Java example source code file (WindowsFileSystemProvider.java)
The WindowsFileSystemProvider.java Java example source code/*
* Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package sun.nio.fs;
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.nio.channels.*;
import java.net.URI;
import java.util.concurrent.ExecutorService;
import java.io.*;
import java.util.*;
import java.security.AccessController;
import sun.misc.Unsafe;
import sun.nio.ch.ThreadPool;
import sun.security.util.SecurityConstants;
import static sun.nio.fs.WindowsNativeDispatcher.*;
import static sun.nio.fs.WindowsSecurity.*;
import static sun.nio.fs.WindowsConstants.*;
public class WindowsFileSystemProvider
extends AbstractFileSystemProvider
{
private static final Unsafe unsafe = Unsafe.getUnsafe();
private static final String USER_DIR = "user.dir";
private final WindowsFileSystem theFileSystem;
public WindowsFileSystemProvider() {
theFileSystem = new WindowsFileSystem(this, System.getProperty(USER_DIR));
}
@Override
public String getScheme() {
return "file";
}
private void checkUri(URI uri) {
if (!uri.getScheme().equalsIgnoreCase(getScheme()))
throw new IllegalArgumentException("URI does not match this provider");
if (uri.getAuthority() != null)
throw new IllegalArgumentException("Authority component present");
if (uri.getPath() == null)
throw new IllegalArgumentException("Path component is undefined");
if (!uri.getPath().equals("/"))
throw new IllegalArgumentException("Path component should be '/'");
if (uri.getQuery() != null)
throw new IllegalArgumentException("Query component present");
if (uri.getFragment() != null)
throw new IllegalArgumentException("Fragment component present");
}
@Override
public FileSystem newFileSystem(URI uri, Map<String,?> env)
throws IOException
{
checkUri(uri);
throw new FileSystemAlreadyExistsException();
}
@Override
public final FileSystem getFileSystem(URI uri) {
checkUri(uri);
return theFileSystem;
}
@Override
public Path getPath(URI uri) {
return WindowsUriSupport.fromUri(theFileSystem, uri);
}
@Override
public FileChannel newFileChannel(Path path,
Set<? extends OpenOption> options,
FileAttribute<?>... attrs)
throws IOException
{
if (path == null)
throw new NullPointerException();
if (!(path instanceof WindowsPath))
throw new ProviderMismatchException();
WindowsPath file = (WindowsPath)path;
WindowsSecurityDescriptor sd = WindowsSecurityDescriptor.fromAttribute(attrs);
try {
return WindowsChannelFactory
.newFileChannel(file.getPathForWin32Calls(),
file.getPathForPermissionCheck(),
options,
sd.address());
} catch (WindowsException x) {
x.rethrowAsIOException(file);
return null;
} finally {
if (sd != null)
sd.release();
}
}
@Override
public AsynchronousFileChannel newAsynchronousFileChannel(Path path,
Set<? extends OpenOption> options,
ExecutorService executor,
FileAttribute<?>... attrs)
throws IOException
{
if (path == null)
throw new NullPointerException();
if (!(path instanceof WindowsPath))
throw new ProviderMismatchException();
WindowsPath file = (WindowsPath)path;
ThreadPool pool = (executor == null) ? null : ThreadPool.wrap(executor, 0);
WindowsSecurityDescriptor sd =
WindowsSecurityDescriptor.fromAttribute(attrs);
try {
return WindowsChannelFactory
.newAsynchronousFileChannel(file.getPathForWin32Calls(),
file.getPathForPermissionCheck(),
options,
sd.address(),
pool);
} catch (WindowsException x) {
x.rethrowAsIOException(file);
return null;
} finally {
if (sd != null)
sd.release();
}
}
@Override
@SuppressWarnings("unchecked")
public <V extends FileAttributeView> V
getFileAttributeView(Path obj, Class<V> view, LinkOption... options)
{
WindowsPath file = WindowsPath.toWindowsPath(obj);
if (view == null)
throw new NullPointerException();
boolean followLinks = Util.followLinks(options);
if (view == BasicFileAttributeView.class)
return (V) WindowsFileAttributeViews.createBasicView(file, followLinks);
if (view == DosFileAttributeView.class)
return (V) WindowsFileAttributeViews.createDosView(file, followLinks);
if (view == AclFileAttributeView.class)
return (V) new WindowsAclFileAttributeView(file, followLinks);
if (view == FileOwnerAttributeView.class)
return (V) new FileOwnerAttributeViewImpl(
