code: public ClassNode lookupClassNodeFor(String type) {
          for (ClassNode cn : typeCheckingVisitor.getSourceUnit().getAST().getClasses()) {
              if (cn.getName().equals(type))
                  return cn;
          }
  
          return null;
      }
docs: Lookup a ClassNode by its name from the source unit
  
  @param type the name of the class whose ClassNode we want to lookup
  @return a ClassNode representing the class