1/*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements.  See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License.  You may obtain a copy of the License at
8 *
9 *    http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18package org.apache.spark.util
19
20/**
21 * Extractor Object for pulling out the root cause of an error.
22 * If the error contains no cause, it will return the error itself.
23 *
24 * Usage:
25 * try {
26 *   ...
27 * } catch {
28 *   case CausedBy(ex: CommitDeniedException) => ...
29 * }
30 */
31private[spark] object CausedBy {
32
33  def unapply(e: Throwable): Option[Throwable] = {
34    Option(e.getCause).flatMap(cause => unapply(cause)).orElse(Some(e))
35  }
36}
37