new WindowsAclFileAttributeView(file, followLinks));
if (view == UserDefinedFileAttributeView.class)
return (V) new WindowsUserDefinedFileAttributeView(file, followLinks);
return (V) null;
}
@Override
@SuppressWarnings("unchecked")
public <A extends BasicFileAttributes> A readAttributes(Path file,
Class<A> type,
LinkOption... options)
throws IOException
{
Class<? extends BasicFileAttributeView> view;
if (type == BasicFileAttributes.class)
view = BasicFileAttributeView.class;
else if (type == DosFileAttributes.class)
view = DosFileAttributeView.class;
else if (type == null)
throw new NullPointerException();
else
throw new UnsupportedOperationException();
return (A) getFileAttributeView(file, view, options).readAttributes();
}
@Override
public DynamicFileAttributeView getFileAttributeView(Path obj, String name, LinkOption... options) {
WindowsPath file = WindowsPath.toWindowsPath(obj);
boolean followLinks = Util.followLinks(options);
if (name.equals("basic"))
return WindowsFileAttributeViews.createBasicView(file, followLinks);
if (name.equals("dos"))
return WindowsFileAttributeViews.createDosView(file, followLinks);
if (name.equals("acl"))
return new WindowsAclFileAttributeView(file, followLinks);
if (name.equals("owner"))
return new FileOwnerAttributeViewImpl(
new WindowsAclFileAttributeView(file, followLinks));
if (name.equals("user"))
return new WindowsUserDefinedFileAttributeView(file, followLinks);
return null;
}
@Override
public SeekableByteChannel newByteChannel(Path obj,
Set<? extends OpenOption> options,
FileAttribute<?>... attrs)
throws IOException
{
WindowsPath file = WindowsPath.toWindowsPath(obj);
WindowsSecurityDescriptor sd =
WindowsSecurityDescriptor.fromAttribute(attrs);
try {
return WindowsChannelFactory
.newFileChannel(file.getPathForWin32Calls(),
file.getPathForPermissionCheck(),
options,
sd.address());
} catch (WindowsException x) {
x.rethrowAsIOException(file);
return null; // keep compiler happy
} finally {
sd.release();
}
}
@Override
boolean implDelete(Path obj, boolean failIfNotExists) throws IOException {
WindowsPath file = WindowsPath.toWindowsPath(obj);
file.checkDelete();
WindowsFileAttributes attrs = null;
try {
// need to know if file is a directory or junction
attrs = WindowsFileAttributes.get(file, false);
if (attrs.isDirectory() || attrs.isDirectoryLink()) {
RemoveDirectory(file.getPathForWin32Calls());
} else {
DeleteFile(file.getPathForWin32Calls());
}
return true;
} catch (WindowsException x) {
// no-op if file does not exist
if (!failIfNotExists &&
(x.lastError() == ERROR_FILE_NOT_FOUND ||
x.lastError() == ERROR_PATH_NOT_FOUND)) return false;
if (attrs != null && attrs.isDirectory()) {
// ERROR_ALREADY_EXISTS is returned when attempting to delete
// non-empty directory on SAMBA servers.
if (x.lastError() == ERROR_DIR_NOT_EMPTY ||
x.lastError() == ERROR_ALREADY_EXISTS)
{
throw new DirectoryNotEmptyException(
file.getPathForExceptionMessage());
}
}
x.rethrowAsIOException(file);
return false;
}
}
@Override
public void copy(Path source, Path target, CopyOption... options)
throws IOException
{
WindowsFileCopy.copy(WindowsPath.toWindowsPath(source),
WindowsPath.toWindowsPath(target),
options);
}
@Override
public void move(Path source, Path target, CopyOption... options)
throws IOException
{
WindowsFileCopy.move(WindowsPath.toWindowsPath(source),
WindowsPath.toWindowsPath(target),
options);
}
/**
* Checks the file security against desired access.
*/
private static boolean hasDesiredAccess(WindowsPath file, int rights) throws IOException {
// read security descriptor containing ACL (symlinks are followed)
boolean hasRights = false;
String target = WindowsLinkSupport.getFinalPath(file, true);
NativeBuffer aclBuffer = WindowsAclFileAttributeView
.getFileSecurity(target,
DACL_SECURITY_INFORMATION
| OWNER_SECURITY_INFORMATION
| GROUP_SECURITY_INFORMATION);
try {
hasRights = checkAccessMask(aclBuffer.address(), rights,
FILE_GENERIC_READ,
FILE_GENERIC_WRITE,
FILE_GENERIC_EXECUTE,
FILE_ALL_ACCESS);
} catch (WindowsException exc) {
exc.rethrowAsIOException(file);
} finally {
aclBuffer.release();
}
return hasRights;
}
/**
* Checks if the given file(or directory) exists and is readable.
