1/*
2 * Copyright (c) 2008, 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
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    /**
74     * Map well known errors to specific exceptions where possible; otherwise
75     * return more general FileSystemException.
76     */
77    private IOException translateToIOException(String file, String other) {
78        // created with message rather than errno
79        if (msg != null)
80            return new IOException(msg);
81
82        // handle specific cases
83        if (errno() == UnixConstants.EACCES)
84            return new AccessDeniedException(file, other, null);
85        if (errno() == UnixConstants.ENOENT)
86            return new NoSuchFileException(file, other, null);
87        if (errno() == UnixConstants.EEXIST)
88            return new FileAlreadyExistsException(file, other, null);
89
90        // fallback to the more general exception
91        return new FileSystemException(file, other, errorString());
92    }
93
94    void rethrowAsIOException(String file) throws IOException {
95        IOException x = translateToIOException(file, null);
96        throw x;
97    }
98
99    void rethrowAsIOException(UnixPath file, UnixPath other) throws IOException {
100        String a = (file == null) ? null : file.getPathForExceptionMessage();
101        String b = (other == null) ? null : other.getPathForExceptionMessage();
102        IOException x = translateToIOException(a, b);
103        throw x;
104    }
105
106    void rethrowAsIOException(UnixPath file) throws IOException {
107        rethrowAsIOException(file, null);
108    }
109
110    IOException asIOException(UnixPath file) {
111        return translateToIOException(file.getPathForExceptionMessage(), null);
112    }
113}
114