org.terrier.utility.io

Class LocalFileSystem

java.lang.Object

org.terrier.utility.io.LocalFileSystem

All Implemented Interfaces:

Files.FSCapability, FileSystem

public class LocalFileSystem
extends Object
implements FileSystem, Files.FSCapability

This is a Terrier File Abstraction Layer implementation of the local file system. The file system implementation for the "file:" scheme can handle all file system capabilities (READ,WRITE,RANDOM_READ,RANDOM_WRITE,LS_DIR and STAT). Generally speaking, this is a lightweight wrapper around the following four Java SE classes: java.io.File and java.io.FileInputStream and java.io.FileOutputStream, java.io.RandomAccessFile.

On Windows, this FileSystem also advertises support for all the single-letter file systems, eg A:, C:, D:

Since:

2.1

Author:

Craig Macdonald

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	LocalFileSystem.LocalRandomAccessFile A file that supports random access

Field Summary

Fields inherited from interface org.terrier.utility.Files.FSCapability

DEL_ON_EXIT, LS_DIR, RANDOM_READ, RANDOM_WRITE, READ, STAT, WRITE

Constructor Summary

Constructors

Constructor and Description
LocalFileSystem()

Method Summary

Modifier and Type	Method and Description
boolean	canRead(String filename) returns true if filename can be read
boolean	canWrite(String filename) returns true if filename can be written to
byte	capabilities() Get the capabilities of the file system
boolean	delete(String filename) Delete a file
boolean	deleteOnExit(String pathname) Delete the file on program exit
boolean	exists(String filename) Does the file exist?
String	getParent(String path) whats the parent path to this path - eg directory containing a file
boolean	isDirectory(String path) Does the path point to a directory
long	length(String filename) What is the length of the file?
String[]	list(String path) list contents of a directory etc
boolean	mkdir(String filename) Make a directory
String	name() Get the name of the file system
protected String	normalise(String filename)
RandomDataInput	openFileRandom(String filename) Opens an input random access file
InputStream	openFileStream(String filename) Opens an input file
boolean	rename(String source, String destination) rename a file/dir to another name, on the same file system
String[]	schemes() Get the schemes
RandomDataOutput	writeFileRandom(String filename) Opens a writable random access file
OutputStream	writeFileStream(String filename) Opens an output file

Methods inherited from class java.lang.Object

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

Constructor Detail

LocalFileSystem

public LocalFileSystem()

Method Detail

normalise

protected String normalise(String filename)

name

public String name()

Get the name of the file system

Specified by:

name in interface FileSystem

capabilities

public byte capabilities()

Get the capabilities of the file system

Specified by:

capabilities in interface FileSystem

schemes

public String[] schemes()

Get the schemes

Specified by:

schemes in interface FileSystem

exists

public boolean exists(String filename)

Does the file exist?

Specified by:

exists in interface FileSystem

canRead

public boolean canRead(String filename)

returns true if filename can be read

Specified by:

canRead in interface FileSystem

canWrite

public boolean canWrite(String filename)

returns true if filename can be written to

Specified by:

canWrite in interface FileSystem

openFileStream

public InputStream openFileStream(String filename)
                           throws IOException

Opens an input file

Specified by:

openFileStream in interface FileSystem

Throws:

IOException

writeFileStream

public OutputStream writeFileStream(String filename)
                             throws IOException

Opens an output file

Specified by:

writeFileStream in interface FileSystem

Throws:

IOException

openFileRandom

public RandomDataInput openFileRandom(String filename)
                               throws IOException

Opens an input random access file

Specified by:

openFileRandom in interface FileSystem

Throws:

IOException

writeFileRandom

public RandomDataOutput writeFileRandom(String filename)
                                 throws IOException

Opens a writable random access file

Specified by:

writeFileRandom in interface FileSystem

Throws:

IOException

delete

public boolean delete(String filename)

Delete a file

Specified by:

delete in interface FileSystem

deleteOnExit

public boolean deleteOnExit(String pathname)
                     throws IOException

Delete the file on program exit

Specified by:

deleteOnExit in interface FileSystem

Throws:

IOException

mkdir

public boolean mkdir(String filename)

Make a directory

Specified by:

mkdir in interface FileSystem

isDirectory

public boolean isDirectory(String path)

Does the path point to a directory

Specified by:

isDirectory in interface FileSystem

length

public long length(String filename)

What is the length of the file?

Specified by:

length in interface FileSystem

rename

public boolean rename(String source,
                      String destination)
               throws IOException

rename a file/dir to another name, on the same file system

Specified by:

rename in interface FileSystem

Throws:

IOException

getParent

public String getParent(String path)
                 throws IOException

whats the parent path to this path - eg directory containing a file

Specified by:

getParent in interface FileSystem

Throws:

IOException

list

public String[] list(String path)
              throws IOException

list contents of a directory etc

Specified by:

list in interface FileSystem

Throws:

IOException