538 lines
16 KiB
Java
538 lines
16 KiB
Java
/*
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* Copyright (c) 2010, 2013, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.nio.file.*;
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import java.nio.file.attribute.*;
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import java.nio.file.spi.FileSystemProvider;
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import java.nio.channels.SeekableByteChannel;
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import java.net.URI;
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import java.util.*;
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import java.io.*;
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/**
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* A "pass through" file system implementation that passes through, or delegates,
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* everything to the default file system.
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*/
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class PassThroughFileSystem extends FileSystem {
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private final FileSystemProvider provider;
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private final FileSystem delegate;
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PassThroughFileSystem(FileSystemProvider provider, FileSystem delegate) {
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this.provider = provider;
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this.delegate = delegate;
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}
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/**
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* Creates a new "pass through" file system. Useful for test environments
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* where the provider might not be deployed.
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*/
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static FileSystem create() throws IOException {
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FileSystemProvider provider = new PassThroughProvider();
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Map<String,?> env = Collections.emptyMap();
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URI uri = URI.create("pass:///");
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return provider.newFileSystem(uri, env);
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}
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static Path unwrap(Path wrapper) {
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if (wrapper == null)
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throw new NullPointerException();
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if (!(wrapper instanceof PassThroughPath))
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throw new ProviderMismatchException();
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return ((PassThroughPath)wrapper).delegate;
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}
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@Override
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public FileSystemProvider provider() {
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return provider;
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}
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@Override
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public void close() throws IOException {
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delegate.close();
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}
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@Override
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public boolean isOpen() {
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return delegate.isOpen();
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}
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@Override
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public boolean isReadOnly() {
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return delegate.isReadOnly();
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}
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@Override
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public String getSeparator() {
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return delegate.getSeparator();
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}
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@Override
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public Iterable<Path> getRootDirectories() {
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final Iterable<Path> roots = delegate.getRootDirectories();
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return new Iterable<Path>() {
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@Override
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public Iterator<Path> iterator() {
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final Iterator<Path> itr = roots.iterator();
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return new Iterator<Path>() {
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@Override
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public boolean hasNext() {
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return itr.hasNext();
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}
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@Override
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public Path next() {
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return new PassThroughPath(delegate, itr.next());
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}
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@Override
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public void remove() {
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itr.remove();
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}
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};
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}
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};
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}
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@Override
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public Iterable<FileStore> getFileStores() {
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// assume that unwrapped objects aren't exposed
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return delegate.getFileStores();
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}
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@Override
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public Set<String> supportedFileAttributeViews() {
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// assume that unwrapped objects aren't exposed
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return delegate.supportedFileAttributeViews();
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}
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@Override
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public Path getPath(String first, String... more) {
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return new PassThroughPath(this, delegate.getPath(first, more));
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}
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@Override
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public PathMatcher getPathMatcher(String syntaxAndPattern) {
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final PathMatcher matcher = delegate.getPathMatcher(syntaxAndPattern);
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return new PathMatcher() {
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@Override
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public boolean matches(Path path) {
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return matcher.matches(unwrap(path));
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}
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};
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}
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@Override
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public UserPrincipalLookupService getUserPrincipalLookupService() {
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// assume that unwrapped objects aren't exposed
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return delegate.getUserPrincipalLookupService();
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}
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@Override
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public WatchService newWatchService() throws IOException {
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// to keep it simple
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throw new UnsupportedOperationException();
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}
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static class PassThroughProvider extends FileSystemProvider {
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private static final String SCHEME = "pass";
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private static volatile PassThroughFileSystem delegate;
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public PassThroughProvider() { }
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@Override
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public String getScheme() {
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return SCHEME;
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}
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private void checkScheme(URI uri) {
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if (!uri.getScheme().equalsIgnoreCase(SCHEME))
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throw new IllegalArgumentException();
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}
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private void checkUri(URI uri) {
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checkScheme(uri);
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if (!uri.getSchemeSpecificPart().equals("///"))
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throw new IllegalArgumentException();
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}
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@Override
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public FileSystem newFileSystem(URI uri, Map<String,?> env)
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throws IOException
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{
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checkUri(uri);
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synchronized (PassThroughProvider.class) {
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if (delegate != null)
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throw new FileSystemAlreadyExistsException();
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PassThroughFileSystem result =
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new PassThroughFileSystem(this, FileSystems.getDefault());
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delegate = result;
