All Known Implementing Classes:

BasedFileSystem, DatabaseFileSystem, DB2FileSystem, DbFileSystem, DerbyFileSystem, JNDIDatabaseFileSystem, LocalFileSystem, MemoryFileSystem, MSSqlFileSystem, Oracle9FileSystem, OracleFileSystem, VFSFileSystem
```
public interface FileSystem
```
The FileSystem interface is an abstraction of a virtual file system. The similarities of its method names with with the methods of the java.io.File class are intentional.
Implementations of this interface expose a file system-like resource. File system-like resources include WebDAV-enabled servers, local file systems, and so forth.

Field Summary

Fields
Modifier and Type Field Description

static String SEPARATOR
File separator

static char SEPARATOR_CHAR
File separator character

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`void`	`close()`	Close the file system.
`void`	`createFolder(String folderPath)`	Creates the folder named by this path, including any necessary but nonexistent parent folders.
`void`	`deleteFile(String filePath)`	Deletes the file denoted by this path.
`void`	`deleteFolder(String folderPath)`	Deletes the folder denoted by this path.
`boolean`	`exists(String path)`	Tests whether the file system entry denoted by this path exists.
`InputStream`	`getInputStream(String filePath)`	Returns an input stream of the contents of the file denoted by this path.
`OutputStream`	`getOutputStream(String filePath)`	Returns an output stream for writing bytes to the file denoted by this path.
`boolean`	`hasChildren(String path)`	Tests whether the file system entry denoted by this path has child entries.
`void`	`init()`	Initialize the file system
`boolean`	`isFile(String path)`	Tests whether the file system entry denoted by this path exists and is a file.
`boolean`	`isFolder(String path)`	Tests whether the file system entry denoted by this path exists and is a folder.
`long`	`lastModified(String path)`	Returns the time that the file system entry denoted by this path was last modified.
`long`	`length(String filePath)`	Returns the length of the file denoted by this path.
`String[]`	`list(String folderPath)`	Returns an array of strings naming the files and folders in the folder denoted by this path.
`String[]`	`listFiles(String folderPath)`	Returns an array of strings naming the files in the folder denoted by this path.
`String[]`	`listFolders(String folderPath)`	Returns an array of strings naming the folders in the folder denoted by this path.

- Field Detail
  - SEPARATOR
```
static final String SEPARATOR
```
    File separator
    
    See Also:
    
    Constant Field Values
  - SEPARATOR_CHAR
```
static final char SEPARATOR_CHAR
```
    File separator character
    
    See Also:
    
    Constant Field Values
- Method Detail
  - init
```
void init()
   throws FileSystemException
```
    Initialize the file system
    
    Throws:
    
    FileSystemException - if the file system initialization fails
  - close
```
void close()
    throws FileSystemException
```
    Close the file system. After calling this method, the file system is no longer accessible.
    
    Throws:
    
    FileSystemException
  - getInputStream
```
InputStream getInputStream(String filePath)
                    throws FileSystemException
```
    Returns an input stream of the contents of the file denoted by this path.
    
    Parameters:
    
    filePath - the path of the file.
    
    Returns:
    
    an input stream of the contents of the file.
    
    Throws:
    
    FileSystemException - if the file does not exist or if it cannot be read from
  - getOutputStream
```
OutputStream getOutputStream(String filePath)
                      throws FileSystemException
```
    Returns an output stream for writing bytes to the file denoted by this path. The file will be created if it doesn't exist. If the file exists, its contents will be overwritten.
    
    Parameters:
    
    filePath - the path of the file.
    
    Returns:
    
    an output stream for writing bytes to the file.
    
    Throws:
    
    FileSystemException - if the file cannot be written to or created
  - createFolder
```
void createFolder(String folderPath)
           throws FileSystemException
```
    Creates the folder named by this path, including any necessary but nonexistent parent folders. Note that if this operation fails it may have succeeded in creating some of the necessary parent folders.
    
    Parameters:
    
    folderPath - the path of the folder to be created.
    
    Throws:
    
    FileSystemException - if a file system entry denoted by path already exists or if another error occurs.
  - exists
```
boolean exists(String path)
        throws FileSystemException
```
    Tests whether the file system entry denoted by this path exists.
    
    Parameters:
    
    path - the path of a file system entry.
    
