Access members of case class

Question

I have a case class defined in a scala companion object.

case class ResponseSuccess(resp: SMPPSubmitSMResp)

Which I send to an akka-actor (Java)

if(res.isRight) sender ! Backend.ResponseSuccess(sms.resp)

It is received like this, but I don't know how to extract the SMPPSubmitSMResp from the ResponseSuccess

} else if (msg instanceof Backend.ResponseSuccess) {
        SMPPSubmitSMResp packet = (SMPPSubmitSMResp) msg;
        someFunc(packet);
}

the error I get (i.e. the message is received) is:

Backend$ResponseSuccess cannot be cast to SMPPSubmitSMResp

You can do `msg.resp` to get the `SMPPSubmitSMResp` inside the `ResponseSuccess`. — Peter Neyens, Sep 25 '15 at 12:46
error: cannot find symbol [error] SMPPSubmitSMResp packet = (SMPPSubmitSMResp) msg.resp; [error] ^ [error] symbol: variable resp [error] location: variable msg of type Object — FelixHJ, Sep 25 '15 at 12:48

Rinat Tainov · Answer 1 · 2015-09-25T13:41:30.297

3

If you use Scala, good approach to use Scala Pattern Matching:

msg match {
  case ResponseSuccess(resp) => // do something
  case _ => // do something else
}

If you want use Java, you will get a lot of cases where you have to cast objects especially for akka, so you can implement some utility for yourself. Something like this

edited Sep 25 '15 at 13:41

answered Sep 25 '15 at 12:56

Rinat Tainov

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The OP is asking how to do it in Java. – Rex Kerr Sep 25 '15 at 13:22
The main program is in Java, some of the modules that are added/changed are being (re)done in scala. We prefer Scala, but cannot just rewrite everything. – FelixHJ Sep 25 '15 at 17:06

Access members of case class

1 Answers1