void BulkData::destroy_relation( Entity & e1 , Entity & e2 , unsigned kind )
{
// When removing a relationship may need to
// remove part membership and set field relation pointer to NULL
PartSet del ;
bool to_e1 = false ;
std::vector<Relation>::iterator i ;
for ( i = e1.m_relation.end() ; i != e1.m_relation.begin() ; ) {
--i ;
if ( i->entity() == & e2 && i->kind() == kind ) {
if ( i->forward() ) {
clear_field_relations( e1 , i->entity_type() ,
i->identifier() ,
i->kind() );
deduce_part_relations( e1, e2, i->identifier(), i->kind(), del );
}
i = e1.m_relation.erase( i );
}
}
for ( i = e2.m_relation.end() ; i != e2.m_relation.begin() ; ) {
--i ;
if ( i->entity() == & e1 && i->kind() == kind ) {
if ( i->forward() ) {
clear_field_relations( e2 , i->entity_type() ,
i->identifier() ,
i->kind() );
deduce_part_relations( e2, e1, i->identifier(), i->kind(), del );
to_e1 = true ;
}
i = e2.m_relation.erase( i );
}
}
Entity & e_to = to_e1 ? e1 : e2 ;
{
PartSet keep ;
deduce_part_relations( e_to , keep );
if ( ! keep.empty() ) {
// Eliminate the 'keep' from the accumulated 'del'
for ( PartSet::iterator j = del.end() ; j != del.begin() ; ) {
--j ;
if ( contain( keep , **j ) ) { j = del.erase( j ); }
}
}
}
if ( ! del.empty() ) {
PartSet add ;
internal_change_entity_parts( e_to , add , del );
}
}