    Returns:
    
    true if the file system entry at path exists; false otherwise.
    
    Throws:
    
    FileSystemException
  - isFile
```
boolean isFile(String path)
        throws FileSystemException
```
    Tests whether the file system entry denoted by this path exists and is a file.
    
    Parameters:
    
    path - the path of a file system entry.
    
    Returns:
    
    true if the file system entry at path is a file; false otherwise.
    
    Throws:
    
    FileSystemException
  - isFolder
```
boolean isFolder(String path)
          throws FileSystemException
```
    Tests whether the file system entry denoted by this path exists and is a folder.
    
    Parameters:
    
    path - the path of a file system entry.
    
    Returns:
    
    true if the file system entry at path is a folder; false otherwise.
    
    Throws:
    
    FileSystemException
  - hasChildren
```
boolean hasChildren(String path)
             throws FileSystemException
```
    Tests whether the file system entry denoted by this path has child entries.
    
    Parameters:
    
    path - the path of a file system entry.
    
    Returns:
    
    true if the file system entry at path has child entries; false otherwise.
    
    Throws:
    
    FileSystemException
  - length
```
long length(String filePath)
     throws FileSystemException
```
    Returns the length of the file denoted by this path.
    
    Parameters:
    
    filePath - the path of the file.
    
    Returns:
    
    The length, in bytes, of the file denoted by this path, or -1L if the length can't be determined.
    
    Throws:
    
    FileSystemException - if the path does not denote an existing file.
  - lastModified
```
long lastModified(String path)
           throws FileSystemException
```
    Returns the time that the file system entry denoted by this path was last modified.
    
    Parameters:
    
    path - the path of a file system entry.
    
    Returns:
    
    A long value representing the time the file system entry was last modified, measured in milliseconds since the epoch (00:00:00 GMT, January 1, 1970), or 0L if the modification time can't be determined.
    
    Throws:
    
    FileSystemException - if the file system entry does not exist.
  - list
```
String[] list(String folderPath)
       throws FileSystemException
```
    Returns an array of strings naming the files and folders in the folder denoted by this path.
    
    Parameters:
    
    folderPath - the path of the folder whose contents is to be listed.
    
    Returns:
    
    an array of strings naming the files and folders in the folder denoted by this path.
    
    Throws:
    
    FileSystemException - if this path does not denote a folder or if another error occurs.
  - listFiles
```
String[] listFiles(String folderPath)
            throws FileSystemException
```
    Returns an array of strings naming the files in the folder denoted by this path.
    
    Parameters:
    
    folderPath - the path of the folder whose contents is to be listed.
    
    Returns:
    
    an array of strings naming the files in the folder denoted by this path.
    
    Throws:
    
    FileSystemException - if this path does not denote a folder or if another error occurs.
  - listFolders
```
String[] listFolders(String folderPath)
              throws FileSystemException
```
    Returns an array of strings naming the folders in the folder denoted by this path.
    
    Parameters:
    
    folderPath - the path of the folder whose contents is to be listed.
    
    Returns:
    
    an array of strings naming the folders in the folder denoted by this path.
    
    Throws:
    
    FileSystemException - if this path does not denote a folder or if another error occurs.
  - deleteFile
```
void deleteFile(String filePath)
         throws FileSystemException
```
    Deletes the file denoted by this path.
    
    Parameters:
    
    filePath - the path of the file to be deleted.
    
    Throws:
    
    FileSystemException - if this path does not denote a file or if another error occurs.
  - deleteFolder
```
void deleteFolder(String folderPath)
           throws FileSystemException
```
    Deletes the folder denoted by this path. Any contents of this folder (folders and files) will be deleted recursively.
    
    Parameters:
    
    folderPath - the path of the folder to be deleted.
    
    Throws:
    
    FileSystemException - if this path does not denote a folder or if another error occurs.

Modifier and Type	Field	Description
`static String`	`SEPARATOR`	File separator
`static char`	`SEPARATOR_CHAR`	File separator character

Interface FileSystem

Field Summary

Method Summary

Field Detail

SEPARATOR

SEPARATOR_CHAR

Method Detail

init

close

getInputStream

getOutputStream

createFolder

exists

isFile

isFolder

hasChildren

length

lastModified

list

listFiles

listFolders

deleteFile

deleteFolder