compiling jasper subreports, gem jasper-rails

gistfile1.rb

def self.compile_subreports(jasper_file)
  sub_reports_path = Dir.new File.dirname(jasper_file)
  load_jrxml_files = sub_reports_path.entries.select { |entry| File.extname(entry) == ".jrxml" }

  load_jrxml_files.each do |subreport_jrxml_file|
    subreport_jasper_file = "#{File.basename(subreport_jrxml_file, '.jrxml')}.jasper"
    file_exists = !File.exist?(subreport_jasper_file) || (File.exist?(subreport_jrxml_file)
    file_outdated = File.mtime(subreport_jrxml_file) > File.mtime(subreport_jasper_file))
    if file_exists && file_outdated
      JasperCompileManager.compileReportToFile(subreport_jrxml_file, subreport_jasper_file) 
    end
  end
end