PackBitmapIndex: convert from class to interface

This abstract class can be an interface after
https://review.gerrithub.io/c/eclipse-jgit/jgit/+/1184614 moved the
packChecksum data behind a getter interface. This also allows easier
overriding of this interface with custom types.

Change-Id: I89851de678e7ff896cc086455907e2898d2eecf6

3 files changed, 5 insertions, 5 deletions

diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java
index c2b3926309..5f979b0daa 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/BasePackBitmapIndex.java
@@ -18,7 +18,7 @@ import com.googlecode.javaewah.EWAHCompressedBitmap;
 /**
  * Base implementation of the PackBitmapIndex.
  */
-abstract class BasePackBitmapIndex extends PackBitmapIndex {
+abstract class BasePackBitmapIndex implements PackBitmapIndex {
 	private final ObjectIdOwnerMap<StoredBitmap> bitmaps;
 
 	BasePackBitmapIndex(ObjectIdOwnerMap<StoredBitmap> bitmaps) {
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndex.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndex.java
index affd2c0761..4c3f6c1eb4 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndex.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndex.java
@@ -35,7 +35,7 @@ import com.googlecode.javaewah.EWAHCompressedBitmap;
  * {@link #findPosition(AnyObjectId)} can be used to build other bitmaps that a
  * compatible with the encoded bitmaps available from the index.
  */
-public abstract class PackBitmapIndex {
+public interface PackBitmapIndex {
 	/** Flag bit denoting the bitmap should be reused during index creation. */
 	public static final int FLAG_REUSE = 1;
 
@@ -137,7 +137,7 @@ public abstract class PackBitmapIndex {
 	 *
 	 * @return checksum as a byte array
 	 */
-	byte[] getPackChecksum() {
+	default byte[] getPackChecksum() {
 		return null;
 	}
 
diff --git a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java
index bb7cfd0464..ffbc0737ac 100644
--- a/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java
+++ b/org.eclipse.jgit/src/org/eclipse/jgit/internal/storage/file/PackBitmapIndexRemapper.java
@@ -28,8 +28,8 @@ import com.googlecode.javaewah.IntIterator;
  * implementations this implementation is not thread safe, as it is intended to
  * be used with a PackBitmapIndexBuilder, which is also not thread safe.
  */
-public class PackBitmapIndexRemapper extends PackBitmapIndex
-		implements Iterable<PackBitmapIndexRemapper.Entry> {
+public class PackBitmapIndexRemapper
+		implements PackBitmapIndex, Iterable<PackBitmapIndexRemapper.Entry> {
 
 	private final BasePackBitmapIndex oldPackIndex;
 	final PackBitmapIndex newPackIndex;