public IntSet predecessors(int vertex) {
        SparseWeightedDirectedTypedEdgeSet<T> edges = vertexToEdges.get(vertex);
         return (edges == null) 
             ? PrimitiveCollections.emptyIntSet()
             : PrimitiveCollections.unmodifiableSet(edges.predecessors());
    }
public IntSet predecessors ( int vertex ) { SparseWeightedDirectedTypedEdgeSet < T > edges = vertexToEdges . get ( vertex ) ; return ( edges == null ) ? PrimitiveCollections . emptyIntSet ( ) : PrimitiveCollections . unmodifiableSet ( edges . predecessors ( ) ) ; }
{@inheritDoc}