<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_innerclasses(self):
 """ sequence of JavaInnerClassInfo instances describing the inner classes of this class definition reference: http://docs.oracle.com/javase/specs/jvms/se7/html/jvms-4.html#jvms-4.7.6 """
  # noqa

        buff = self.get_attribute("InnerClasses")
        if buff is None:
            return tuple()

        with unpack(buff) as up:
            return tuple(up.unpack_objects(JavaInnerClassInfo, self.cpool))