public VertexPair<V> getVertices( E e )
    {
        VertexPair<V> directedVertexPair = directedGraph.getVertices( e );
        return new VertexPair<V>( directedVertexPair.getTail(), directedVertexPair.getHead() );
    }
public VertexPair < V > getVertices ( E e ) { VertexPair < V > directedVertexPair = directedGraph . getVertices ( e ) ; return new VertexPair < V > ( directedVertexPair . getTail ( ) , directedVertexPair . getHead ( ) ) ; }
{@inheritDoc}