io.milton.zsync

Class MakeContextEx

java.lang.Object

io.milton.zsync.MakeContext

io.milton.zsync.MakeContextEx

public class MakeContextEx
extends MakeContext

An extension of MakeContext that stores block matches in a way more suitable for upload.

This object differs from a MakeContext in that it allows multiple local blocks to be matched to a single remote block. It does this by overriding the put method to save matches to an array of Lists, rather than to fileMap, which only allows one entry per remote block. It also overrides the delete method to do nothing, instead of removing the ChecksumPair from the ChainingHash.

MakeContextEx is used internally by UploadMakerEx in place of MakeContext as an argument to MapMatcher.mapMatcher.

Author:

Nick

See Also:

UploadMakerEx

Constructor Summary

Constructors

Constructor and Description
MakeContextEx(ChainingHash hashtable, int blockcount, int blocksize) Constructs a MakeContextEx from an already-initialized ChainingHash.

Method Summary

Modifier and Type	Method and Description
int	blockcount()
void	delete(ChecksumPair key) Overrides delete in MakeContext to do nothing.
List<OffsetPair>	getReverseMap() Returns a list of OffsetPairs representing the block-matches between the local and remote file.
boolean	matched(int blockIndex)
void	put(int blockIndex, long offset) Adds a match to the list of block matches.
void	removematch(int blockIndex)

Methods inherited from class java.lang.Object

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

Constructor Detail

MakeContextEx

public MakeContextEx(ChainingHash hashtable,
                     int blockcount,
                     int blocksize)

Constructs a MakeContextEx from an already-initialized ChainingHash.

Parameters:

hashtable - The hashtable obtained from a MetaFileReader

blockcount - The number of blocks in the remote file

blocksize - The number of bytes per block

Method Detail

getReverseMap

public List<OffsetPair> getReverseMap()

Returns a list of OffsetPairs representing the block-matches between the local and remote file.

Returns:

The list of block matches

See Also:

OffsetPair

put

public void put(int blockIndex,
                long offset)

Adds a match to the list of block matches. Matching of overlapping client-side blocks is prevented.

Overrides:

put in class MakeContext

Parameters:

blockIndex - Index of the remote block

offset - Byte offset of the local block

delete

public void delete(ChecksumPair key)

Overrides delete in MakeContext to do nothing. Local blocks with the identical checksums will all then match to the first matching ChecksumPair in ChainingHash

Overrides:

delete in class MakeContext

Parameters:

key - Unused in this override. Can be null

matched

public boolean matched(int blockIndex)

Overrides:

matched in class MakeContext

removematch

public void removematch(int blockIndex)

Overrides:

removematch in class MakeContext

blockcount

public int blockcount()

Overrides:

blockcount in class MakeContext