/**
* Returns the destination of a relation. The destination of a relation is defined as the
* modelelement that receives this relation. If there are more then 1 destinations, only the first
* is returned. If there is no destination, null is returned. Examples of sources include
* classifiers that are types to associationends, usecases that are bases to extend and include
* relations and so on. In the case of an association, the destination is defined as the type of
* the second element in the connections list.
*
* @param relation
* @return MModelElement
*/
public MModelElement getDestination(MRelationship relation) {
if (relation instanceof MAssociation) {
MAssociation assoc = (MAssociation) relation;
List conns = assoc.getConnections();
if (conns.size() <= 1) return null;
return ((MAssociationEnd) conns.get(1)).getType();
}
if (relation instanceof MGeneralization) {
MGeneralization gen = (MGeneralization) relation;
return gen.getChild();
}
if (relation instanceof MDependency) {
MDependency dep = (MDependency) relation;
Collection col = dep.getClients();
if (col.isEmpty()) return null;
return (MModelElement) (col.toArray())[0];
}
if (relation instanceof MFlow) {
MFlow flow = (MFlow) relation;
Collection col = flow.getTargets();
if (col.isEmpty()) return null;
return (MModelElement) (col.toArray())[0];
}
if (relation instanceof MExtend) {
MExtend extend = (MExtend) relation;
return extend.getBase();
}
if (relation instanceof MInclude) {
MInclude include = (MInclude) relation;
return include.getAddition();
}
return null;
}
/**
* Returns the source of a relation. The source of a relation is defined as the modelelement that
* propagates this relation. If there are more then 1 sources, only the first is returned. If
* there is no source, null is returned. Examples of sources include classifiers that are types to
* associationends, usecases that are bases to extend and include relations and so on.
*
* @param relation
* @return MModelElement
*/
public MModelElement getSource(MRelationship relation) {
if (relation instanceof MAssociation) {
MAssociation assoc = (MAssociation) relation;
List conns = assoc.getConnections();
if (conns.isEmpty()) return null;
return ((MAssociationEnd) conns.get(0)).getType();
}
if (relation instanceof MGeneralization) {
MGeneralization gen = (MGeneralization) relation;
return gen.getParent();
}
if (relation instanceof MDependency) {
MDependency dep = (MDependency) relation;
Collection col = dep.getSuppliers();
if (col.isEmpty()) return null;
return (MModelElement) (col.toArray())[0];
}
if (relation instanceof MFlow) {
MFlow flow = (MFlow) relation;
Collection col = flow.getSources();
if (col.isEmpty()) return null;
return (MModelElement) (col.toArray())[0];
}
if (relation instanceof MExtend) {
MExtend extend = (MExtend) relation;
return extend.getExtension(); // we have to follow the arrows..
}
if (relation instanceof MInclude) {
MInclude include = (MInclude) relation;
return include.getBase();
}
return null;
}