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.nio.file.attribute.*;

    30 import java.nio.file.spi.FileSystemProvider;

    31 import java.nio.channels.*;

    32 import java.net.URI;

    33 import java.util.concurrent.ExecutorService;

    34 import java.io.IOException;

    35 import java.util.*;

    36 

    37 import sun.nio.ch.ThreadPool;

    38 

    39 /**

    40  * Base implementation of FileSystemProvider

    41  */

    42 

    43 public abstract class UnixFileSystemProvider

    44     extends FileSystemProvider

    45 {

    46     private static final String USER_DIR = "user.dir";

    47     private final UnixFileSystem theFileSystem;

    48 

    49     public UnixFileSystemProvider() {

    50         String userDir = System.getProperty(USER_DIR);

    51         theFileSystem = newFileSystem(userDir);

    52     }

    53 

    54     /**

    55      * Constructs a new file system using the given default directory.

    56      */

    57     abstract UnixFileSystem newFileSystem(String dir);

    58 

    59     @Override

    60     public final String getScheme() {

    61         return "file";

    62     }

    63 

    64     private void checkUri(URI uri) {

    65         if (!uri.getScheme().equalsIgnoreCase(getScheme()))

    66             throw new IllegalArgumentException("URI does not match this provider");

    67         if (uri.getAuthority() != null)

    68             throw new IllegalArgumentException("Authority component present");

    69         if (uri.getPath() == null)

    70             throw new IllegalArgumentException("Path component is undefined");

    71         if (!uri.getPath().equals("/"))

    72             throw new IllegalArgumentException("Path component should be '/'");

    73         if (uri.getQuery() != null)

    74             throw new IllegalArgumentException("Query component present");

    75         if (uri.getFragment() != null)

    76             throw new IllegalArgumentException("Fragment component present");

    77     }

    78 

    79     @Override

    80     public final FileSystem newFileSystem(URI uri, Map<String,?> env) {

    81         checkUri(uri);

    82         throw new FileSystemAlreadyExistsException();

    83     }

    84 

    85     @Override

    86     public final FileSystem getFileSystem(URI uri) {

    87         checkUri(uri);

    88         return theFileSystem;

    89     }

    90 

    91     @Override

    92     public Path getPath(URI uri) {

    93         return UnixUriUtils.fromUri(theFileSystem, uri);

    94     }

    95 

    96     private UnixPath checkPath(Path obj) {

    97         if (obj == null)

    98             throw new NullPointerException();

    99         if (!(obj instanceof UnixPath))

   100             throw new ProviderMismatchException();

   101         return (UnixPath)obj;

   102     }

   103 

   104     @Override

   105     public final FileChannel newFileChannel(Path obj,

   106                                             Set<? extends OpenOption> options,

   107                                             FileAttribute<?>... attrs)

   108         throws IOException

   109     {

   110         UnixPath file = checkPath(obj);

   111         int mode = UnixFileModeAttribute

   112             .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);

   113         try {

   114             return UnixChannelFactory.newFileChannel(file, options, mode);

   115         } catch (UnixException x) {

   116             x.rethrowAsIOException(file);

   117             return null;

   118         }

   119     }

   120 

   121     @Override

   122     public final AsynchronousFileChannel newAsynchronousFileChannel(Path obj,

   123                                                                     Set<? extends OpenOption> options,

   124                                                                     ExecutorService executor,

   125                                                                     FileAttribute<?>... attrs) throws IOException

   126     {

   127         UnixPath file = checkPath(obj);

   128         int mode = UnixFileModeAttribute

   129             .toUnixMode(UnixFileModeAttribute.ALL_READWRITE, attrs);

   130         ThreadPool pool = (executor == null) ? null : ThreadPool.wrap(executor, 0);

   131         try {

   132             return UnixChannelFactory

   133                 .newAsynchronousFileChannel(file, options, mode, pool);

   134         } catch (UnixException x) {

   135             x.rethrowAsIOException(file);

   136             return null;

   137         }

   138     }

   139 }