private UmlRelation GetRelation <T>(UmlClass startClass, UmlClass endClass, string name = null, string startMultiplicity = "1", string endMultiplicity = "1")
{
var rel =
Relations.FirstOrDefault(
r => r is T && r.StartClass == startClass && r.EndClass == endClass && (name == null || r.Label.ToLower() == name.ToLower())
);
if (rel != null)
{
if (rel.StartMultiplicity != startMultiplicity || rel.EndMultiplicity != endMultiplicity)
{
throw new ArgumentException("Relation already exists but StartMultiplicity or EndMultiplicity is different");
}
return(rel);
}
return(null);
}
public virtual Tuple <Relation, Relation> GetNextRelationPair()
{
var first = Relations.FirstOrDefault(relation => relation.IsChosen == ChosenState.HadNotChosen);
if (first == null)
{
return(null);
}
var second = Relations.SingleOrDefault(
relation => relation.Source.Equals(first.Destination) &&
relation.Destination.Equals(first.Source));
if (second == null)
{
throw new Exception(
$"{this} has not relation {first.Destination} - {first.Source} " +
$"although has {first.Source} - {first.Destination}");
}
return(new Tuple <Relation, Relation>(first, second));
}