*/
private void checkReadAccess(WindowsPath file) throws IOException {
try {
Set<OpenOption> opts = Collections.emptySet();
FileChannel fc = WindowsChannelFactory
.newFileChannel(file.getPathForWin32Calls(),
file.getPathForPermissionCheck(),
opts,
0L);
fc.close();
} catch (WindowsException exc) {
// Windows errors are very inconsistent when the file is a directory
// (ERROR_PATH_NOT_FOUND returned for root directories for example)
// so we retry by attempting to open it as a directory.
try {
new WindowsDirectoryStream(file, null).close();
} catch (IOException ioe) {
// translate and throw original exception
exc.rethrowAsIOException(file);
}
}
}
@Override
public void checkAccess(Path obj, AccessMode... modes) throws IOException {
WindowsPath file = WindowsPath.toWindowsPath(obj);
boolean r = false;
boolean w = false;
boolean x = false;
for (AccessMode mode: modes) {
switch (mode) {
case READ : r = true; break;
case WRITE : w = true; break;
case EXECUTE : x = true; break;
default: throw new AssertionError("Should not get here");
}
}
// special-case read access to avoid needing to determine effective
// access to file; default if modes not specified
if (!w && !x) {
checkReadAccess(file);
return;
}
int mask = 0;
if (r) {
file.checkRead();
mask |= FILE_READ_DATA;
}
if (w) {
file.checkWrite();
mask |= FILE_WRITE_DATA;
}
if (x) {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkExec(file.getPathForPermissionCheck());
mask |= FILE_EXECUTE;
}
if (!hasDesiredAccess(file, mask))
throw new AccessDeniedException(
file.getPathForExceptionMessage(), null,
"Permissions does not allow requested access");
// for write access we neeed to check if the DOS readonly attribute
// and if the volume is read-only
if (w) {
try {
WindowsFileAttributes attrs = WindowsFileAttributes.get(file, true);
if (!attrs.isDirectory() && attrs.isReadOnly())
throw new AccessDeniedException(
file.getPathForExceptionMessage(), null,
"DOS readonly attribute is set");
} catch (WindowsException exc) {
exc.rethrowAsIOException(file);
}
if (WindowsFileStore.create(file).isReadOnly()) {
throw new AccessDeniedException(
file.getPathForExceptionMessage(), null, "Read-only file system");
}
}
}
@Override
public boolean isSameFile(Path obj1, Path obj2) throws IOException {
WindowsPath file1 = WindowsPath.toWindowsPath(obj1);
if (file1.equals(obj2))
return true;
if (obj2 == null)
throw new NullPointerException();
if (!(obj2 instanceof WindowsPath))
return false;
WindowsPath file2 = (WindowsPath)obj2;
// check security manager access to both files
file1.checkRead();
file2.checkRead();
// open both files and see if they are the same
long h1 = 0L;
try {
h1 = file1.openForReadAttributeAccess(true);
} catch (WindowsException x) {
x.rethrowAsIOException(file1);
}
try {
WindowsFileAttributes attrs1 = null;
try {
attrs1 = WindowsFileAttributes.readAttributes(h1);
} catch (WindowsException x) {
x.rethrowAsIOException(file1);
}
long h2 = 0L;
try {
h2 = file2.openForReadAttributeAccess(true);
} catch (WindowsException x) {
x.rethrowAsIOException(file2);
}
try {
WindowsFileAttributes attrs2 = null;
try {
attrs2 = WindowsFileAttributes.readAttributes(h2);
} catch (WindowsException x) {
x.rethrowAsIOException(file2);
}
return WindowsFileAttributes.isSameFile(attrs1, attrs2);
} finally {
CloseHandle(h2);
}
} finally {
CloseHandle(h1);
}
}
@Override
public boolean isHidden(Path obj) throws IOException {
WindowsPath file = WindowsPath.toWindowsPath(obj);
file.checkRead();
WindowsFileAttributes attrs = null;
try {
attrs = WindowsFileAttributes.get(file, true);
} catch (WindowsException x) {
x.rethrowAsIOException(file);
}
// DOS hidden attribute not meaningful when set on directories
if (attrs.isDirectory())
return false;
return attrs.isHidden();
}
@Override
public FileStore getFileStore(Path obj) throws IOException {
WindowsPath file = WindowsPath.toWindowsPath(obj);
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new RuntimePermission("getFileStoreAttributes"));
