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Shawn O. Pearce 857d68d173 Perform common start/end elimination by default for DiffAlgorithm
As it turns out, every single diff algorithm we might try to
implement can benfit from using the SequenceComparator's native
concept of the simple reduceCommonStartEnd() step.  For most inputs,
there can be a significant number of elements that can be removed
from the space the DiffAlgorithm needs to consider, which will
reduce the overall running time for the final solution.

Pool this logic inside of DiffAlgorithm itself as a default, but
permit a specific algorithm to override it when necessary.

Convert MyersDiff to use this reduction to reduce the space it
needs to search, making it perform slightly better on common inputs.

Change-Id: I14004d771117e4a4ab2a02cace8deaeda9814bc1
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2010-09-21 18:00:59 -07:00
org.eclipse.jgit Perform common start/end elimination by default for DiffAlgorithm 2010-09-21 18:00:59 -07:00
org.eclipse.jgit.console Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00
org.eclipse.jgit.http.server Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00
org.eclipse.jgit.http.test Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00
org.eclipse.jgit.iplog Merge "Define DiffAlgorithm as an abstract function" 2010-09-17 15:08:27 -04:00
org.eclipse.jgit.junit Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00
org.eclipse.jgit.packaging Fix dependency to jgit source bundle 2010-09-17 22:01:40 +02:00
org.eclipse.jgit.pgm Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00
org.eclipse.jgit.test Implement Bram Cohen's Patience Diff 2010-09-20 18:15:22 -07:00
org.eclipse.jgit.ui Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00
tools Clean up LICENSE file 2010-07-02 14:52:49 -07:00
.eclipse_iplog Update .eclipse_iplog for 0.9 2010-09-08 23:17:54 +02:00
.gitattributes Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
LICENSE Clean up LICENSE file 2010-07-02 14:52:49 -07:00
README Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
SUBMITTING_PATCHES Correcting explanation of EDL 2009-10-28 14:12:07 +01:00
pom.xml Qualify builds as 0.10.0 2010-09-16 17:26:53 -07:00

README

            == Java GIT ==

This package is licensed under the BSD.

  org.eclipse.jgit/

    A pure Java library capable of being run standalone, with no
    additional support libraries.  Some JUnit tests are provided
    to exercise the library.  The library provides functions to
    read and write a GIT formatted repository.

    All portions of jgit are covered by the BSD.  Absolutely no GPL,
    LGPL or EPL contributions are accepted within this package.

  org.eclipse.jgit.test/
    Unit tests for org.eclipse.jgit and the same licensing rules.

            == WARNINGS / CAVEATS              ==

- Symbolic links are not supported because java does not support it.
  Such links could be damaged.

- Only the timestamp of the index is used by jgit check if  the index
  is dirty.

- Don't try the library with a JDK other than 1.6 (Java 6) unless you
  are prepared to investigate problems yourself. JDK 1.5.0_11 and later
  Java 5 versions *may* work. Earlier versions do not. JDK 1.4 is *not*
  supported. Apple's Java 1.5.0_07 is reported to work acceptably. We
  have no information about other vendors. Please report your findings
  if you try.

- CRLF conversion is never performed. On Windows you should thereforc
  make sure your projects and workspaces are configured to save files
  with Unix (LF) line endings.

            == Package Features                ==

  org.eclipse.jgit/

    * Read loose and packed commits, trees, blobs, including
      deltafied objects.

    * Read objects from shared repositories

    * Write loose commits, trees, blobs.

    * Write blobs from local files or Java InputStreams.

    * Read blobs as Java InputStreams.

    * Copy trees to local directory, or local directory to a tree.

    * Lazily loads objects as necessary.

    * Read and write .git/config files.

    * Create a new repository.

    * Read and write refs, including walking through symrefs.

    * Read, update and write the Git index.

    * Checkout in dirty working directory if trivial.

    * Walk the history from a given set of commits looking for commits
      introducing changes in files under a specified path.

    * Object transport
      Fetch via ssh, git, http, Amazon S3 and bundles.
      Push via ssh, git and Amazon S3. JGit does not yet deltify
      the pushed packs so they may be a lot larger than C Git packs.

  org.eclipse.jgit.pgm/

    * Assorted set of command line utilities. Mostly for ad-hoc testing of jgit
      log, glog, fetch etc.

            == Missing Features                ==

There are a lot of missing features. You need the real Git for this.
For some operations it may just be the preferred solution also. There
are not just a command line, there is e.g. git-gui that makes committing
partial files simple.

- Merging. 

- Repacking.

- Generate a GIT format patch.

- Apply a GIT format patch.

- Documentation. :-)

- gitattributes support
  In particular CRLF conversion is not implemented. Files are treated
  as byte sequences.

- submodule support
  Submodules are not supported or even recognized.

            == Support                         ==

  Post question, comments or patches to the git@vger.kernel.org mailing list.


            == Contributing                    ==

  See SUBMITTING_PATCHES in this directory. However, feedback and bug reports
  are also contributions.


            == About GIT                       ==

More information about GIT, its repository format, and the canonical
C based implementation can be obtained from the GIT websites:

  http://git.or.cz/
  http://www.kernel.org/pub/software/scm/git/
  http://www.kernel.org/pub/software/scm/git/docs/