private JavaClass findClass(String classname) {
   for (JavaClass jClass : graph.vertexSet()) {
     if (jClass.getName().equals(classname)) {
       return jClass;
     }
   }
   return null;
 }
 public Set<String> getIndexedClasses() {
   Set<String> classes = newHashSet();
   Set<JavaClass> vertexSet = graph.vertexSet();
   for (JavaClass each : vertexSet) {
     classes.add(each.getName());
   }
   return classes;
 }