1 /*
2  * Copyright (c) 2008, 2016, 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
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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 
26 package sun.nio.fs;
27 
28 import java.nio.file.*;
29 import java.io.IOException;
30 
31 /**
32  * Internal exception thrown by native methods when error detected.
33  */
34 
35 class UnixException extends Exception {
36     static final long serialVersionUID = 7227016794320723218L;
37 
38     private int errno;
39     private String msg;
40 
UnixException(int errno)41     UnixException(int errno) {
42         this.errno = errno;
43         this.msg = null;
44     }
45 
UnixException(String msg)46     UnixException(String msg) {
47         this.errno = 0;
48         this.msg = msg;
49     }
50 
errno()51     int errno() {
52         return errno;
53     }
54 
setError(int errno)55     void setError(int errno) {
56         this.errno = errno;
57         this.msg = null;
58     }
59 
errorString()60     String errorString() {
61         if (msg != null) {
62             return msg;
63         } else {
64             return Util.toString(UnixNativeDispatcher.strerror(errno()));
65         }
66     }
67 
68     @Override
getMessage()69     public String getMessage() {
70         return errorString();
71     }
72 
73     @Override
fillInStackTrace()74     public Throwable fillInStackTrace() {
75         // This is an internal exception; the stack trace is irrelevant.
76         return this;
77     }
78 
79     /**
80      * Map well known errors to specific exceptions where possible; otherwise
81      * return more general FileSystemException.
82      */
translateToIOException(String file, String other)83     private IOException translateToIOException(String file, String other) {
84         // created with message rather than errno
85         if (msg != null)
86             return new IOException(msg);
87 
88         // handle specific cases
89         if (errno() == UnixConstants.EACCES)
90             return new AccessDeniedException(file, other, null);
91         if (errno() == UnixConstants.ENOENT)
92             return new NoSuchFileException(file, other, null);
93         if (errno() == UnixConstants.EEXIST)
94             return new FileAlreadyExistsException(file, other, null);
95         if (errno() == UnixConstants.ELOOP)
96             return new FileSystemException(file, other, errorString()
97                 + " or unable to access attributes of symbolic link");
98 
99         // fallback to the more general exception
100         return new FileSystemException(file, other, errorString());
101     }
102 
rethrowAsIOException(String file)103     void rethrowAsIOException(String file) throws IOException {
104         IOException x = translateToIOException(file, null);
105         throw x;
106     }
107 
rethrowAsIOException(UnixPath file, UnixPath other)108     void rethrowAsIOException(UnixPath file, UnixPath other) throws IOException {
109         String a = (file == null) ? null : file.getPathForExceptionMessage();
110         String b = (other == null) ? null : other.getPathForExceptionMessage();
111         IOException x = translateToIOException(a, b);
112         throw x;
113     }
114 
rethrowAsIOException(UnixPath file)115     void rethrowAsIOException(UnixPath file) throws IOException {
116         rethrowAsIOException(file, null);
117     }
118 
asIOException(UnixPath file)119     IOException asIOException(UnixPath file) {
120         return translateToIOException(file.getPathForExceptionMessage(), null);
121     }
122 }
123