QgsRelation QgsRelation::createFromXml( const QDomNode &node )
{
QDomElement elem = node.toElement();
if ( elem.tagName() != "relation" )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Cannot create relation. Unexpected tag '%1'" ).arg( elem.tagName() ) );
}
QgsRelation relation;
QString referencingLayerId = elem.attribute( "referencingLayer" );
QString referencedLayerId = elem.attribute( "referencedLayer" );
QString id = elem.attribute( "id" );
QString name = elem.attribute( "name" );
const QMap<QString, QgsMapLayer*>& mapLayers = QgsMapLayerRegistry::instance()->mapLayers();
QgsMapLayer* referencingLayer = mapLayers[referencingLayerId];
QgsMapLayer* referencedLayer = mapLayers[referencedLayerId];
if ( !referencingLayer )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencingLayerId ) );
}
else if ( QgsMapLayer::VectorLayer != referencingLayer->type() )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencingLayerId ) );
}
if ( !referencedLayer )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencedLayerId ) );
}
else if ( QgsMapLayer::VectorLayer != referencedLayer->type() )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencedLayerId ) );
}
relation.mReferencingLayerId = referencingLayerId;
relation.mReferencingLayer = qobject_cast<QgsVectorLayer*>( referencingLayer );
relation.mReferencedLayerId = referencedLayerId;
relation.mReferencedLayer = qobject_cast<QgsVectorLayer*>( referencedLayer );
relation.mRelationId = id;
relation.mRelationName = name;
QDomNodeList references = elem.elementsByTagName( "fieldRef" );
for ( int i = 0; i < references.size(); ++i )
{
QDomElement refEl = references.at( i ).toElement();
QString referencingField = refEl.attribute( "referencingField" );
QString referencedField = refEl.attribute( "referencedField" );
relation.addFieldPair( referencingField, referencedField );
}
relation.updateRelationStatus();
return relation;
}
QgsRelation QgsRelation::createFromXml( const QDomNode &node, QgsReadWriteContext &context )
{
QDomElement elem = node.toElement();
if ( elem.tagName() != QLatin1String( "relation" ) )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Cannot create relation. Unexpected tag '%1'" ).arg( elem.tagName() ) );
}
QgsRelation relation;
QString referencingLayerId = elem.attribute( QStringLiteral( "referencingLayer" ) );
QString referencedLayerId = elem.attribute( QStringLiteral( "referencedLayer" ) );
QString id = elem.attribute( QStringLiteral( "id" ) );
QString name = context.projectTranslator()->translate( QStringLiteral( "project:relations" ), elem.attribute( QStringLiteral( "name" ) ) );
QString strength = elem.attribute( QStringLiteral( "strength" ) );
const QMap<QString, QgsMapLayer *> &mapLayers = QgsProject::instance()->mapLayers();
QgsMapLayer *referencingLayer = mapLayers[referencingLayerId];
QgsMapLayer *referencedLayer = mapLayers[referencedLayerId];
if ( !referencingLayer )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencingLayerId ) );
}
else if ( QgsMapLayer::VectorLayer != referencingLayer->type() )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencingLayerId ) );
}
if ( !referencedLayer )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which does not exist." ).arg( referencedLayerId ) );
}
else if ( QgsMapLayer::VectorLayer != referencedLayer->type() )
{
QgsLogger::warning( QApplication::translate( "QgsRelation", "Relation defined for layer '%1' which is not of type VectorLayer." ).arg( referencedLayerId ) );
}
relation.d->mReferencingLayerId = referencingLayerId;
relation.d->mReferencingLayer = qobject_cast<QgsVectorLayer *>( referencingLayer );
relation.d->mReferencedLayerId = referencedLayerId;
relation.d->mReferencedLayer = qobject_cast<QgsVectorLayer *>( referencedLayer );
relation.d->mRelationId = id;
relation.d->mRelationName = name;
if ( strength == QLatin1String( "Composition" ) )
{
relation.d->mRelationStrength = RelationStrength::Composition;
}
else
{
relation.d->mRelationStrength = RelationStrength::Association;
}
QDomNodeList references = elem.elementsByTagName( QStringLiteral( "fieldRef" ) );
for ( int i = 0; i < references.size(); ++i )
{
QDomElement refEl = references.at( i ).toElement();
QString referencingField = refEl.attribute( QStringLiteral( "referencingField" ) );
QString referencedField = refEl.attribute( QStringLiteral( "referencedField" ) );
relation.addFieldPair( referencingField, referencedField );
}
relation.updateRelationStatus();
return relation;
}