text: # Copyright 2018 Google Inc.  All Rights Reserved.
  #
  # 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.
  
  """A PTransform for partitioning variants based on their reference_name."""
  
  from __future__ import absolute_import
  
  import apache_beam as beam
  from gcp_variant_transforms.beam_io import vcfio # pylint: disable=unused-import
  from gcp_variant_transforms.libs import variant_partition # pylint: disable=unused-import
  
  
  class PartitionVariants(beam.PartitionFn):
    """Partitions variants based on their reference_name."""
  
    def __init__(self, partition):
      # type: (variant_partition.VariantPartition) -> None
      self._partition = partition
  
    def partition_for(self, variant, _):
      # type: (vcfio.Variant, int) -> int
      return self._partition.get_partition(variant.reference_name, variant.start)
  