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return result;
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}
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}
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@Override
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public FileSystem getFileSystem(URI uri) {
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checkUri(uri);
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FileSystem result = delegate;
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if (result == null)
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throw new FileSystemNotFoundException();
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return result;
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}
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@Override
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public Path getPath(URI uri) {
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checkScheme(uri);
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if (delegate == null)
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throw new FileSystemNotFoundException();
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uri = URI.create(delegate.provider().getScheme() + ":" +
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uri.getSchemeSpecificPart());
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return new PassThroughPath(delegate, delegate.provider().getPath(uri));
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}
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@Override
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public void setAttribute(Path file, String attribute, Object value, LinkOption... options)
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throws IOException
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{
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Files.setAttribute(unwrap(file), attribute, value, options);
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}
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@Override
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public Map<String,Object> readAttributes(Path file, String attributes, LinkOption... options)
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throws IOException
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{
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return Files.readAttributes(unwrap(file), attributes, options);
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}
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@Override
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public <V extends FileAttributeView> V getFileAttributeView(Path file,
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Class<V> type,
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LinkOption... options)
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{
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return Files.getFileAttributeView(unwrap(file), type, options);
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}
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@Override
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public <A extends BasicFileAttributes> A readAttributes(Path file,
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Class<A> type,
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LinkOption... options)
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throws IOException
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{
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return Files.readAttributes(unwrap(file), type, options);
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}
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@Override
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public void delete(Path file) throws IOException {
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Files.delete(unwrap(file));
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}
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@Override
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public void createSymbolicLink(Path link, Path target, FileAttribute<?>... attrs)
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throws IOException
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{
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Files.createSymbolicLink(unwrap(link), unwrap(target), attrs);
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}
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@Override
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public void createLink(Path link, Path existing) throws IOException {
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Files.createLink(unwrap(link), unwrap(existing));
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}
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@Override
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public Path readSymbolicLink(Path link) throws IOException {
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Path target = Files.readSymbolicLink(unwrap(link));
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return new PassThroughPath(delegate, target);
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}
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@Override
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public void copy(Path source, Path target, CopyOption... options) throws IOException {
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Files.copy(unwrap(source), unwrap(target), options);
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}
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@Override
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public void move(Path source, Path target, CopyOption... options) throws IOException {
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Files.move(unwrap(source), unwrap(target), options);
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}
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private DirectoryStream<Path> wrap(final DirectoryStream<Path> stream) {
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return new DirectoryStream<Path>() {
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@Override
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public Iterator<Path> iterator() {
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final Iterator<Path> itr = stream.iterator();
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return new Iterator<Path>() {
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@Override
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public boolean hasNext() {
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return itr.hasNext();
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}
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@Override
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public Path next() {
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return new PassThroughPath(delegate, itr.next());
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}
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@Override
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public void remove() {
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itr.remove();
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}
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};
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}
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@Override
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public void close() throws IOException {
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stream.close();
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}
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};
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}
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@Override
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public DirectoryStream<Path> newDirectoryStream(Path dir, DirectoryStream.Filter<? super Path> filter)
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throws IOException
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{
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return wrap(Files.newDirectoryStream(unwrap(dir), filter));
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}
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@Override
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public void createDirectory(Path dir, FileAttribute<?>... attrs)
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throws IOException
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{
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Files.createDirectory(unwrap(dir), attrs);
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}
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@Override
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public SeekableByteChannel newByteChannel(Path file,
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Set<? extends OpenOption> options,
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FileAttribute<?>... attrs)
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throws IOException
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{
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return Files.newByteChannel(unwrap(file), options, attrs);
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}
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@Override
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public boolean isHidden(Path file) throws IOException {
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return Files.isHidden(unwrap(file));
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}
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@Override
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public FileStore getFileStore(Path file) throws IOException {
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return Files.getFileStore(unwrap(file));
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}
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@Override
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public boolean isSameFile(Path file, Path other) throws IOException {
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return Files.isSameFile(unwrap(file), unwrap(other));
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}
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@Override
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public void checkAccess(Path file, AccessMode... modes)
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throws IOException
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{
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// hack
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if (modes.length == 0) {
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if (Files.exists(unwrap(file)))
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return;
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else
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throw new NoSuchFileException(file.toString());
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}
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throw new RuntimeException("not implemented yet");
