This enables higher file timestamp resolution on filesystems like ext4,
Mac APFS (1ns) or NTFS (100ns) providing high timestamp resolution on
filesystem level.

Note:
- on some OSes Java 8,9 truncate milliseconds, see
https://bugs.openjdk.java.net/browse/JDK-8177809, fixed in Java 10
- UnixFileAttributes truncates timestamp resolution to microseconds when
converting the internal representation to FileTime exposed in the API,
see https://bugs.openjdk.java.net/browse/JDK-8181493
- WindowsFileAttributes also provides only microsecond resolution

Change-Id: I25ffff31a3c6f725fc345d4ddc2f26da3b88f6f2
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Change-Id: I74616f6e8ef69bef4db2f13a9b47ddf57714fd1f
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

This is useful when comparing mtime displayed by 
    $ jgit debug-show-dir-cache -m
with mtime displayed by 
    $ git ls-files --debug 
or 
    $ stat "%m"

Change-Id: Id133ebe6f6093a56a6a6645e1c5bb18752fb2fd0
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Also update help text for the merge command now supporting recursive
strategy as the default merge strategy.

Change-Id: I07886fe875c407e2244f562c003bb9d04f398026
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

A few classes such as Constanrs are marked with @SuppressWarnings, as are
toString() methods with many liternal, but otherwise $NLS-n$ is used for
string containing text that should not be translated. A few literals may
fall into the gray zone, but mostly I've tried to only tag the obvious
ones.

Change-Id: I22e50a77e2bf9e0b842a66bdf674e8fa1692f590

Invoke the wrapper types' valueOf via static imports.
For booleans used in asserts, add a new assert in
the JUnit utility package since out current version of JUnit
does not have the assert(boolean, boolean) method.

Change-Id: I9099bd8efbc8c133479344d51ce7dabed8958a2b

The underlying problem is that System.out is a PrintWriter and
as such it does not throw exceptions on error, but rather just
sets a flag and continues.

This changes replaces the use of System.out with a PrintWriter-like
writer that does not catch error, but instead throw them to the
caller.

Bug: 366243
Change-Id: I44405edc4416e943b87f09a0f6ed041c6c51b046

The old format is hard to read.

Change-Id: I27f3a7dbd92b26256993d27d5223b743fef70902
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Change-Id: I6fb17ec7f04f8bfaf1253b2ff08200ef9fc51898
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

Instead of creating the DirCache from a static factory method, use
an instance method on Repository, permitting the implementation to
override the method with a completely different type of DirCache
reading and writing.  This would better support a repository in the
cloud strategy, or even just an in-memory unit test environment.

Change-Id: I6399894b12d6480c4b3ac84d10775dfd1b8d13e7
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>