[JGIT PATCH 4/4] Use a singleton for the NullProgressMonitor implementation

["Shawn O. Pearce" <spearce@spearce.org>]

No reason to create a new instance every time we need to shove
a null monitor into a variable because someone passed us null.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
---
 .../org/spearce/jgit/lib/NullProgressMonitor.java  |    3 +++
 .../src/org/spearce/jgit/util/TemporaryBuffer.java |    2 +-
 2 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/org.spearce.jgit/src/org/spearce/jgit/lib/NullProgressMonitor.java b/org.spearce.jgit/src/org/spearce/jgit/lib/NullProgressMonitor.java
index de75b90..191dc00 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/lib/NullProgressMonitor.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/lib/NullProgressMonitor.java
@@ -42,6 +42,9 @@ package org.spearce.jgit.lib;
  * A NullProgressMonitor does not report progress anywhere.
  */
 public class NullProgressMonitor implements ProgressMonitor {
+	/** Immutable instance of a null progress monitor. */
+	public static final NullProgressMonitor INSTANCE = new NullProgressMonitor();
+
 	public void start(int totalTasks) {
 		// Do not report.
 	}
diff --git a/org.spearce.jgit/src/org/spearce/jgit/util/TemporaryBuffer.java b/org.spearce.jgit/src/org/spearce/jgit/util/TemporaryBuffer.java
index 20db580..d597c38 100644
--- a/org.spearce.jgit/src/org/spearce/jgit/util/TemporaryBuffer.java
+++ b/org.spearce.jgit/src/org/spearce/jgit/util/TemporaryBuffer.java
@@ -200,7 +200,7 @@ public class TemporaryBuffer extends OutputStream {
 	public void writeTo(final OutputStream os, ProgressMonitor pm)
 			throws IOException {
 		if (pm == null)
-			pm = new NullProgressMonitor();
+			pm = NullProgressMonitor.INSTANCE;
 		if (blocks != null) {
 			// Everything is in core so we can stream directly to the output.
 			//
-- 
1.5.6.74.g8a5e