/*
* Copyright (c) 2010, 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.
*
* 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
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
import java.nio.file.*;
import java.nio.file.attribute.*;
import java.nio.file.spi.FileSystemProvider;
import java.nio.channels.SeekableByteChannel;
import java.net.URI;
import java.util.*;
import java.io.*;
/**
* A "pass through" file system implementation that passes through, or delegates,
* everything to the default file system.
*/
class PassThroughFileSystem extends FileSystem {
private final FileSystemProvider provider;
private final FileSystem delegate;
PassThroughFileSystem(FileSystemProvider provider, FileSystem delegate) {
this.provider = provider;
this.delegate = delegate;
}
/**
* Creates a new "pass through" file system. Useful for test environments
* where the provider might not be deployed.
*/
static FileSystem create() throws IOException {
FileSystemProvider provider = new PassThroughProvider();
Map<String,?> env = Collections.emptyMap();
URI uri = URI.create("pass:///");
return provider.newFileSystem(uri, env);
}
static Path unwrap(Path wrapper) {
if (wrapper == null)
throw new NullPointerException();
if (!(wrapper instanceof PassThroughPath))
throw new ProviderMismatchException();
return ((PassThroughPath)wrapper).delegate;
}
@Override
public FileSystemProvider provider() {
return provider;
}
@Override
public void close() throws IOException {
delegate.close();
}
@Override
public boolean isOpen() {
return delegate.isOpen();
}
@Override
public boolean isReadOnly() {
return delegate.isReadOnly();
}
@Override
public String getSeparator() {
return delegate.getSeparator();
}
@Override
public Iterable<Path> getRootDirectories() {
final Iterable<Path> roots = delegate.getRootDirectories();
return new Iterable<Path>() {
@Override
public Iterator<Path> iterator() {
final Iterator<Path> itr = roots.iterator();
return new Iterator<Path>() {
@Override
public boolean hasNext() {
return itr.hasNext();
}
@Override
public Path next() {
return new PassThroughPath(delegate, itr.next());
}
@Override
public void remove() {
itr.remove();
}
};
}
};
}
@Override
public Iterable<FileStore> getFileStores() {
// assume that unwrapped objects aren't exposed
return delegate.getFileStores();
}
@Override
public Set<String> supportedFileAttributeViews() {
// assume that unwrapped objects aren't exposed
return delegate.supportedFileAttributeViews();
}
@Override
public Path getPath(String first, String... more) {
return new PassThroughPath(this, delegate.getPath(first, more));
}
@Override
public PathMatcher getPathMatcher(String syntaxAndPattern) {
final PathMatcher matcher = delegate.getPathMatcher(syntaxAndPattern);
return new PathMatcher() {
@Override
public boolean matches(Path path) {
return matcher.matches(unwrap(path));
}
};
}
@Override
public UserPrincipalLookupService getUserPrincipalLookupService() {
// assume that unwrapped objects aren't exposed
return delegate.getUserPrincipalLookupService();
}
@Override
public WatchService newWatchService() throws IOException {
// to keep it simple
throw new UnsupportedOperationException();
}
static class PassThroughProvider extends FileSystemProvider {
private static final String SCHEME = "pass";
private static volatile PassThroughFileSystem delegate;
public PassThroughProvider() { }
@Override
public String getScheme() {
return SCHEME;
}
private void checkScheme(URI uri) {
if (!uri.getScheme().equalsIgnoreCase(SCHEME))
throw new IllegalArgumentException();
}
private void checkUri(URI uri) {
checkScheme(uri);
if (!uri.getSchemeSpecificPart().equals("///"))
throw new IllegalArgumentException();
}
@Override
public FileSystem newFileSystem(URI uri, Map<String,?> env)
throws IOException
{
checkUri(uri);
synchronized (PassThroughProvider.class) {
if (delegate != null)
throw new FileSystemAlreadyExistsException();
PassThroughFileSystem result =
new PassThroughFileSystem(this, FileSystems.getDefault());
delegate = result;
return result;
}
}
@Override
public FileSystem getFileSystem(URI uri) {
checkUri(uri);
FileSystem result = delegate;
if (result == null)
throw new FileSystemNotFoundException();
return result;
}
@Override
public Path getPath(URI uri) {
checkScheme(uri);
if (delegate == null)
throw new FileSystemNotFoundException();
uri = URI.create(delegate.provider().getScheme() + ":" +
uri.getSchemeSpecificPart());
return new PassThroughPath(delegate, delegate.provider().getPath(uri));
}
@Override
public void setAttribute(Path file, String attribute, Object value, LinkOption... options)
throws IOException
{
Files.setAttribute(unwrap(file), attribute, value, options);
}
@Override
public Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options)
throws IOException
{
return Files.readAttributes(unwrap(file), attributes, options);
}
@Override
public <V extends FileAttributeView> V getFileAttributeView(Path file,
Class<V> type,
LinkOption... options)
{
return Files.getFileAttributeView(unwrap(file), type, options);
}
@Override
public <A extends BasicFileAttributes> A readAttributes(Path file,
Class<A> type,
LinkOption... options)
throws IOException
{
return Files.readAttributes(unwrap(file), type, options);
}
@Override
public void delete(Path file) throws IOException {
Files.delete(unwrap(file));
}
@Override
public void createSymbolicLink(Path link, Path target, FileAttribute<?>... attrs)
throws IOException
{
Files.createSymbolicLink(unwrap(link), unwrap(target), attrs);
}
@Override
