1 /*
   2  * Copyright (c) 2008, 2009, 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.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     protected 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 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 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 }