1 /*
   2  * Copyright (c) 2008, 2015, 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 
  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 
  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         if (errno() == UnixConstants.ELOOP)
  90             return new FileSystemException(file, other, errorString()
  91                 + " or unable to access attributes of symbolic link");
  92 
  93         // fallback to the more general exception
  94         return new FileSystemException(file, other, errorString());
  95     }
  96 
  97     void rethrowAsIOException(String file) throws IOException {
  98         IOException x = translateToIOException(file, null);
  99         throw x;
 100     }
 101 
 102     void rethrowAsIOException(UnixPath file, UnixPath other) throws IOException {
 103         String a = (file == null) ? null : file.getPathForExceptionMessage();
 104         String b = (other == null) ? null : other.getPathForExceptionMessage();
 105         IOException x = translateToIOException(a, b);
 106         throw x;
 107     }
 108 
 109     void rethrowAsIOException(UnixPath file) throws IOException {
 110         rethrowAsIOException(file, null);
 111     }
 112 
 113     IOException asIOException(UnixPath file) {
 114         return translateToIOException(file.getPathForExceptionMessage(), null);
 115     }
 116 }