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The AWS SDK for Java with support for OSGi. The AWS SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * 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;

import com.amazonaws.AbortedException;
import com.amazonaws.AmazonClientException;

/**
 * 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 {@link #failure(Throwable)}, but the given errmsg will be used if
     * it was wrapped as either an {@link AmazonClientException} or
     * {@link AbortedException}.
     */
    public static RuntimeException failure(Throwable t, String errmsg) {
        if (t instanceof RuntimeException)
            return (RuntimeException)t;
        if (t instanceof Error)
            throw (Error)t;
        return t instanceof InterruptedException 
             ? new AbortedException(errmsg, t)
             : new AmazonClientException(errmsg, t);
    }
}