io.milton.zsync

Class FileMaker

java.lang.Object

io.milton.zsync.FileMaker

public class FileMaker
extends Object

This class is normally used to create a copy of a remote file, where a local copy is already present which might contain some or all of the remote data. FileMaker implements an algorithm similar to rsync which optimises the amount of data downloaded by matching blocks of data in the local file against the remote and only downloading blocks which differ. The given local file is not updated by this class, instead a copy is produced as a temp file, and it is up to the calling code to replace the old local file with the new one. Most of the code in this package was taken from the jazsync project, please see the header comments for license details.

Author:

Tomáš Hlavnička, modified by Brad McEvoy

Constructor Summary

Constructors

Constructor and Description
FileMaker()

Method Summary

Modifier and Type	Method and Description
List<Range>	findMissingRanges(File inputFile, File metafile) Determine what ranges need to be provided to sync the file.
File	make(File inputFile, File metafile, RangeLoader rangeLoader)

Methods inherited from class java.lang.Object

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

Constructor Detail

FileMaker

public FileMaker()

Method Detail

make

public File make(File inputFile,
                 File metafile,
                 RangeLoader rangeLoader)
          throws Exception

Parameters:

inputFile - - the "local" file, containing data which needs to be merged with that on the server

metafile - - meta file, containing headers and checksums of the "remote", generated by MetaFileMaker

rangeLoader - - accessor object, to get the binary data of the "remote" file

Throws:

Exception

findMissingRanges

public List<Range> findMissingRanges(File inputFile,
                                     File metafile)
                              throws Exception

Determine what ranges need to be provided to sync the file.

Parameters:

mfr -

inputFile -

rangeLoader -

dryRun -

Returns:

- null indicates everything is needed, ie whole file

Throws:

Exception