private void replaceVertex(JavaClass newClass) {
    List<JavaClass> incomingEdges = getParents(newClass);

    graph.removeVertex(newClass);
    graph.addVertex(newClass);
    for (JavaClass each : incomingEdges) {
      graph.addEdge(each, newClass);
    }
  }
 private void updateParentReferences(JavaClass parentClass) {
   for (String child : parentClass.getImports()) {
     JavaClass childClass = findJavaClass(child);
     if ((childClass != null) && !childClass.equals(parentClass)) {
       if (graph.containsVertex(childClass)) {
         graph.addEdge(parentClass, childClass);
       }
     }
   }
 }