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 }