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Shawn O. Pearce 86547022f0 Tighten up local packed object representation during packing
Rather than making a loader, and then using that to fill the object
representation, parse the header and set up our data directly.
This saves some time, as we don't waste cycles on information we
won't use right now.

The weight computed for a representation is now its actual stored
size in the pack file, rather than its inflated size.  This accounts
for changes made when the compression level is modified on the
repository.  It is however more costly to determine the weight of
the object, since we have to find its length in the pack.  To try and
recover that cost we now cache the length as part of our ObjectToPack
record, so it doesn't have to be found during the output phase.

A LocalObjectToPack now costs us (assuming 32 bit pointers):

                   (32 bit)     (64 bit)
  vm header:         8 bytes      8 bytes
  ObjectId:         20 bytes     20 bytes
  PackedObjectInfo: 12 bytes     12 bytes
  ObjectToPack:      8 bytes     12 bytes
  LocalOTP:         20 bytes     24 bytes
                 -----------    ---------
                    68 bytes     74 bytes

Change-Id: I923d2736186eb2ac8ab498d3eb137e17930fcb50
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2010-06-26 18:50:38 -07:00
org.eclipse.jgit Tighten up local packed object representation during packing 2010-06-26 18:50:38 -07:00
org.eclipse.jgit.console Start 0.9 development 2010-06-14 08:11:27 -07:00
org.eclipse.jgit.http.server Move FileRepository to storage.file.FileRepository 2010-06-26 18:50:34 -07:00
org.eclipse.jgit.http.test Move FileRepository to storage.file.FileRepository 2010-06-26 18:50:34 -07:00
org.eclipse.jgit.iplog Move FileRepository to storage.file.FileRepository 2010-06-26 18:50:34 -07:00
org.eclipse.jgit.junit Move FileRepository to storage.file.FileRepository 2010-06-26 18:50:34 -07:00
org.eclipse.jgit.packaging Change default target platform for maven build to galileo 2010-06-19 01:06:14 +02:00
org.eclipse.jgit.pgm Move FileRepository to storage.file.FileRepository 2010-06-26 18:50:34 -07:00
org.eclipse.jgit.test Move FileRepository to storage.file.FileRepository 2010-06-26 18:50:34 -07:00
org.eclipse.jgit.ui Merge changes I53f71dc0,I3a899a3a,I3e8bd245,Ie7c9db83,If396326e,I6f4cf8da,I3bf96dd0,I3a2a43a1,I292fe88c,Ia1cf40cf 2010-06-14 19:59:48 -04:00
tools tools/version.sh: Use backup files on Win32 2010-06-14 08:19:56 -07:00
.eclipse_iplog eclipse-iplog: Use contribution rather than bug element 2010-05-28 15:09:29 -07:00
.gitattributes Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -07:00
LICENSE Initial JGit contribution to eclipse.org 2009-09-29 16:47:03 -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 Start 0.9 development 2010-06-14 08:11:27 -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/