Creating when construct in Groovy using closures

def car = "Patriot"
 
def manufacturer = match(car) {
  when "Focus",     "Ford"
  when "Navigator", "Lincoln"
  when "Camry",     "Toyota"
  when "Civic",     "Honda"
  when "Patriot",   "Jeep"
  when "Jetta",     "VW"
  when "Ceyene",    "Porsche"
  when "Outback",   "Subaru"
  when "520i",      "BMW"
  when "Tundra",    "Nissan"
  otherwise         "Unknown"
}
 
println "The $car is made by $manufacturer"
 
def match(obj, closure) {
    closure.subject = obj
    closure.when = { value, result ->
        if (value == subject)
            throw new MatchResultException(result: result)
    }
    closure.otherwise = { return it }
    closure.resolveStrategy = Closure.DELEGATE_FIRST
    try {
        closure()
        closure.otherwise()
    } catch (MatchResultException r) {
        r.result
    }
}
 
class MatchResultException extends RuntimeException {
    def result
}