code: protected List<Class> getClassCache(Class cls, String pkgname) {
      return m_CacheClasses.get(cls.getName() + "-" + pkgname);
    }
docs: returns the list of classes associated with this class and package, if
  available, otherwise null.
  
  @param cls		the class to get the classes for
  @param pkgname	the package name for the classes
  @return		the classes if found, otherwise null