Class: Csvtool::Application::UseCases::RunRowExtraction

Inherits:
Object
  • Object
show all
Defined in:
lib/csvtool/application/use_cases/run_row_extraction.rb

Defined Under Namespace

Classes: Result

Instance Method Summary collapse

Constructor Details

#initialize(header_reader: Infrastructure::CSV::HeaderReader.new, row_streamer: Infrastructure::CSV::RowStreamer.new, csv_row_file_writer: nil) ⇒ RunRowExtraction

Returns a new instance of RunRowExtraction.



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# File 'lib/csvtool/application/use_cases/run_row_extraction.rb', line 18

def initialize(
  header_reader: Infrastructure::CSV::HeaderReader.new,
  row_streamer: Infrastructure::CSV::RowStreamer.new,
  csv_row_file_writer: nil
)
  @header_reader = header_reader
  @row_streamer = row_streamer
  @csv_row_file_writer = csv_row_file_writer || Infrastructure::Output::CsvRowFileWriter.new(row_streamer: @row_streamer)
end

Instance Method Details

#extract(session:, headers:, on_row: nil) ⇒ Object 



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# File 'lib/csvtool/application/use_cases/run_row_extraction.rb', line 41

def extract(session:, headers:, on_row: nil)
  if session.output_destination.file?
    stats = @csv_row_file_writer.call(
      output_path: session.output_destination.path,
      file_path: session.source.path,
      col_sep: session.source.separator,
      headers: headers,
      start_row: session.row_range.start_row,
      end_row: session.row_range.end_row
    )
    success(stats.merge(output_path: session.output_destination.path))
  else
    stats = @row_streamer.each_in_range(
      file_path: session.source.path,
      col_sep: session.source.separator,
      start_row: session.row_range.start_row,
      end_row: session.row_range.end_row
    ) { |fields| on_row.call(fields) if on_row }
    success(stats)
  end
rescue CSV::MalformedCSVError
  failure(:could_not_parse_csv)
rescue Errno::EACCES, Errno::ENOENT => e
  if session.output_destination.file?
    failure(:cannot_write_output_file, path: session.output_destination.path, error_class: e.class)
  else
    failure(:cannot_read_file, path: session.source.path)
  end
end

#read_headers(file_path:, col_sep:) ⇒ Object 



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# File 'lib/csvtool/application/use_cases/run_row_extraction.rb', line 28

def read_headers(file_path:, col_sep:)
  return failure(:file_not_found, path: file_path) unless File.file?(file_path)

  headers = @header_reader.call(file_path: file_path, col_sep: col_sep)
  return failure(:no_headers) if headers.empty?

  success(headers: headers)
rescue CSV::MalformedCSVError
  failure(:could_not_parse_csv)
rescue Errno::EACCES
  failure(:cannot_read_file, path: file_path)
end