First pass aggregator

aggregator.rb

class Aggregator
  def initialize(target_filename, output_filename, pattern, output_file_type=nil)
    @target_filename  = target_filename
    @output_filename  = output_filename
    @pattern          = pattern
    @output_file_type = output_file_type || "csv"
  end

  def run
    open_files
    parse_files
    close_files
  end

  private

  def open_files
    @target = File.open(@target_filename, "r")
    @output = File.open(@output_filename, "r+")
  end

  def close_files
    @target.close
    @output.close
  end

  def parse_files
    @target.each do |line|
      if line =~ @pattern
        @output.puts line
      end
    end
  end

end