abstract public  void closeFile(byte[] handle) throws IOException, InvalidHandleException

 abstract public  void createSymbolicLink(String link,
    String target) throws UnsupportedFileOperationException, IOException, FileNotFoundException, PermissionDeniedException

 abstract public boolean fileExists(String path) throws IOException

 abstract public String getCanonicalPath(String path) throws IOException, FileNotFoundException

 abstract public String getDefaultPath(String username) throws FileNotFoundException

 abstract public FileAttributes getFileAttributes(String path) throws IOException, FileNotFoundException

 abstract public FileAttributes getFileAttributes(byte[] handle) throws IOException, InvalidHandleException

 public static NativeFileSystemProvider getInstance() 
{
     
        try {
            if (ConfigurationLoader.isConfigurationAvailable(
                        PlatformConfiguration.class)) {
                Class cls = ConfigurationLoader.getExtensionClass(((PlatformConfiguration) ConfigurationLoader.getConfiguration(
                            PlatformConfiguration.class)).getNativeFileSystemProvider());
                instance = (NativeFileSystemProvider) cls.newInstance();
            }
        } catch (Exception e) {
            log.error("Failed to load native file system provider", e);
            instance = null;
        }
        return instance;
}

 abstract public String getRealPath(String path) throws FileNotFoundException

 abstract public boolean makeDirectory(String path) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public byte[] openDirectory(String path) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public byte[] openFile(String path,
    UnsignedInteger32 flags,
    FileAttributes attrs) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public SftpFile[] readDirectory(byte[] handle) throws EOFException, IOException, InvalidHandleException

 abstract public byte[] readFile(byte[] handle,
    UnsignedInteger64 offset,
    UnsignedInteger32 len) throws EOFException, IOException, InvalidHandleException

 abstract public SftpFile readSymbolicLink(String path) throws UnsupportedFileOperationException, IOException, FileNotFoundException, PermissionDeniedException

 abstract public  void removeDirectory(String path) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public  void removeFile(String path) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public  void renameFile(String oldpath,
    String newpath) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public  void setFileAttributes(String path,
    FileAttributes attrs) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public  void setFileAttributes(byte[] handle,
    FileAttributes attrs) throws IOException, InvalidHandleException, PermissionDeniedException

 abstract public  void verifyPermissions(String username,
    String path,
    String permissions) throws IOException, FileNotFoundException, PermissionDeniedException

 abstract public  void writeFile(byte[] handle,
    UnsignedInteger64 offset,
    byte[] data,
    int off,
    int len) throws IOException, InvalidHandleException