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CompositeFailure.scala
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CompositeFailure.scala
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/*
* Copyright (c) 2013 Functional Streams for Scala
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package fs2
import cats.data.NonEmptyList
/** Represents multiple (>1) exceptions were thrown. */
case class CompositeFailure(
head: Throwable,
tail: NonEmptyList[Throwable]
) extends Throwable(
s"Multiple exceptions were thrown (${1 + tail.size}), first ${head.getClass.getName}: ${head.getMessage}",
head
) {
/** Gets all causes (guaranteed to have at least 2 elements). */
def all: NonEmptyList[Throwable] = head :: tail
}
object CompositeFailure {
def apply(
first: Throwable,
second: Throwable,
rest: List[Throwable] = List.empty
): CompositeFailure =
apply(first, NonEmptyList(second, rest))
def apply(first: Throwable, rest: NonEmptyList[Throwable]): CompositeFailure = {
def flattenExceptions(throwable: Throwable): NonEmptyList[Throwable] =
throwable match {
case cf: CompositeFailure => cf.all
case throwable => NonEmptyList.one(throwable)
}
first match {
case cf: CompositeFailure =>
val tail = cf.tail ::: rest.flatMap(flattenExceptions)
new CompositeFailure(cf.head, tail)
case _ =>
new CompositeFailure(first, rest.flatMap(flattenExceptions))
}
}
def fromNel(errors: NonEmptyList[Throwable]): Throwable =
errors match {
case NonEmptyList(hd, Nil) => hd
case NonEmptyList(first, second :: rest) => apply(first, second, rest)
}
def fromList(errors: List[Throwable]): Option[Throwable] =
errors match {
case Nil => None
case hd :: Nil => Some(hd)
case first :: second :: rest => Some(apply(first, second, rest))
}
/** Builds composite failure from the results supplied.
*
* - When any of the results are on left, then the Left(err) is returned
* - When both results fail, the Left(CompositeFailure(_)) is returned
* - When both results succeeds then Right(()) is returned
*/
def fromResults(
first: Either[Throwable, Unit],
second: Either[Throwable, Unit]
): Either[Throwable, Unit] =
first match {
case Right(_) => second
case Left(err) =>
Left(second.fold(err1 => apply(err, err1, Nil), _ => err))
}
}