1 /*
2  * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 package java.io;
26 
27 import java.util.Objects;
28 
29 /**
30  * Wraps an {@link IOException} with an unchecked exception.
31  *
32  * @since   1.8
33  */
34 public class UncheckedIOException extends RuntimeException {
35     private static final long serialVersionUID = -8134305061645241065L;
36 
37     /**
38      * Constructs an instance of this class.
39      *
40      * @param   message
41      *          the detail message, can be null
42      * @param   cause
43      *          the {@code IOException}
44      *
45      * @throws  NullPointerException
46      *          if the cause is {@code null}
47      */
UncheckedIOException(String message, IOException cause)48     public UncheckedIOException(String message, IOException cause) {
49         super(message, Objects.requireNonNull(cause));
50     }
51 
52     /**
53      * Constructs an instance of this class.
54      *
55      * @param   cause
56      *          the {@code IOException}
57      *
58      * @throws  NullPointerException
59      *          if the cause is {@code null}
60      */
UncheckedIOException(IOException cause)61     public UncheckedIOException(IOException cause) {
62         super(Objects.requireNonNull(cause));
63     }
64 
65     /**
66      * Returns the cause of this exception.
67      *
68      * @return  the {@code IOException} which is the cause of this exception.
69      */
70     @Override
getCause()71     public IOException getCause() {
72         return (IOException) super.getCause();
73     }
74 
75     /**
76      * Called to read the object from a stream.
77      *
78      * @throws  InvalidObjectException
79      *          if the object is invalid or has a cause that is not
80      *          an {@code IOException}
81      */
readObject(ObjectInputStream s)82     private void readObject(ObjectInputStream s)
83         throws IOException, ClassNotFoundException
84     {
85         s.defaultReadObject();
86         Throwable cause = super.getCause();
87         if (!(cause instanceof IOException))
88             throw new InvalidObjectException("Cause must be an IOException");
89     }
90 }
91