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CompositeException.scala
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CompositeException.scala
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/*
* Copyright (c) 2017-2019 The Typelevel Cats-effect Project Developers
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package cats.effect.util
import cats.data.NonEmptyList
/** A composite exception represents a list of exceptions
* caught from evaluating multiple independent actions
* and that need to be signaled together.
*
* Note the constructor doesn't allow wrapping anything less
* than two throwable references.
*
* Use [[cats.effect.util.CompositeException.apply apply]]
* for building composite exceptions.
*/
final class CompositeException(val head: Throwable, val tail: NonEmptyList[Throwable])
extends RuntimeException(
s"Multiple exceptions were thrown (${1 + tail.size}), " +
s"first ${head.getClass.getName}: ${head.getMessage}")
with Serializable {
/** Returns the set of all errors wrapped by this composite. */
def all: NonEmptyList[Throwable] =
head :: tail
}
object CompositeException {
/** Simple builder for [[CompositeException]]. */
def apply(first: Throwable, second: Throwable, rest: List[Throwable] = Nil): CompositeException =
new CompositeException(first, NonEmptyList(second, rest))
/** For easy pattern matching a `CompositeException`. */
def unapplySeq(ref: CompositeException): Option[Seq[Throwable]] =
Some(ref.head :: ref.tail.toList)
}