public GenericEdgeSet<T> copy(IntSet vertices) {        
        GenericEdgeSet<T> copy = new GenericEdgeSet<T>(rootVertex);
        for (Map.Entry<Integer,Set<T>> e : vertexToEdges.asMap().entrySet()) {
            if (vertices.contains(e.getKey())) {
                copy.vertexToEdges.putMany(e.getKey(), e.getValue());
            }
        }
        return copy;
    }
public GenericEdgeSet < T > copy ( IntSet vertices ) { GenericEdgeSet < T > copy = new GenericEdgeSet < T > ( rootVertex ) ; for ( Map . Entry < Integer , Set < T > > e : vertexToEdges . asMap ( ) . entrySet ( ) ) { if ( vertices . contains ( e . getKey ( ) ) ) { copy . vertexToEdges . putMany ( e . getKey ( ) , e . getValue ( ) ) ; } } return copy ; }
{@inheritDoc}