Do not automatically organize imports using a save action since this
seems to be buggy and removed some annotations org.eclipse.jgit.pgm
needs to use args4j.

Change-Id: I5a91292c3b9241ce2dde3e4ecce14ad460097129
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Revert the following save actions which were introduced in c0ad77d8:
- always use braces around blocks
- remove unused imports

Other than I expected save actions are run globally on edited files -
and not only on edited code lines only.

Hence revert the save action "Convert control statement bodies to
blocks" which would affect a large number of code lines not affected by
the change editing some small part of a class. This would generate a
large number of changes which may lead to many unnecessary conflicts.
Total number of affected lines across jgit would be around 10k lines.

Also revert "Remove unused imports" since it erroneously removes imports
of some annotations needed by pgm classes using args4j.

Change-Id: I879a47f68e664129e6124cf25c1ae1f6a2d7a5aa
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Add the following Eclipse save actions executed when saving modified
lines. This should help to reduce manual work needed to maintain a clean
and consistent code style:
- organize imports
- always use braces around blocks
- add missing annotations
  - @Override including implementation of interface methods
  - @Deprecated
- remove
  - unused imports
  - unnecessary $NON-NLS$ tags
  - redundant type arguments

Also add default values for new settings that were introduced in recent
Eclipse versions up to Neon since we updated save rules the last time.

Change-Id: Idc90b249df044d0552f04edf01a5f607c4846f50
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Note the the settings are slightly less restrictive for test bundles.
-Also cleanup a couple of malformed javadocs
-Update compiler warnings/errors to include default values from Juno
-We now flag diagnosed null dereference as error. We didn't do that
 earlier because of some false positives.

Change-Id: I58386d63164e65d3d8d1998da3390d99bdc7381a
Signed-off-by: Chris Aniszczyk <zx@twitter.com>

CQ: 6385
Bug: 365444
Change-Id: I2d5164cd92429673fe3c37e9f5f9bc565192cc12
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

jgit.storage.dht is a storage provider implementation for JGit that
permits storing the Git repository in a distributed hashtable, NoSQL
system, or other database.  The actual underlying storage system is
undefined, and can be plugged in by implementing 7 small interfaces:

  *  Database
  *  RepositoryIndexTable
  *  RepositoryTable
  *  RefTable
  *  ChunkTable
  *  ObjectIndexTable
  *  WriteBuffer

The storage provider interface tries to assume very little about the
underlying storage system, and requires only three key features:

  *  key -> value lookup (a hashtable is suitable)
  *  atomic updates on single rows
  *  asynchronous operations (Java's ExecutorService is easy to use)

Most NoSQL database products offer all 3 of these features in their
clients, and so does any decent network based cache system like the
open source memcache product.  Relying only on key equality for data
retrevial makes it simple for the storage engine to distribute across
multiple machines.  Traditional SQL systems could also be used with a
JDBC based spi implementation.

Before submitting this change I have implemented six storage systems
for the spi layer:

  * Apache HBase[1]
  * Apache Cassandra[2]
  * Google Bigtable[3]
  * an in-memory implementation for unit testing
  * a JDBC implementation for SQL
  * a generic cache provider that can ride on top of memcache

All six systems came in with an spi layer around 1000 lines of code to
implement the above 7 interfaces.  This is a huge reduction in size
compared to prior attempts to implement a new JGit storage layer.  As
this package shows, a complete JGit storage implementation is more
than 17,000 lines of fairly complex code.

A simple cache is provided in storage.dht.spi.cache.  Implementers can
use CacheDatabase to wrap any other type of Database and perform fast
reads against a network based cache service, such as the open source
memcached[4].  An implementation of CacheService must be provided to
glue this spi onto the network cache.

[1] https://github.com/spearce/jgit_hbase
[2] https://github.com/spearce/jgit_cassandra
[3] http://labs.google.com/papers/bigtable.html
[4] http://memcached.org/

Change-Id: I0aa4072781f5ccc019ca421c036adff2c40c4295
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Updates the project level settings to run the formatter
on save on only on the edited lines.

Change-Id: I26dd69d0c95e6d73f9fdf7031f3c1dbf3becbb79
Signed-off-by: Chris Aniszczyk <caniszczyk@gmail.com>

We call it "JGit Format", not "JGit".

Change-Id: Idd20557d21fe20602c00a60bfeaea78d3c95fe5e
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Our project coding conventions do not want trailing whitespace at
the end of a source code line.  Configure Eclipse to automatically
remove them when saving any Java source file.

Change-Id: I9701366b3b1240879761b30556e6ff416e969e1d
Reviewed-by: Mykola Nikishov <mn@mn.com.ua>
Reviewed-by: Alex Blewitt <alex.blewitt@gmail.com>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

Per CQ 3448 this is the initial contribution of the JGit project
to eclipse.org.  It is derived from the historical JGit repository
at commit 3a2dd9921c.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>