1 /*

     2  * Copyright 2008-2009 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any 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 new String(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.getPathForExecptionMessage();

   101         String b = (other == null) ? null : other.getPathForExecptionMessage();

   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.getPathForExecptionMessage(), null);

   112     }

   113 }