Class: Merger

Inherits:
Object
  • Object
show all
Defined in:
lib/merger.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Merger

Returns a new instance of Merger.



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# File 'lib/merger.rb', line 2

def initialize
  @filename1          = ENV["filename1"]
  @filename2          = ENV["filename2"]
  @output_filename    = ENV["output_filename"]
  @sort_column        = ENV["sort_column"].to_i
  @sort_as_int        = ENV["sort_as_int"] == "true"
  @column_separator   = ENV["column_separator"]
end

Instance Method Details

#get_line(stream, parse_cols = true) ⇒ Object 



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# File 'lib/merger.rb', line 43

def get_line(stream, parse_cols = true)
  line = stream.gets
  return [nil, nil] if line.nil?
  return [line, nil] unless parse_cols
  cols = line.chomp.split(@column_separator, @sort_column + 2)
  cols[@sort_column] = cols[@sort_column].to_i if @sort_as_int
  return [line, cols[@sort_column]]
end

#merge! ⇒ Object 



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# File 'lib/merger.rb', line 11

def merge!
  outfile = File.open(@output_filename, "w")
  f1 = File.open(@filename1)
  f2 = File.open(@filename2)

  f1_line, f1_col = self.get_line(f1)
  f2_line, f2_col = self.get_line(f2)
  while !f1_line.nil? and !f2_line.nil?
    if f1_col < f2_col
      outfile.print f1_line
      f1_line, f1_col = self.get_line(f1)
    else
      outfile.print f2_line
      f2_line, f2_col = self.get_line(f2)
    end
  end

  while !f1_line.nil?
    outfile.print f1_line
    f1_line, f1_col = self.get_line(f1, false)
  end

  while !f2_line.nil?
    outfile.print f2_line
    f2_line, f2_col = self.get_line(f2, false)
  end

  f1.close
  f2.close
  outfile.close
end