org.apache.commons.jrcs.diff

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Java Source Code / Java Documentation » ERP CRM Financial » sakai » org.apache.commons.jrcs.diff 
org.apache.commons.jrcs.diff

The {@link org.apache.maven.jrcs.diff diff} package implements the differencing engine that JRCS uses. The engine has the power of Unix diff, is simple to understand, and can be used independently of the archive handling functionality. The entry point to the differencing engine is class {@link org.apache.maven.jrcs.diff.Diff Diff}.

Text is represented as Object[] because the diff engine is capable of handling more than plain ascci. In fact, arrays of any type that implements {@link java.lang.Object#hashCode hashCode()} and {@link java.lang.Object#equals equals()} correctly can be subject to differencing using this library.

Two implementations of the differencing algorithm are provided.

  • {@link SimpleDiff Simple Diff} is a verys imple algorithm that is fast and works well with very large input sequences, but that frequently produces result that are subotimal (at times four or more times larger than GNU diff).
  • {@link org.apache.commons.jrcs.diff.myers.MyersDiff MyersDiff} is an implementation of Gene Myers differencing algorithm. Myer's algorithm produces optimum results (minimum diffs), but consumes considerably more memory than SimpleDiff, so its not suitable for very large files.
@author Juanco Anez
@version $Id: package.html 2891 2005-10-25 17:30:31Z ian@caret.cam.ac.uk $
@see Diff 
@see org.apache.maven.jrcs.rcs.Archive
Java Source File NameTypeComment
AddDelta.javaClass Holds an add-delta between to revisions of a text.
ChangeDelta.javaClass Holds an change-delta between to revisions of a text.
Chunk.javaClass Holds a information about a parrt of the text involved in a differencing or patching operation.
DeleteDelta.javaClass Holds a delete-delta between to revisions of a text.
Delta.javaClass Holds a "delta" difference between to revisions of a text.
Diff.javaClass Implements a differencing engine that works on arrays of Object Object .

Within this library, the word text means a unit of information subject to version control.

Text is represented as Object[] because the diff engine is capable of handling more than plain ascci.

DiffAlgorithm.javaInterface A simple interface for implementations of differencing algorithms.
DifferentiationFailedException.javaClass Thrown whenever the differencing engine cannot produce the differences between two revisions of ta text.
DiffException.javaClass Base class for all exceptions emanating from this package.
DiffTest.javaClass
MyersDiffTests.javaClass
PatchFailedException.javaClass Thrown whenever a delta cannot be applied as a patch to a given text.
Revision.javaClass A Revision holds the series of deltas that describe the differences between two sequences.
RevisionVisitor.javaInterface
SimpleDiff.javaClass Implements a simple differencing algortithm.


version:
   $Revision: 7756 $
author:
   Juanco Anez
author:
  


author:
   Overview of Algorithm
author:
  


author:
  


author:
   by bwm
author:
  


author:
  


author:
   The algorithm is optimised for situations where the input sequences
author:
   have few repeated objects.

SimpleDiffTests.javaClass
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