Convert XML to Flat File

XmlToFlatFile.groovy

def xmlToFlatFile(xml, tag, mapping) {
  def flatFile = new StringBuffer()
  xml[tag].each { row ->
    mapping.each { col ->
      col.closure.delegate = [(tag): row]
      def result = col.closure() ?: ''
      flatFile << result
        .trim() 
        .padRight(col.length)
        .substring(0, col.length)
    }
    flatFile << System.getProperty('line.separator')
  }
  flatFile.toString()
}