goofs

Class Chunk

java.lang.Object

goofs.Chunk

All Implemented Interfaces:

java.io.Serializable

public class Chunk
extends java.lang.Object
implements java.io.Serializable

Chunk, or piece, of a file in goofs filesystem.

Author:

Elliott Forney

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static int	checkSize size of checksum slice
static int	maxSize maximum bytes in a single chunk

Constructor Summary

Constructors

Constructor and Description
Chunk(ChunkDescriptor chunkDesc, byte[] data)
Chunk(java.io.File f, int sequence, byte[] data) Create a chunk containing a piece of a file
Chunk(java.io.File f, int sequence, int version, long timeStamp, Hash[] checkSums, byte[] data)

Method Summary

Modifier and Type	Method and Description
static void	delete(ChunkDescriptor chunkDesc)
byte[]	getData() Get data stored by this chunk
java.io.File	getFile()
int	getSequence()
long	getTimeStamp()
int	getVersion()
static Chunk	read(ChunkDescriptor cd) Read chunk from disk.
void	setData(byte[] data)
java.lang.String	toString()
void	write() Write chunk to disk.

Methods inherited from class java.lang.Object

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

Field Detail

maxSize

public static final int maxSize

maximum bytes in a single chunk

See Also:

Constant Field Values

checkSize

public static final int checkSize

size of checksum slice

See Also:

Constant Field Values

Constructor Detail

Chunk

public Chunk(java.io.File f,
             int sequence,
             byte[] data)
      throws java.lang.Exception

Create a chunk containing a piece of a file

Parameters:

f - Abstract pathname of file containing this chunk

data - Bytes belonging to this chunk

sequence - Chunk number within the file

Throws:

java.lang.Exception

Chunk

public Chunk(ChunkDescriptor chunkDesc,
             byte[] data)
      throws java.lang.Exception

Throws:

java.lang.Exception

Chunk

public Chunk(java.io.File f,
             int sequence,
             int version,
             long timeStamp,
             Hash[] checkSums,
             byte[] data)

Method Detail

getFile

public java.io.File getFile()

getSequence

public int getSequence()

getVersion

public int getVersion()

getTimeStamp

public long getTimeStamp()

getData

public byte[] getData()

Get data stored by this chunk

setData

public void setData(byte[] data)
             throws java.lang.Exception

Throws:

java.lang.Exception

delete

public static void delete(ChunkDescriptor chunkDesc)

read

public static Chunk read(ChunkDescriptor cd)
                  throws java.lang.Exception

Read chunk from disk.

Throws:

java.lang.Exception

write

public void write()
           throws java.lang.Exception

Write chunk to disk.

Throws:

java.lang.Exception

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object