/**
* Returns a shallow copy of this graph instance. Neither edges nor vertices are cloned.
*
* @return a shallow copy of this set.
* @throws RuntimeException
* @see java.lang.Object#clone()
*/
public Object clone() {
try {
TypeUtil<AbstractBaseGraph<V, E>> typeDecl = null;
AbstractBaseGraph<V, E> newGraph = TypeUtil.uncheckedCast(super.clone(), typeDecl);
newGraph.edgeMap = new LinkedHashMap<E, IntrusiveEdge>();
newGraph.edgeFactory = this.edgeFactory;
newGraph.unmodifiableEdgeSet = null;
newGraph.unmodifiableVertexSet = null;
// NOTE: it's important for this to happen in an object
// method so that the new inner class instance gets associated with
// the right outer class instance
newGraph.specifics = newGraph.createSpecifics();
Graphs.addGraph(newGraph, this);
return newGraph;
} catch (CloneNotSupportedException e) {
e.printStackTrace();
throw new RuntimeException();
}
}
/** @see Graph#getEdgeTarget(Object) */
public V getEdgeTarget(E e) {
return TypeUtil.uncheckedCast(getIntrusiveEdge(e).target, vertexTypeDecl);
}
/** @see Graph#getEdgeSource(Object) */
public V getEdgeSource(E e) {
return TypeUtil.uncheckedCast(getIntrusiveEdge(e).source, vertexTypeDecl);
}