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  1. case class Connection()
  2. case class Request(method: String)
  3. case class Response(/* body: OutputStream */)
  4.  
  5. trait Handler {
  6.   def handle(connection: Connection, request: Request): Response
  7. }
  8.  
  9. trait HEADHandler extends Handler {
  10.   abstract override def handle(connection: Connection, request: Request): Response = {
  11.     val nonHEADRequest =
  12.       if (request.method == "HEAD") request.copy(method = "GET"/*, body = NullOutputStream.NULL_OUTPUT_STREAM*/)
  13.       else request
  14.     super.handle(connection, nonHEADRequest)
  15.   }
  16. }
  17.  
  18. class MyHandler extends Handler {
  19.   override def handle(connection: Connection, request: Request): Response = {
  20.     println(request)
  21.     Response()
  22.   }
  23. }
  24.  
  25. object Main extends App {
  26.   val handler = new MyHandler with HEADHandler
  27.   handler.handle(Connection(), Request("GET"))
  28.   handler.handle(Connection(), Request("HEAD"))
  29.   handler.handle(Connection(), Request("PUT"))
  30.   handler.handle(Connection(), Request("POST"))
  31.   handler.handle(Connection(), Request("DELETE"))
  32. }
  33.  
Success #stdin #stdout 0.38s 382080KB
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Standard input is empty
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Request(GET)
Request(GET)
Request(PUT)
Request(POST)
Request(DELETE)
https://ideone.com/PddGX1
language:
Scala (scala 2.12.8)
created:
9 years ago
visibility:
public

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