Java FileStore getTopResourceInVolume(URI location)

Description

get Top Resource In Volume

License

Apache License

Declaration

public static URI getTopResourceInVolume(URI location) throws IOException 

Method Source Code

//package com.java2s;
/**// w  ww  .  j  a  v a  2  s.  c  om
 * Copyright 2010 The University of North Carolina at Chapel Hill
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.io.IOException;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.file.FileStore;
import java.nio.file.FileSystems;

import java.nio.file.Path;
import java.nio.file.Paths;

public class Main {
    public static URI getTopResourceInVolume(URI location) throws IOException {
        Path path = Paths.get(location);
        FileStore fstore = getFileStore(location);
        Path p = findTopResourceInVolume(fstore, path);
        try {
            URI result = new URI(location.getScheme(), location.getUserInfo(), location.getHost(),
                    location.getPort(), p.toUri().getPath(), location.getQuery(), location.getFragment());
            return result;
        } catch (URISyntaxException e) {
            throw new Error(e);
        }
    }

    public static FileStore getFileStore(URI uri) throws IOException {
        Path path = Paths.get(uri);
        FileStore fstore = path.getFileSystem().provider().getFileStore(path);
        return fstore;
    }

    private static Path findTopResourceInVolume(FileStore fstore, Path path) throws IOException {
        Path parent = path.getParent();
        if (parent == null) {
            return path; // root will do for default file system
        } else {
            FileStore parentStore = FileSystems.getDefault().provider().getFileStore(parent);
            if (fstore.equals(parentStore)) {
                return findTopResourceInVolume(fstore, parent);
            } else {
                return path;
            }
        }
    }
}

Related

1. getFileStore(Path path)
2. getFileStore(URI uri)
3. getMountPoint(FileStore store)
4. getPosixAttributes(Path file)
5. getStorageName(final File file)
6. isPosixFileStore(Path path)
7. isPosixFileSystem()
8. spinsLinux(Path path)