Advanced Search

Return to Snippet

Revision: 12367
at March 12, 2009 10:59 by narkisr
Initial Code 
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
}
Initial URL 

                                

                                                            

                                    

                                        

                                        Initial Description
                                        

                                    

                                    
A nice example of utilizing Groovy closures in order to create a when statement in Groovy (http://www.transentia.com.au/flatpress/?x=entry:entry090311-222726).

                                

                                                            

                                    

                                        

                                        Initial Title
                                        

                                    

                                    
Creating when construct in Groovy using closures

                                

                                                            

                                    

                                        

                                        Initial Tags
                                        

                                    

                                    
groovy

                                

                                                            

                                    

                                        

                                        Initial Language
                                        

                                    

                                    
Groovy