CODEWITHSUNDEEP
scalapattern-matching
Josh
Josh

Reputation: 875

Matching multiple exception types to the same case

When pattern matching an exception with a case statement, is there a more simplified way of matching the same exception to a set of exception types? Instead of this:

} catch {
  case e if e.isInstanceOf[MappingException] || e.isInstanceOf[ParseException] =>

Something like this would be nice:

case e: MappingException | ParseException | SomeOtherException =>

Is something like this possible?

Upvotes: 21

Views: 6921

Answers (1)

Ben James
Ben James

Reputation: 125167

You can do this:

catch {
  case e @ (_: MappingException | _: ParseException | _: SomeOtherException) =>
}

If you're trying to save some lines of code and you handle the same types of exceptions regularly, you might consider defining a partial function beforehand to use as a handler:

val myHandler: PartialFunction[Throwable, Unit] = {
  case e @ (_: MappingException | _: ParseException | _: SomeOtherException) =>
}

try {
  throw new MappingException("argh!")
} catch myHandler

Upvotes: 52

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