edu.iu.dsc.tws.data.fs.local

Class LocalFileSystem

java.lang.Object

edu.iu.dsc.tws.api.data.FileSystem

edu.iu.dsc.tws.data.fs.local.LocalFileSystem

All Implemented Interfaces:

java.io.Serializable

public class LocalFileSystem
extends FileSystem

Represents a local file system.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class edu.iu.dsc.tws.api.data.FileSystem

FileSystem.WriteMode

Constructor Summary

Constructors

Constructor and Description
LocalFileSystem() Constructs a new LocalFileSystem object.

Method Summary

Modifier and Type	Method and Description
FSDataOutputStream	create(Path filePath) Create a file system with the OVERWRITE
FSDataOutputStream	create(Path filePath, FileSystem.WriteMode writeMode) Create a file system with the specific write mdoe
boolean	delete(Path f, boolean recursive)
boolean	exists(Path path) Check if the given path exsits
long	getDefaultBlockSize()
BlockLocation[]	getFileBlockLocations(FileStatus file, long start, long len) Return an array containing hostnames, offset and size of portions of the given file.
FileStatus	getFileStatus(Path f) Return a file status object that represents the path.
java.net.URI	getUri() Returns a URI whose scheme and authority identify this file system.
Path	getWorkingDirectory() Get the working Directory
void	initialize(java.net.URI name) Called after a new FileSystem instance is constructed.
boolean	isDistributedFS()
FileStatus[]	listFiles(Path f) List the statuses of the files/directories in the given path if the path is a directory.
FileStatus[]	listStatus(Path f)
boolean	mkdirs(Path f)
FSDataInputStream	open(Path f) Opens an FSDataInputStream at the indicated Path.
FSDataInputStream	open(Path path, int bufferSize)
boolean	rename(Path src, Path dst)
void	setWorkingDirectory(Path path) Set the working Directory

Methods inherited from class edu.iu.dsc.tws.api.data.FileSystem

isDirectory, isFile, isSymlink

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

LocalFileSystem

public LocalFileSystem()

Constructs a new LocalFileSystem object.

Method Detail

setWorkingDirectory

public void setWorkingDirectory(Path path)

Description copied from class: FileSystem

Set the working Directory

Specified by:

setWorkingDirectory in class FileSystem

getWorkingDirectory

public Path getWorkingDirectory()

Description copied from class: FileSystem

Get the working Directory

Specified by:

getWorkingDirectory in class FileSystem

getUri

public java.net.URI getUri()

Description copied from class: FileSystem

Returns a URI whose scheme and authority identify this file system.

Specified by:

getUri in class FileSystem

Returns:

a URI whose scheme and authority identify this file system

initialize

public void initialize(java.net.URI name)
                throws java.io.IOException

Description copied from class: FileSystem

Called after a new FileSystem instance is constructed.

Specified by:

initialize in class FileSystem

Parameters:

name - a URI whose authority section names the host, port, etc. for this file system

Throws:

java.io.IOException

getFileStatus

public FileStatus getFileStatus(Path f)
                         throws java.io.IOException

Description copied from class: FileSystem

Return a file status object that represents the path.

Specified by:

getFileStatus in class FileSystem

Parameters:

f - The path we want information from

Returns:

a FileStatus object

Throws:

java.io.FileNotFoundException - when the path does not exist; IOException see specific implementation

java.io.IOException

listFiles

public FileStatus[] listFiles(Path f)
                       throws java.io.IOException

Description copied from class: FileSystem

List the statuses of the files/directories in the given path if the path is a directory.

Specified by:

listFiles in class FileSystem

Parameters:

f - given path

Returns:

the statuses of the files/directories in the given patch

Throws:

java.io.IOException

open

public FSDataInputStream open(Path f)
                       throws java.io.IOException

Description copied from class: FileSystem

Opens an FSDataInputStream at the indicated Path.

Specified by:

open in class FileSystem

Parameters:

f - the file to open

Throws:

java.io.IOException

getFileBlockLocations

public BlockLocation[] getFileBlockLocations(FileStatus file,
                                             long start,
                                             long len)
                                      throws java.io.IOException

Description copied from class: FileSystem

Return an array containing hostnames, offset and size of portions of the given file. For a nonexistent file or regions, null will be returned. This call is most helpful with DFS, where it returns hostnames of machines that contain the given file. The FileSystem will simply return an elt containing 'localhost'.

Specified by:

getFileBlockLocations in class FileSystem

Throws:

java.io.IOException

open

public FSDataInputStream open(Path path,
                              int bufferSize)
                       throws java.io.IOException

Specified by:

open in class FileSystem

Throws:

java.io.IOException

create

public FSDataOutputStream create(Path filePath)
                          throws java.io.IOException

Description copied from class: FileSystem

Create a file system with the OVERWRITE

Specified by:

create in class FileSystem

Parameters:

filePath - path

Returns:

the output stream

Throws:

java.io.IOException - if an error occurs

create

public FSDataOutputStream create(Path filePath,
                                 FileSystem.WriteMode writeMode)
                          throws java.io.IOException

Description copied from class: FileSystem

Create a file system with the specific write mdoe

Specified by:

create in class FileSystem

Parameters:

filePath - path

writeMode - weather overwrite or not, when creating new files

Returns:

the output stream

Throws:

java.io.IOException - if an error occurs

delete

public boolean delete(Path f,
                      boolean recursive)
               throws java.io.IOException

Specified by:

delete in class FileSystem

Throws:

java.io.IOException

listStatus

public FileStatus[] listStatus(Path f)
                        throws java.io.IOException

Specified by:

listStatus in class FileSystem

Throws:

java.io.IOException

mkdirs

public boolean mkdirs(Path f)
               throws java.io.IOException

Specified by:

mkdirs in class FileSystem

Throws:

java.io.IOException

exists

public boolean exists(Path path)
               throws java.io.IOException

Description copied from class: FileSystem

Check if the given path exsits

Overrides:

exists in class FileSystem

Throws:

java.io.IOException

rename

public boolean rename(Path src,
                      Path dst)
               throws java.io.IOException

Specified by:

rename in class FileSystem

Throws:

java.io.IOException

getDefaultBlockSize

public long getDefaultBlockSize()

Specified by:

getDefaultBlockSize in class FileSystem

isDistributedFS

public boolean isDistributedFS()

Specified by:

isDistributedFS in class FileSystem