code: public static JavaWrapper getWrapper(final Class c) {
          JavaWrapper w = _wrappers.get(c);
          if (w == null) {
              w = new JavaWrapper(c);
              _wrappers.put(c, w);
          }
          return w;
      }
docs: Returns an existing Wrapper instance associated with a class, or creates a new one.
  
  @param c the class to be wrapped
  @return the wrapped