MoviesParser.scala

package com.alternegro
import java.util.Date
import java.util.Calendar
import java.util.GregorianCalendar
import scala.xml._
import scala.collection.JavaConversions._

object MoviesParser extends App {
  case class CastMember(role: String, firstName: String, lastName: String)
  case class Movie(title: String, description: String, rating: String, cast:List[CastMember]=Nil)
  val identity = {x:String => x}
  
  def createMovie(node: Node) = {
    val tokenArray = Array(("title", identity), ("desc", identity), ("rating", identity), ("cast", identity)).map(t => nodeText(node, t._1, t._2))
    Movie(tokenArray(0), tokenArray(1), tokenArray(2))
  }

  def nodeText(p: Node, key:String, valueTransformer:String => String): String = {
    try { 
      valueTransformer(Option((p \\ key).head.text).getOrElse("missing"))
    } catch {
      case e: Exception => "missing"
    }
  }

  def extractMovies(xml:scala.xml.Elem) = {    
    (xml \\ "program").filter { _ \\ "@ratingsBody" exists (_.text == "Motion Picture Association of America") }.map(createMovie(_))
  }

  val moviesXml = scala.xml.XML.loadFile(args.head)
  val movies = extractMovies(moviesXml)
  println(movies.size, movies.last.title, movies.last.description, movies.last.rating, movies.last.cast)
  for( ln <- io.Source.stdin.getLines ) println( ln )
}