public synchronized Set<? extends Node<ElkClass>> getSuperClassesQuietly(
			ElkClassExpression classExpression, boolean direct)
			throws ElkException {
		try {
			return getSuperClasses(classExpression, direct);
		} catch (final ElkInconsistentOntologyException e) {
			// All classes are equivalent to each other, so also to owl:Nothing.
			final TaxonomyNode<ElkClass> node = getTaxonomyQuietly()
					.getBottomNode();
			return direct ? node.getDirectSuperNodes()
					: node.getAllSuperNodes();
		}
	}
public synchronized Set<? extends Node<ElkClass>> getSuperClassesQuietly(
			ElkClassExpression classExpression, boolean direct)
			throws ElkException {
		try {
			return getSuperClasses(classExpression, direct);
		} catch (final ElkInconsistentOntologyException e) {
			
			final TaxonomyNode<ElkClass> node = getTaxonomyQuietly()
					.getBottomNode();
			return direct ? node.getDirectSuperNodes()
					: node.getAllSuperNodes();
		}
	}
public synchronized Set < ? extends Node < ElkClass > > getSuperClassesQuietly ( ElkClassExpression classExpression , boolean direct ) throws ElkException { try { return getSuperClasses ( classExpression , direct ) ; } catch ( final ElkInconsistentOntologyException e ) { // All classes are equivalent to each other, so also to owl:Nothing. final TaxonomyNode < ElkClass > node = getTaxonomyQuietly ( ) . getBottomNode ( ) ; return direct ? node . getDirectSuperNodes ( ) : node . getAllSuperNodes ( ) ; } }
Return the (direct or indirect) superclasses of the given
{@link ElkClassExpression} as specified by the parameter. The method
returns a set of {@link Node}s, each of which representing an equivalent
class of superclasses. Calling of this method may trigger the computation
of the taxonomy, if it has not been done yet.

@param classExpression
the {@link ElkClassExpression} for which to return the
superclass {@link Node}s
@param direct
if {@code true}, only direct superclasses are returned
@return the set of {@link Node}s for direct or indirect superclasses of
the given {@link ElkClassExpression} according to the specified
parameter
@throws ElkException
if the result cannot be computed
Return the ( direct or indirect ) superclasses of the given { @link ElkClassExpression } as specified by the parameter . The method returns a set of { @link Node } s each of which representing an equivalent class of superclasses . Calling of this method may trigger the computation of the taxonomy if it has not been done yet .