanged )
{
emit changed();
}
}
static bool hasRelationWithEqualDefinition( const QList<QgsRelation> &existingRelations, const QgsRelation &relation )
{
const auto constExistingRelations = existingRelations;
for ( const QgsRelation &cur : constExistingRelations )
{
if ( cur.hasEqualDefinition( relation ) ) return true;
}
return false;
}
QList<QgsRelation> QgsRelationManager::discoverRelations( const QList<QgsRelation> &existingRelations, const QList<QgsVectorLayer *> &layers )
{
QList<QgsRelation> result;
const auto constLayers = layers;
for ( const QgsVectorLayer *layer : constLayers )
{
const auto constDiscoverRelations = layer->dataProvider()->discoverRelations( layer, layers );
for ( const QgsRelation &relation : constDiscoverRelations )
{
if ( !hasRelationWithEqualDefinition( existingRelations, relation ) )
{
result.append( relation );
}
}
}
return result;
}