UserFileSystemProvider.java

package automately.core.file.nio;

import automately.core.Automately;
import automately.core.data.User;
import io.jsync.app.core.Cluster;
import io.jsync.app.core.Logger;

import java.io.IOException;
import java.net.URI;
import java.nio.channels.FileChannel;
import java.nio.channels.SeekableByteChannel;
import java.nio.file.*;
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;
import java.util.concurrent.ConcurrentHashMap;

public class UserFileSystemProvider extends FileSystemProvider {

    private final static Map<String, UserFileSystemProvider> providers = new ConcurrentHashMap<>();

    public static UserFileSystemProvider create(User user){
        UserFileSystemProvider provider = providers.get(user.token());
        if(provider == null){
            provider = new UserFileSystemProvider(user, Automately.activeInstance().cluster());
            providers.put(user.token(), provider);
        }
        return provider;
    }

    private final Logger logger;
    private UserFileSystem fileSystem = null;

    private Cluster cluster = null;
    private User user = null;

    UserFileSystemProvider(User user, Cluster cluster){
        super();
        this.user = user;
        this.cluster = cluster;
        this.logger = cluster.logger();

        logger.debug("Creating new UserFileSystemProvider for the user " + user.username);
    }

    @Override
    public String getScheme() {
        return "uservfs";
    }

    @Override
    public UserFileSystem newFileSystem(URI uri, Map<String, ?> env) throws IOException {
        if (fileSystem != null) {
            throw new FileSystemAlreadyExistsException(uri.getSchemeSpecificPart());
        }
        fileSystem = new UserFileSystem(this, user, cluster);
        return fileSystem;
    }

    @Override
    public UserFileSystem newFileSystem(Path path, Map<String, ?> env) throws IOException {
        String pathS = path.toString();
        if (fileSystem != null) {
            throw new FileSystemAlreadyExistsException(pathS);
        }
        fileSystem = new UserFileSystem(this, user, cluster);
        return fileSystem;
    }

    @Override
    public UserFileSystem getFileSystem(URI uri) {
        String schemeSpecificPart = uri.getSchemeSpecificPart();
        if (fileSystem == null) {
            try {
                fileSystem = newFileSystem(uri, null);
            } catch (IOException e) {
                throw (FileSystemNotFoundException) new FileSystemNotFoundException(schemeSpecificPart).initCause(e);
            }
        }
        return fileSystem;
    }

    @Override
    public Path getPath(URI uri) {
        String str = uri.getSchemeSpecificPart();
        return getFileSystem(uri).getPath(str);
    }

    @Override
    public FileChannel newFileChannel(Path path, Set<? extends OpenOption> options,
                                      FileAttribute<?>... attrs) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return ((UserFilePath) path).getFileSystem().newFileChannel(path, options, attrs);
    }

    @Override
    public SeekableByteChannel newByteChannel(Path path, Set<? extends OpenOption> options, FileAttribute<?>... attrs) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return ((UserFilePath) path).getFileSystem().newByteChannel(path, options, attrs);
    }

    @Override
    public DirectoryStream<Path> newDirectoryStream(Path dir, DirectoryStream.Filter<? super Path> filter) throws IOException {
        if (!(dir instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return ((UserFilePath) dir).getFileSystem().newDirectoryStream(dir, filter);
    }

    @Override
    public void createDirectory(Path dir, FileAttribute<?>... attrs) throws IOException {
        if (!(dir instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        ((UserFilePath) dir).getFileSystem().createDirectory(dir, attrs);
    }

    @Override
    public void delete(Path path) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        ((UserFilePath) path).getFileSystem().delete(path);
    }

    @Override
    public void copy(Path source, Path target, CopyOption... options) throws IOException {
        if (!(source instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        if (!(target instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        // Is copy same as move???
        ((UserFilePath) source).getFileSystem().copy(source, target, options);

    }

    @Override
    public void move(Path source, Path target, CopyOption... options) throws IOException {
        if (!(source instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        if (!(target instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        ((UserFilePath) source).getFileSystem().move(source, target, options);
    }

    @Override
    public boolean isSameFile(Path path, Path path2) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        if (!(path2 instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return path.toAbsolutePath().toString().equals(path2.toAbsolutePath().toString());
    }

    @Override
    public boolean isHidden(Path path) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return false;
    }

    @Override
    public FileStore getFileStore(Path path) throws IOException {
        throw new UnsupportedOperationException();
    }

    @Override
    public void checkAccess(Path path, AccessMode... modes) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        ((UserFilePath) path).getFileSystem().checkAccess(path, modes);
    }

    @Override
    public <V extends FileAttributeView> V getFileAttributeView(Path path, Class<V> type, LinkOption... options) {
        throw new UnsupportedOperationException();
    }

    @Override
    public <A extends BasicFileAttributes> A readAttributes(Path path, Class<A> type, LinkOption... options) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return ((UserFilePath) path).getFileSystem().readAttributes(path, type, options);
    }

    @Override
    public Map<String, Object> readAttributes(Path path, String attributes, LinkOption... options) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        return ((UserFilePath) path).getFileSystem().readAttributes(path, attributes, options);
    }

    @Override
    public void setAttribute(Path path, String attribute, Object value, LinkOption... options) throws IOException {
        if (!(path instanceof UserFilePath)) {
            throw new ProviderMismatchException();
        }
        ((UserFilePath) path).getFileSystem().setAttribute(path, attribute, value, options);
    }
}