app/decorators/data_bundle_decorator.rb

#
# Licensed to the Apache Software Foundation (ASF) under one
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# 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
#
# 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
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class DataBundleDecorator < Draper::Decorator
  delegate_all

  FILE_TYPES = {
      inputs: '/inputs/',
      intermediates: '/intermediates/',
      outputs: '/outputs/'
  }

  FILE_TYPES.each do |type_key, type_name|
    define_method :"#{type_key}" do
      manifest['aggregates'].select { |files| files['folder'].start_with?(type_name) }
    end
  end

  def manifest
    if @manifest.nil?
      file = File.new("#{object.file.root}/#{object.file.store_dir}/#{DataBundle::EXTRACTED_PATH}/.ro/manifest.json", 'r')
      @manifest = JSON.parse(file.read)
    end

    @manifest
  end
end