file.checkRead();
}
return WindowsFileStore.create(file);
}
@Override
public void createDirectory(Path obj, FileAttribute<?>... attrs)
throws IOException
{
WindowsPath dir = WindowsPath.toWindowsPath(obj);
dir.checkWrite();
WindowsSecurityDescriptor sd = WindowsSecurityDescriptor.fromAttribute(attrs);
try {
CreateDirectory(dir.getPathForWin32Calls(), sd.address());
} catch (WindowsException x) {
x.rethrowAsIOException(dir);
} finally {
sd.release();
}
}
@Override
public DirectoryStream<Path> newDirectoryStream(Path obj, DirectoryStream.Filter filter)
throws IOException
{
WindowsPath dir = WindowsPath.toWindowsPath(obj);
dir.checkRead();
if (filter == null)
throw new NullPointerException();
return new WindowsDirectoryStream(dir, filter);
}
@Override
public void createSymbolicLink(Path obj1, Path obj2, FileAttribute<?>... attrs)
throws IOException
{
WindowsPath link = WindowsPath.toWindowsPath(obj1);
WindowsPath target = WindowsPath.toWindowsPath(obj2);
if (!link.getFileSystem().supportsLinks()) {
throw new UnsupportedOperationException("Symbolic links not supported "
+ "on this operating system");
}
// no attributes allowed
if (attrs.length > 0) {
WindowsSecurityDescriptor.fromAttribute(attrs); // may throw NPE or UOE
throw new UnsupportedOperationException("Initial file attributes" +
"not supported when creating symbolic link");
}
// permission check
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new LinkPermission("symbolic"));
link.checkWrite();
}
/**
* Throw I/O exception for the drive-relative case because Windows
* creates a link with the resolved target for this case.
*/
if (target.type() == WindowsPathType.DRIVE_RELATIVE) {
throw new IOException("Cannot create symbolic link to working directory relative target");
}
/*
* Windows treates symbolic links to directories differently than it
* does to other file types. For that reason we need to check if the
* target is a directory (or a directory junction).
*/
WindowsPath resolvedTarget;
if (target.type() == WindowsPathType.RELATIVE) {
WindowsPath parent = link.getParent();
resolvedTarget = (parent == null) ? target : parent.resolve(target);
} else {
resolvedTarget = link.resolve(target);
}
int flags = 0;
try {
WindowsFileAttributes wattrs = WindowsFileAttributes.get(resolvedTarget, false);
if (wattrs.isDirectory() || wattrs.isDirectoryLink())
flags |= SYMBOLIC_LINK_FLAG_DIRECTORY;
} catch (WindowsException x) {
// unable to access target so assume target is not a directory
}
// create the link
try {
CreateSymbolicLink(link.getPathForWin32Calls(),
WindowsPath.addPrefixIfNeeded(target.toString()),
flags);
} catch (WindowsException x) {
if (x.lastError() == ERROR_INVALID_REPARSE_DATA) {
x.rethrowAsIOException(link, target);
} else {
x.rethrowAsIOException(link);
}
}
}
@Override
public void createLink(Path obj1, Path obj2) throws IOException {
WindowsPath link = WindowsPath.toWindowsPath(obj1);
WindowsPath existing = WindowsPath.toWindowsPath(obj2);
// permission check
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
sm.checkPermission(new LinkPermission("hard"));
link.checkWrite();
existing.checkWrite();
}
// create hard link
try {
CreateHardLink(link.getPathForWin32Calls(),
existing.getPathForWin32Calls());
} catch (WindowsException x) {
x.rethrowAsIOException(link, existing);
}
}
@Override
public Path readSymbolicLink(Path obj1) throws IOException {
WindowsPath link = WindowsPath.toWindowsPath(obj1);
WindowsFileSystem fs = link.getFileSystem();
if (!fs.supportsLinks()) {
throw new UnsupportedOperationException("symbolic links not supported");
}
// permission check
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
FilePermission perm = new FilePermission(link.getPathForPermissionCheck(),
SecurityConstants.FILE_READLINK_ACTION);
sm.checkPermission(perm);
}
String target = WindowsLinkSupport.readLink(link);
return WindowsPath.createFromNormalizedPath(fs, target);
}
}
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