# coding=utf-8
#
# Licensed to the Apache Software Foundation (ASF) under one or more
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# The ASF licenses this file to You 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
#
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# pytype: skip-file
# pylint:disable=line-too-long

# beam-playground:
#   name: MapSideInputsSingleton
#   description: Demonstration of Map transform usage with side inputs as a singleton.
#   multifile: false
#   default_example: false
#   context_line: 41
#   categories:
#     - Core Transforms
#   complexity: BASIC
#   tags:
#     - transforms
#     - strings
#     - map


def map_side_inputs_singleton(test=None):
  # [START map_side_inputs_singleton]
  import apache_beam as beam

  with beam.Pipeline() as pipeline:
    chars = pipeline | 'Create chars' >> beam.Create(['# \n'])

    plants = (
        pipeline
        | 'Gardening plants' >> beam.Create([
            '# 🍓Strawberry\n',
            '# 🥕Carrot\n',
            '# 🍆Eggplant\n',
            '# 🍅Tomato\n',
            '# 🥔Potato\n',
        ])
        | 'Strip header' >> beam.Map(
            lambda text,
            chars: text.strip(chars),
            chars=beam.pvalue.AsSingleton(chars),
        )
        | beam.Map(print))
    # [END map_side_inputs_singleton]
    if test:
      test(plants)


if __name__ == '__main__':
  map_side_inputs_singleton()
