/**
 * ﻿Copyright 2015-2018 Valery Silaev (http://vsilaev.com)
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:

 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.

 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package net.tascalate.async.core;

import java.util.concurrent.CompletionException;
import java.util.concurrent.ExecutionException;

final class Exceptions {
    private Exceptions() {}
    
    @SuppressWarnings("unchecked")
    static <T, E extends Throwable> T sneakyThrow(Throwable ex) throws E {
        throw (E)ex;
    }
    
    static Throwable unrollExecutionException(Throwable ex) {
        Throwable nested = ex;
        while (nested instanceof ExecutionException) {
            nested = nested.getCause();
        }
        return null == nested ? ex : nested;
    }
    
    static Throwable unrollCompletionException(Throwable ex) {
        Throwable nested = ex;
        while (nested instanceof CompletionException) {
            nested = nested.getCause();
        }
        return null == nested ? ex : nested;
    }
    
}