public void createLink(Path link, Path existing) throws IOException {
Files.createLink(unwrap(link), unwrap(existing));
}
@Override
public Path readSymbolicLink(Path link) throws IOException {
Path target = Files.readSymbolicLink(unwrap(link));
return new PassThroughPath(delegate, target);
}
@Override
public void copy(Path source, Path target, CopyOption... options) throws IOException {
Files.copy(unwrap(source), unwrap(target), options);
}
@Override
public void move(Path source, Path target, CopyOption... options) throws IOException {
Files.move(unwrap(source), unwrap(target), options);
}
private DirectoryStream<Path> wrap(final DirectoryStream<Path> stream) {
return new DirectoryStream<Path>() {
@Override
public Iterator<Path> iterator() {
final Iterator<Path> itr = stream.iterator();
return new Iterator<Path>() {
@Override
public boolean hasNext() {
return itr.hasNext();
}
@Override
public Path next() {
return new PassThroughPath(delegate, itr.next());
}
@Override
public void remove() {
itr.remove();
}
};
}
@Override
public void close() throws IOException {
stream.close();
}
};
}
@Override
public DirectoryStream<Path> newDirectoryStream(Path dir, DirectoryStream.Filter<? super Path> filter)
throws IOException
{
return wrap(Files.newDirectoryStream(unwrap(dir), filter));
}
@Override
public void createDirectory(Path dir, FileAttribute<?>... attrs)
throws IOException
{
Files.createDirectory(unwrap(dir), attrs);
}
@Override
public SeekableByteChannel newByteChannel(Path file,
Set<? extends OpenOption> options,
FileAttribute<?>... attrs)
throws IOException
{
return Files.newByteChannel(unwrap(file), options, attrs);
}
@Override
public boolean isHidden(Path file) throws IOException {
return Files.isHidden(unwrap(file));
}
@Override
public FileStore getFileStore(Path file) throws IOException {
return Files.getFileStore(unwrap(file));
}
@Override
public boolean isSameFile(Path file, Path other) throws IOException {
return Files.isSameFile(unwrap(file), unwrap(other));
}
@Override
public void checkAccess(Path file, AccessMode... modes)
throws IOException
{
// hack
if (modes.length == 0) {
if (Files.exists(unwrap(file)))
return;
else
throw new NoSuchFileException(file.toString());
}
throw new RuntimeException("not implemented yet");
}
}
static class PassThroughPath implements Path {
private final FileSystem fs;
private final Path delegate;
PassThroughPath(FileSystem fs, Path delegate) {
this.fs = fs;
this.delegate = delegate;
}
private Path wrap(Path path) {
return (path != null) ? new PassThroughPath(fs, path) : null;
}
@Override
public FileSystem getFileSystem() {
return fs;
}
@Override
public boolean isAbsolute() {
return delegate.isAbsolute();
}
@Override
public Path getRoot() {
return wrap(delegate.getRoot());
}
@Override
public Path getParent() {
return wrap(delegate.getParent());
}
@Override
public int getNameCount() {
return delegate.getNameCount();
}
@Override
public Path getFileName() {
return wrap(delegate.getFileName());
}
@Override
public Path getName(int index) {
return wrap(delegate.getName(index));
}
@Override
public Path subpath(int beginIndex, int endIndex) {
return wrap(delegate.subpath(beginIndex, endIndex));
}
@Override
public boolean startsWith(Path other) {
return delegate.startsWith(unwrap(other));
}
@Override
public boolean startsWith(String other) {
return delegate.startsWith(other);
}
@Override
public boolean endsWith(Path other) {
return delegate.endsWith(unwrap(other));
}
@Override
public boolean endsWith(String other) {
return delegate.endsWith(other);
}
@Override
public Path normalize() {
return wrap(delegate.normalize());
}
@Override
public Path resolve(Path other) {
return wrap(delegate.resolve(unwrap(other)));
}
@Override
public Path resolve(String other) {
return wrap(delegate.resolve(other));
}
@Override
public Path resolveSibling(Path other) {
return wrap(delegate.resolveSibling(unwrap(other)));
}
@Override
public Path resolveSibling(String other) {
return wrap(delegate.resolveSibling(other));
}
@Override
public Path relativize(Path other) {
return wrap(delegate.relativize(unwrap(other)));
}
@Override
public boolean equals(Object other) {
if (!(other instanceof PassThroughPath))
return false;
return delegate.equals(unwrap((PassThroughPath)other));
}
@Override
public int hashCode() {
return delegate.hashCode();
}
@Override
public String toString() {
return delegate.toString();
}
@Override
public URI toUri() {
String ssp = delegate.toUri().getSchemeSpecificPart();
return URI.create(fs.provider().getScheme() + ":" + ssp);
}
@Override
public Path toAbsolutePath() {
return wrap(delegate.toAbsolutePath());
}
@Override
public Path toRealPath(LinkOption... options) throws IOException {
return wrap(delegate.toRealPath(options));
}
@Override
public File toFile() {
return delegate.toFile();
}
@Override
public Iterator<Path> iterator() {
final Iterator<Path> itr = delegate.iterator();
return new Iterator<Path>() {
@Override
public boolean hasNext() {
return itr.hasNext();
}
@Override
public Path next() {
return wrap(itr.next());
}
@Override
public void remove() {
itr.remove();
}
};
}
@Override
public int compareTo(Path other) {
return delegate.compareTo(unwrap(other));
}
@Override
public WatchKey register(WatchService watcher,
WatchEvent.Kind<?>[] events,
WatchEvent.Modifier... modifiers)
{
throw new UnsupportedOperationException();
}
@Override
public WatchKey register(WatchService watcher,
WatchEvent.Kind<?>... events)
{
throw new UnsupportedOperationException();
}
}
}