/*
 * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation. Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
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");
 }
}