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 /*
  * Copyright 2013-2015 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;
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;
    }

    
Used to help perform common throw-up with minimal wrapping.
    public static RuntimeException failure(Throwable t) {
        if (t instanceof RuntimeException)
            return (RuntimeException)t;
        if (t instanceof Error)
            throw (Error)t;
        return t instanceof InterruptedException
             ? new AbortedException(t)
             : new AmazonClientException(t);
    }

    
Same as failure(java.lang.Throwable), but the given errmsg will be used if it was wrapped as either an com.amazonaws.AmazonClientException or com.amazonaws.AbortedException.
    public static RuntimeException failure(Throwable tString errmsg) {
        if (t instanceof RuntimeException)
            return (RuntimeException)t;
        if (t instanceof Error)
            throw (Error)t;
        return t instanceof InterruptedException 
             ? new AbortedException(errmsgt)
             : new AmazonClientException(errmsgt);
    }
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