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/*
* Copyright (c) 2007 through 2024 David Berkman
*
* This file is part of the SmallMind Code Project.
*
* The SmallMind Code Project is free software, you can redistribute
* it and/or modify it under either, at your discretion...
*
* 1) The terms of GNU Affero General Public License as published by the
* Free Software Foundation, either version 3 of the License, or (at
* your option) any later version.
*
* ...or...
*
* 2) The terms of the Apache License, Version 2.0.
*
* The SmallMind Code Project 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 or Apache License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* and the Apache License along with the SmallMind Code Project. If not, see
* .
*
* Additional permission under the GNU Affero GPL version 3 section 7
* ------------------------------------------------------------------
* If you modify this Program, or any covered work, by linking or
* combining it with other code, such other code is not for that reason
* alone subject to any of the requirements of the GNU Affero GPL
* version 3.
*/
package org.smallmind.file.ephemeral;
import java.io.IOException;
import java.net.URI;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.AccessMode;
import java.nio.file.CopyOption;
import java.nio.file.DirectoryStream;
import java.nio.file.FileAlreadyExistsException;
import java.nio.file.FileStore;
import java.nio.file.FileSystem;
import java.nio.file.FileSystemAlreadyExistsException;
import java.nio.file.LinkOption;
import java.nio.file.NoSuchFileException;
import java.nio.file.NotDirectoryException;
import java.nio.file.OpenOption;
import java.nio.file.Path;
import java.nio.file.ProviderMismatchException;
import java.nio.file.SecureDirectoryStream;
import java.nio.file.StandardOpenOption;
import java.nio.file.attribute.BasicFileAttributes;
import java.nio.file.attribute.FileAttribute;
import java.nio.file.attribute.FileAttributeView;
import java.nio.file.spi.FileSystemProvider;
import java.util.Map;
import java.util.Set;
/*
-Djava.nio.file.spi.DefaultFileSystemProvider=org.smallmind.file.ephemeral.EphemeralFileSystemProvider
-Dorg.smallmind.file.ephemeral.configuration.capacity=
-Dorg.smallmind.file.ephemeral.configuration.blockSize=<1024>
-Dorg.smallmind.file.ephemeral.configuration.roots=/overlay/file/system,/any/other/path
*/
public class EphemeralFileSystemProvider extends FileSystemProvider {
private final EphemeralFileSystem ephemeralFileSystem;
private final String scheme;
private FileSystem nativeFileSystem;
public EphemeralFileSystemProvider () {
this("ephemeral");
}
public EphemeralFileSystemProvider (FileSystemProvider fileSystemProvider) {
this(fileSystemProvider.getScheme());
nativeFileSystem = fileSystemProvider.getFileSystem(URI.create(fileSystemProvider.getScheme() + ":///"));
}
public EphemeralFileSystemProvider (String scheme) {
this.scheme = scheme;
ephemeralFileSystem = new EphemeralFileSystem(this, new EphemeralFileSystemConfiguration());
}
public boolean isDefault () {
return "file".equals(scheme);
}
@Override
public String getScheme () {
return scheme;
}
public FileSystem getNativeFileSystem () {
return nativeFileSystem;
}
@Override
public FileSystem newFileSystem (URI uri, Map env) {
EphemeralURIUtility.checkUri(scheme, uri);
throw new FileSystemAlreadyExistsException();
}
@Override
public FileSystem getFileSystem (URI uri) {
EphemeralURIUtility.checkUri(scheme, uri);
return ephemeralFileSystem;
}
@Override
public Path getPath (URI uri) {
return EphemeralURIUtility.fromUri(ephemeralFileSystem, uri);
}
@Override
public synchronized SeekableByteChannel newByteChannel (Path path, Set options, FileAttribute... attrs)
throws IOException {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
if (options.contains(StandardOpenOption.WRITE) || options.contains(StandardOpenOption.APPEND)) {
try {
internalCheckAccess(normalizedPath, AccessMode.WRITE);
} catch (NoSuchFileException noSuchFileException) {
if (normalizedPath.getNames().length > 0) {
internalCheckAccess(normalizedPath.getParent(), AccessMode.WRITE);
}
}
} else {
internalCheckAccess(normalizedPath, AccessMode.READ);
}
return ((EphemeralFileSystem)normalizedPath.getFileSystem()).getFileStore().newByteChannel(normalizedPath, options, attrs);
}
}
@Override
public synchronized DirectoryStream newDirectoryStream (Path dir, DirectoryStream.Filter filter)
throws NoSuchFileException, NotDirectoryException {
return newDirectoryStream(dir, filter, new LinkOption[0]);
}
public synchronized SecureDirectoryStream newDirectoryStream (Path dir, DirectoryStream.Filter filter, LinkOption... options)
throws NoSuchFileException, NotDirectoryException {
if (!EphemeralFileSystem.class.isAssignableFrom(dir.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + dir + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedDir = (EphemeralPath)dir.normalize();
internalCheckAccess(normalizedDir, AccessMode.READ);
return ((EphemeralFileSystem)normalizedDir.getFileSystem()).getFileStore().newDirectoryStream(normalizedDir, filter);
}
}
@Override
public synchronized void createDirectory (Path dir, FileAttribute... attrs)
throws NoSuchFileException, FileAlreadyExistsException {
