BitmapWalkListener: Add method and rename for commits

During the walk, the commit can be either
1. already in the walk bitmap
2. unvisited so far with bitmap in the bitmap index
3. unvisited so far without bitmap in the bitmap index

Expose these three states in the interface. This makes the interface
easier to explain: it reports the commits found during the walk.

As it is all about commits, rename the methods to onCommit***.

Change-Id: I661f303eb22d3e735b0e439f16df7ace612376d9

org.eclipse.jgit/src/org/eclipse/jgit/revwalk/BitmapWalker.java

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/BitmapWalker.java b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/BitmapWalker.java
index 5060823..2218462 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/BitmapWalker.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/revwalk/BitmapWalker.java
@@ -48,29 +48,39 @@ public final class BitmapWalker {
 	private Bitmap prevBitmap;
 
 	/**
-	 * Report events happening during the walk.
+	 * Report commits found during the walk
 	 *
 	 * @since 6.8
 	 */
 	public interface BitmapWalkListener {
-
 		/**
-		 * The object is in the walk, and it has a bitmap
+		 * The commit is already in the walk bitmap
 		 *
 		 * @param oid
-		 *            objectId with a bitmap in the bitmap index
+		 *            objectId of the commit already in bitmap
 		 */
-		default void onBitmapFound(ObjectId oid) {
+		default void onCommitInBitmap(ObjectId oid) {
 			// Nothing to do
 		}
 
 		/**
-		 * The object is in the walk but doesn't have bitmap
+		 * The commit has a bitmap in the bitmap index
 		 *
 		 * @param oid
-		 *            objectId without a bitmap in the bitmap index
+		 *            objectId of the commit with a bitmap in the bitmap index
 		 */
-		default void onBitmapNotFound(ObjectId oid) {
+		default void onCommitWithBitmap(ObjectId oid) {
+			// Nothing to do
+		}
+
+		/**
+		 * The commit doesn't have bitmap
+		 *
+		 * @param oid
+		 *            objectId of the commit without a bitmap in the bitmap
+		 *            index
+		 */
+		default void onCommitWithoutBitmap(ObjectId oid) {
 			// Nothing to do
 		}
 	}
@@ -195,7 +205,7 @@ public BitmapBuilder findObjects(Iterable<? extends ObjectId> start, BitmapBuild
 			Bitmap bitmap = bitmapIndex.getBitmap(obj);
 			if (bitmap != null) {
 				result.or(bitmap);
-				listener.onBitmapFound(obj);
+				listener.onCommitWithBitmap(obj);
 			}
 		}
 
@@ -236,7 +246,7 @@ private BitmapBuilder findObjectsWalk(Iterable<? extends ObjectId> start, Bitmap
 			Bitmap bitmap = bitmapIndex.getBitmap(obj);
 			if (bitmap != null) {
 				bitmapResult.or(bitmap);
-				listener.onBitmapFound(obj);
+				listener.onCommitWithBitmap(obj);
 			}
 		}
 
@@ -279,7 +289,7 @@ private BitmapBuilder findObjectsWalk(Iterable<? extends ObjectId> start, Bitmap
 				// of bitmaps.
 				pm.update(1);
 				countOfBitmapIndexMisses++;
-				listener.onBitmapNotFound(oid);
+				listener.onCommitWithoutBitmap(oid);
 			}
 
 			RevObject ro;