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
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
26package sun.nio.fs;
27
28import java.nio.file.*;
29import java.io.IOException;
30
31/**
32 * Internal exception thrown by native methods when error detected.
33 */
34
35class UnixException extends Exception {
36    static final long serialVersionUID = 7227016794320723218L;
37
38    private int errno;
39    private String msg;
40
41    UnixException(int errno) {
42        this.errno = errno;
43        this.msg = null;
44    }
45
46    UnixException(String msg) {
47        this.errno = 0;
48        this.msg = msg;
49    }
50
51    int errno() {
52        return errno;
53    }
54
55    void setError(int errno) {
56        this.errno = errno;
57        this.msg = null;
58    }
59
60    String errorString() {
61        if (msg != null) {
62            return msg;
63        } else {
64            return Util.toString(UnixNativeDispatcher.strerror(errno()));
65        }
66    }
67
68    @Override
69    public String getMessage() {
70        return errorString();
71    }
72
73    @Override
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     */
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
103    void rethrowAsIOException(String file) throws IOException {
104        IOException x = translateToIOException(file, null);
105        throw x;
106    }
107
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
115    void rethrowAsIOException(UnixPath file) throws IOException {
116        rethrowAsIOException(file, null);
117    }
118
119    IOException asIOException(UnixPath file) {
120        return translateToIOException(file.getPathForExceptionMessage(), null);
121    }
122}
123