/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
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 */
package java.io;

import java.util.Objects;

/**
 * Wraps an {@link IOException} with an unchecked exception.
 *
 * @since 1.8
 */
public class UncheckedIOException extends RuntimeException {
 private static final long serialVersionUID = -8134305061645241065L;

 /**
 * Constructs an instance of this class.
 *
 * @param message
 * the detail message, can be null
 * @param cause
 * the {@code IOException}
 *
 * @throws NullPointerException
 * if the cause is {@code null}
 */
 public UncheckedIOException(String message, IOException cause) {
 super(message, Objects.requireNonNull(cause));
 }

 /**
 * Constructs an instance of this class.
 *
 * @param cause
 * the {@code IOException}
 *
 * @throws NullPointerException
 * if the cause is {@code null}
 */
 public UncheckedIOException(IOException cause) {
 super(Objects.requireNonNull(cause));
 }

 /**
 * Returns the cause of this exception.
 *
 * @return the {@code IOException} which is the cause of this exception.
 */
 @Override
 public IOException getCause() {
 return (IOException) super.getCause();
 }

 /**
 * Called to read the object from a stream.
 *
 * @throws InvalidObjectException
 * if the object is invalid or has a cause that is not
 * an {@code IOException}
 */
 private void readObject(ObjectInputStream s)
 throws IOException, ClassNotFoundException
 {
 s.defaultReadObject();
 Throwable cause = super.getCause();
 if (!(cause instanceof IOException))
 throw new InvalidObjectException("Cause must be an IOException");
 }
}