net.nutch.fs
Class FSDirectory

java.lang.Object
  net.nutch.fs.FSDirectory

public class FSDirectory

extends Object

FSDirectory stores the filesystem directory state. It handles writing/loading values to disk, and logging changes as we go. It keeps the filename->blockset mapping always-current and logged to disk.

Author:

Mike Cafarella

Constructor Summary

FSDirectory(File dir)
Create a FileSystem directory, and load its info from the indicated place.

Method Summary

boolean	addFile(UTF8 src, Block[] blocks) Add the given filename to the fs.
void	close() Shutdown the filestore
Block[]	delete(UTF8 src) Remove the file from management, return blocks
Block[]	getFile(UTF8 src) Get the blocks associated with the file
UTF8[]	getListing(UTF8 src) Get a listing of files given path 'src' This function is admittedly very inefficient right now.
boolean	isDir(UTF8 src) Check whether it's a directory
boolean	isValidBlock(Block b) Returns whether the given block is one pointed-to by a file.
boolean	isValidToCreate(UTF8 src) Check whether the filepath could be created
boolean	renameTo(UTF8 src, UTF8 dst) Change the filename

Methods inherited from class java.lang.Object

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

Constructor Detail

FSDirectory

public FSDirectory(File dir)
            throws IOException

Create a FileSystem directory, and load its info from the indicated place.

Method Detail

close

public void close()
           throws IOException

Shutdown the filestore

Throws:

IOException

addFile

public boolean addFile(UTF8 src,
                       Block[] blocks)

Add the given filename to the fs.

renameTo

public boolean renameTo(UTF8 src,
                        UTF8 dst)

Change the filename

delete

public Block[] delete(UTF8 src)

Remove the file from management, return blocks

getListing

public UTF8[] getListing(UTF8 src)

Get a listing of files given path 'src' This function is admittedly very inefficient right now. We'll make it better later.

getFile

public Block[] getFile(UTF8 src)

Get the blocks associated with the file

isValidToCreate

public boolean isValidToCreate(UTF8 src)

Check whether the filepath could be created

isDir

public boolean isDir(UTF8 src)

Check whether it's a directory

isValidBlock

public boolean isValidBlock(Block b)

Returns whether the given block is one pointed-to by a file.