gistfile1.scala

/**
 * A RouteInfo generated by a RegexRoute. We hold the matcher that was used to verify the match
 * so that we can capture the groups. We also lug along the paramNames list. We lazily evaluate
 * param names as this is probably cheaper/faster than building a map of names->values up front.
 */
class RegexRouteInfo(val matcher: Matcher, val paramNames: List[String]) extends RouteInfo {
  def param(name: String): String = {
    val idx = paramNames.findIndexOf(_ == name)
    if (idx > -1 && idx < matcher.groupCount) matcher.group(idx + 1) else throw new IllegalArgumentException("bad paramName: " + name)
  }
}