Question

I meet some scala code with “?” but do not know what it mean in scala, could anyone explain it to me ? Thanks.

And here’s one example

 def getJobId(conf: Configuration): String =
    ?(conf.get("scoobi.jobid")).getOrElse(sys.error("Scoobi job id not set."))

Answer 1

For me it looks like the apply method of Option. Is there somewhere the following import statement in the code:

import Option.{apply => ?}

This means apply is imported as ?. From the doc of Option.apply:

An Option factory which creates Some(x) if the argument is not null,
and None if it is null.

The whole statement means then:

if conf.get(“scoobi.jobid”) is not equal null, assign this string,
otherwise assign the string sys.error(“Scoobi job id not set.”)
returns