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Google Drive Commons VFS provider

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package com.sshtools.vfs.googledrive;

import org.apache.commons.vfs2.FileName;
import org.apache.commons.vfs2.FileSystemException;
import org.apache.commons.vfs2.FileSystemManager;
import org.apache.commons.vfs2.FileType;
import org.apache.commons.vfs2.VFS;
import org.apache.commons.vfs2.provider.HostFileNameParser;
import org.apache.commons.vfs2.provider.UriParser;
import org.apache.commons.vfs2.provider.VfsComponentContext;

public class GDriveFileNameParser extends HostFileNameParser {

	private static final GDriveFileNameParser instance = new GDriveFileNameParser();

	public static GDriveFileNameParser getInstance() {
		return instance;
	}

	public GDriveFileNameParser() {
		super(443);
	}

	@Override
	public FileName parseUri(final VfsComponentContext context, FileName base, String filename)
			throws FileSystemException {
		final StringBuilder name = new StringBuilder();
		Authority auth = null;
		String path = null;
		FileType fileType;

		int eidx = filename.indexOf("@/");
		if (eidx != -1) 
			filename = filename.substring(0,  eidx + 1) + "google.com" + filename.substring(eidx + 1);

		String scheme;
		final FileSystemManager fsm;
        if (context != null) {
        	fsm = context.getFileSystemManager();
        } else {
        	fsm = VFS.getManager();
        }
		try {
			auth = extractToPath(context, filename, name);
			if (auth.getUserName() == null) {
				scheme = UriParser.extractScheme(fsm.getSchemes(), filename, name);
				UriParser.canonicalizePath(name, 0, name.length(), this);
				UriParser.fixSeparators(name);
			} else {
				scheme = auth.getScheme();
			}
			fileType = UriParser.normalisePath(name);
			path = name.toString();
			if (path.equals("")) {
				path = "/";
			}
		} catch (FileSystemException fse) {
			scheme = UriParser.extractScheme(fsm.getSchemes(), filename, name);
			UriParser.canonicalizePath(name, 0, name.length(), this);
			UriParser.fixSeparators(name);
			// final String rootFile = extractRootPrefix(filename, name);
			fileType = UriParser.normalisePath(name);
			path = name.toString();

		}
		return new GDriveFileName(scheme, path, fileType);
	}

}