#!/usr/bin/env python3
# -*- encoding: utf-8 -*-

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#    http://www.apache.org/licenses/LICENSE-2.0
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'''keyedwindow.py: module for defining KeyedWindow'''

from heronpy.streamlet.window import Window

class KeyedWindow(object):
  """Transformation depending on Windowing pass on the window/key information
     using this class
  """
  def __init__(self, key, window):
    if not isinstance(window, Window):
      raise RuntimeError("Window of KeyedWindow has to be of type Window")
    self._key = key
    self._window = window

  def __repr__(self):
    return 'KeyedWindow {key: %s, window: %s}' % (self._key, self._window)