if (!EphemeralFileSystem.class.isAssignableFrom(dir.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + dir + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedDir = (EphemeralPath)dir.normalize();
if (normalizedDir.getNames().length > 0) {
internalCheckAccess(normalizedDir.getParent(), AccessMode.WRITE);
}
((EphemeralFileSystem)normalizedDir.getFileSystem()).getFileStore().createDirectory(normalizedDir, attrs);
}
}
@Override
public synchronized void delete (Path path)
throws IOException {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
internalCheckAccess(normalizedPath, AccessMode.WRITE);
((EphemeralFileSystem)normalizedPath.getFileSystem()).getFileStore().delete(normalizedPath);
}
}
@Override
public synchronized void copy (Path source, Path target, CopyOption... options)
throws IOException {
if (!EphemeralFileSystem.class.isAssignableFrom(source.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + source + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else if (!EphemeralFileSystem.class.isAssignableFrom(target.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + target + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedSource = (EphemeralPath)source.normalize();
EphemeralPath normalizedTarget = (EphemeralPath)target.normalize();
internalCheckAccess(normalizedSource, AccessMode.READ);
internalCheckAccess(normalizedTarget, AccessMode.WRITE);
((EphemeralFileSystem)normalizedSource.getFileSystem()).getFileStore().copy(normalizedSource, normalizedTarget, options);
}
}
@Override
public synchronized void move (Path source, Path target, CopyOption... options)
throws IOException {
if (!EphemeralFileSystem.class.isAssignableFrom(source.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + source + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else if (!EphemeralFileSystem.class.isAssignableFrom(target.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + target + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedSource = (EphemeralPath)source.normalize();
EphemeralPath normalizedTarget = (EphemeralPath)target.normalize();
internalCheckAccess(normalizedSource, AccessMode.READ);
internalCheckAccess(normalizedTarget, AccessMode.WRITE);
((EphemeralFileSystem)source.getFileSystem()).getFileStore().move(normalizedSource, normalizedTarget, options);
}
}
@Override
public synchronized boolean isSameFile (Path source, Path target)
throws NoSuchFileException {
if (!EphemeralFileSystem.class.isAssignableFrom(source.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + source + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else if (!EphemeralFileSystem.class.isAssignableFrom(target.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + target + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedSource = (EphemeralPath)source.normalize();
EphemeralPath normalizedTarget = (EphemeralPath)target.normalize();
internalCheckAccess(normalizedSource, AccessMode.READ);
internalCheckAccess(normalizedTarget, AccessMode.READ);
return normalizedSource.equals(normalizedTarget);
}
}
@Override
public boolean isHidden (Path path) {
return false;
}
@Override
public FileStore getFileStore (Path path) {
return path.getFileSystem().getFileStores().iterator().next();
}
@Override
public synchronized void checkAccess (Path path, AccessMode... modes)
throws NoSuchFileException {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
internalCheckAccess(normalizedPath, modes);
}
}
private void internalCheckAccess (EphemeralPath path, AccessMode... modes)
throws NoSuchFileException {
((EphemeralFileSystem)path.getFileSystem()).getFileStore().checkAccess(path);
}
@Override
public synchronized V getFileAttributeView (Path path, Class type, LinkOption... options) {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
try {
internalCheckAccess(normalizedPath, AccessMode.READ);
return ((EphemeralFileSystem)normalizedPath.getFileSystem()).getFileStore().getFileAttributeView(normalizedPath, type, options);
} catch (NoSuchFileException noSuchFileException) {
return null;
}
}
}
@Override
public synchronized A readAttributes (Path path, Class type, LinkOption... options)
throws NoSuchFileException {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
internalCheckAccess(normalizedPath, AccessMode.READ);
return ((EphemeralFileSystem)normalizedPath.getFileSystem()).getFileStore().readAttributes(normalizedPath, type, options);
}
}
@Override
public synchronized Map readAttributes (Path path, String attributes, LinkOption... options)
throws NoSuchFileException {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
internalCheckAccess(normalizedPath, AccessMode.READ);
return ((EphemeralFileSystem)normalizedPath.getFileSystem()).getFileStore().readAttributes(normalizedPath, attributes, options);
}
}
@Override
public synchronized void setAttribute (Path path, String attribute, Object value, LinkOption... options)
throws NoSuchFileException {
if (!EphemeralFileSystem.class.isAssignableFrom(path.getFileSystem().getClass())) {
throw new ProviderMismatchException("The path(" + path + ") is not associated with the " + EphemeralFileSystem.class.getSimpleName());
} else {
EphemeralPath normalizedPath = (EphemeralPath)path.normalize();
internalCheckAccess(normalizedPath, AccessMode.WRITE);
((EphemeralFileSystem)normalizedPath.getFileSystem()).getFileStore().setAttribute(normalizedPath, attribute, value, options);
}
}
}