heronpy/dsl/keyedwindow.py

# Copyright 2016 - Twitter, Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
'''keyedwindow.py: module for defining KeyedWindow'''

from heronpy.dsl.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)