/*
* Copyright 2013-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License").
* You may not use this file except in compliance with the License.
* A copy of the License is located at
*
* http://aws.amazon.com/apache2.0
*
* or in the "license" file accompanying this file. This file 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 com.amazonaws.util;
import org.apache.commons.logging.LogFactory;
/**
* Utility for use with errors or exceptions.
*/
public enum Throwables {
;
/**
* Returns the root cause of the given throwable, or null if the given
* throwable is null. If the root cause is over 1000 level deep, the
* original throwable will be returned defensively as this is heuristically
* considered a circular reference, however unlikely.
*/
public static Throwable getRootCause(Throwable orig) {
if (orig == null)
return orig;
Throwable t = orig;
// defend against (malicious?) circularity
for (int i = 0; i < 1000; i++) {
Throwable cause = t.getCause();
if (cause == null)
return t;
t = cause;
}
// Too bad. Return the original exception.
LogFactory.getLog(Throwables.class).debug(
"Possible circular reference detected on " + orig.getClass()
+ ": [" + orig + "]");
return orig;
}
}