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}
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}
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static class PassThroughPath implements Path {
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private final FileSystem fs;
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private final Path delegate;
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PassThroughPath(FileSystem fs, Path delegate) {
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this.fs = fs;
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this.delegate = delegate;
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}
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private Path wrap(Path path) {
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return (path != null) ? new PassThroughPath(fs, path) : null;
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}
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@Override
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public FileSystem getFileSystem() {
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return fs;
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}
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@Override
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public boolean isAbsolute() {
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return delegate.isAbsolute();
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}
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@Override
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public Path getRoot() {
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return wrap(delegate.getRoot());
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}
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@Override
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public Path getParent() {
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return wrap(delegate.getParent());
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}
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@Override
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public int getNameCount() {
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return delegate.getNameCount();
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}
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@Override
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public Path getFileName() {
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return wrap(delegate.getFileName());
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}
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@Override
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public Path getName(int index) {
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return wrap(delegate.getName(index));
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}
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@Override
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public Path subpath(int beginIndex, int endIndex) {
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return wrap(delegate.subpath(beginIndex, endIndex));
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}
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@Override
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public boolean startsWith(Path other) {
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return delegate.startsWith(unwrap(other));
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}
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@Override
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public boolean startsWith(String other) {
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return delegate.startsWith(other);
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}
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@Override
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public boolean endsWith(Path other) {
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return delegate.endsWith(unwrap(other));
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}
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@Override
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public boolean endsWith(String other) {
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return delegate.endsWith(other);
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}
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@Override
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public Path normalize() {
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return wrap(delegate.normalize());
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}
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@Override
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public Path resolve(Path other) {
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return wrap(delegate.resolve(unwrap(other)));
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}
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@Override
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public Path resolve(String other) {
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return wrap(delegate.resolve(other));
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}
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@Override
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public Path resolveSibling(Path other) {
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return wrap(delegate.resolveSibling(unwrap(other)));
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}
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@Override
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public Path resolveSibling(String other) {
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return wrap(delegate.resolveSibling(other));
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}
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@Override
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public Path relativize(Path other) {
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return wrap(delegate.relativize(unwrap(other)));
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}
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@Override
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public boolean equals(Object other) {
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if (!(other instanceof PassThroughPath))
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return false;
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return delegate.equals(unwrap((PassThroughPath)other));
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}
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@Override
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public int hashCode() {
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return delegate.hashCode();
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}
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@Override
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public String toString() {
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return delegate.toString();
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}
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@Override
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public URI toUri() {
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String ssp = delegate.toUri().getSchemeSpecificPart();
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return URI.create(fs.provider().getScheme() + ":" + ssp);
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}
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@Override
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public Path toAbsolutePath() {
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return wrap(delegate.toAbsolutePath());
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}
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@Override
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public Path toRealPath(LinkOption... options) throws IOException {
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return wrap(delegate.toRealPath(options));
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}
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@Override
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public File toFile() {
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return delegate.toFile();
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}
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@Override
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public Iterator<Path> iterator() {
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final Iterator<Path> itr = delegate.iterator();
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return new Iterator<Path>() {
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@Override
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public boolean hasNext() {
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return itr.hasNext();
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}
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@Override
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public Path next() {
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return wrap(itr.next());
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}
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@Override
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public void remove() {
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itr.remove();
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}
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};
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}
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@Override
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public int compareTo(Path other) {
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return delegate.compareTo(unwrap(other));
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}
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@Override
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public WatchKey register(WatchService watcher,
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WatchEvent.Kind<?>[] events,
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WatchEvent.Modifier... modifiers)
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{
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throw new UnsupportedOperationException();
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}
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@Override
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public WatchKey register(WatchService watcher,
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WatchEvent.Kind<?>... events)
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{
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throw new UnsupportedOperationException();
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}
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}
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}
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