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[JGIT PATCH 02/23] Add MutableObjectId.clear() to set the id to zeroId

From
Shawn O. Pearce <spearce@spearce.org>
Date
Dec 25, 2008, 02:10 UTC
Message-ID
<1230171079-17156-3-git-send-email-spearce@spearce.org>
In-Reply-To
<1230171079-17156-2-git-send-email-spearce@spearce.org>

This makes it easier to set any MutableObjectId to the same value as the zeroId. Its logical to ask for a ".clear()" invocation when you are writing application code, and its more efficient for the JIT if we do 5 zero writes then to perform a copy from the zeroId singleton.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../src/org/spearce/jgit/lib/MutableObjectId.java  |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)
diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/MutableObjectId.java b/org.spearce.jgit/src/org/spearce/jgit/lib/MutableObjectId.java
index 5b16345..fadebab 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/MutableObjectId.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/MutableObjectId.java
@@ -66,6 +66,15 @@ MutableObjectId(MutableObjectId src) {
 		this.w5 = src.w5;
 	}
 
+	/** Make this id match {@link ObjectId#zeroId()}. */
+	public void clear() {
+		w1 = 0;
+		w2 = 0;
+		w3 = 0;
+		w4 = 0;
+		w5 = 0;
+	}
+
 	/**
 	 * Convert an ObjectId from raw binary representation.
 	 * 
-- 
1.6.1.rc4.301.g5497a
Previous: Shawn O. PearceNext: Shawn O. Pearce
Message 3 of 26 in “Misc. performance tweaks”
  1. 00/18 Misc. performance tweaksShawn O. Pearce, Dec 25, 2008
  2. 01/23 Improve hit performance on the UnpackedObjectCacheShawn O. Pearce, Dec 25, 2008
  3. 02/23 Add MutableObjectId.clear() to set the id to zeroIdShawn O. Pearce, Dec 25, 2008
  4. 03/23 Allow TreeWalk callers to pass a MutableObjectId to get the current idShawn O. Pearce, Dec 25, 2008
  5. 04/23 Switch ObjectWalk to use the new MutableObjectId form in TreeWalkShawn O. Pearce, Dec 25, 2008
  6. 05/23 Change walker based fetch to use TreeWalk's MutableObjectId accessorShawn O. Pearce, Dec 25, 2008
  7. 06/23 Reduce garbage allocation when using TreeWalkShawn O. Pearce, Dec 25, 2008
  8. 07/23 Switch ObjectWalk to use a naked CanonicalTreeParser because its fasterShawn O. Pearce, Dec 25, 2008
  9. 08/23 Remove the unused PackFile.get(ObjectId) formShawn O. Pearce, Dec 25, 2008
  10. 09/23 Remove getId from ObjectLoader API as its unnecessary overheadShawn O. Pearce, Dec 25, 2008
  11. 10/23 Make mmap mode more reliable by forcing GC at the correct spotShawn O. Pearce, Dec 25, 2008
  12. 11/23 Rewrite WindowCache to use a hash tableShawn O. Pearce, Dec 25, 2008
  13. 12/23 Change ByteArrayWindow to read content outside of WindowCache's lockShawn O. Pearce, Dec 25, 2008
  14. 13/23 Dispose of RevCommit buffers when they aren't used in PackWriterShawn O. Pearce, Dec 25, 2008
  15. 14/23 Don't unpack delta chains while writing a pack from a pack v1 indexShawn O. Pearce, Dec 25, 2008
  16. 15/23 Don't unpack delta chains while converting delta to whole objectShawn O. Pearce, Dec 25, 2008
  17. 16/23 Defer parsing of the ObjectId while walking a PackIndex IteratorShawn O. Pearce, Dec 25, 2008
  18. 17/23 Only do one getCachedBytes per whole object writtenShawn O. Pearce, Dec 25, 2008
  19. 18/23 Correctly use a long for the offsets within a generated packShawn O. Pearce, Dec 25, 2008
  20. 19/23 Allow more direct access to determine isWrittenShawn O. Pearce, Dec 25, 2008
  21. 20/23 Move "wantWrite" field of ObjectToPack into the flags fieldShawn O. Pearce, Dec 25, 2008
  22. 21/23 Use an ArrayList for the reuseLoader collection in PackWriterShawn O. Pearce, Dec 25, 2008
  23. 22/23 Don't cut off existing delta chains if we are reusing deltasShawn O. Pearce, Dec 25, 2008
  24. 23/23 Correctly honor the thin parameter to PackWriter.writePackShawn O. Pearce, Dec 25, 2008
  25. Robin RosenbergDec 27, 2008
  26. 11/23 Rewrite WindowCache to use a hash tableShawn O. Pearce, Dec 27, 2008

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