Implement wasDeltaAttempted() in DfsObjectRepresentation.

In DFS, everything is stored in a pack but only objects in a pack with
source GC or UNREACHABLE_GARBAGE have had delta compression attempted.
Expose the PackSource setter and getter on DfsPackDescription in order
to implement wasDeltaAttempted.

Change-Id: Ie949f321147ad870f1c3f23b552343bbbda32152

org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsObjectRepresentation.java

@@ -43,7 +43,11 @@
 
 package org.eclipse.jgit.storage.dfs;
 
+import static org.eclipse.jgit.storage.dfs.DfsObjDatabase.PackSource.GC;
+import static org.eclipse.jgit.storage.dfs.DfsObjDatabase.PackSource.UNREACHABLE_GARBAGE;
+
 import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.storage.dfs.DfsObjDatabase.PackSource;
 import org.eclipse.jgit.storage.pack.ObjectToPack;
 import org.eclipse.jgit.storage.pack.StoredObjectRepresentation;
 
@@ -87,4 +91,13 @@ class DfsObjectRepresentation extends StoredObjectRepresentation {
 	public ObjectId getDeltaBase() {
 		return baseId;
 	}
+
+	@Override
+	public boolean wasDeltaAttempted() {
+		if (pack != null) {
+			PackSource source = pack.getPackDescription().getPackSource();
+			return source == GC || source == UNREACHABLE_GARBAGE;
+		}
+		return false;
+	}
 }

org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/DfsPackDescription.java

@@ -46,6 +46,7 @@ package org.eclipse.jgit.storage.dfs;
 import java.util.Set;
 
 import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.storage.dfs.DfsObjDatabase.PackSource;
 import org.eclipse.jgit.storage.pack.PackWriter;
 
 /**
@@ -61,6 +62,8 @@ public class DfsPackDescription implements Comparable<DfsPackDescription> {
 
 	private final String packName;
 
+	private PackSource packSource;
+
 	private long lastModified;
 
 	private long packSize;
@@ -114,6 +117,21 @@ public class DfsPackDescription implements Comparable<DfsPackDescription> {
 		return name.substring(0, dot) + ".idx";
 	}
 
+	/** @return the source of the pack. */
+	public PackSource getPackSource() {
+		return packSource;
+	}
+
+	/**
+	 * @param source
+	 *            the source of the pack.
+	 * @return {@code this}
+	 */
+	public DfsPackDescription setPackSource(PackSource source) {
+		packSource = source;
+		return this;
+	}
+
 	/** @return time the pack was created, in milliseconds. */
 	public long getLastModified() {
 		return lastModified;

org.eclipse.jgit/src/org/eclipse/jgit/storage/dfs/InMemoryRepository.java

@@ -76,8 +76,10 @@ public class InMemoryRepository extends DfsRepository {
 		@Override
 		protected DfsPackDescription newPack(PackSource source) {
 			int id = packId.incrementAndGet();
-			return new MemPack("pack-" + id + "-" + source.name(),
+			DfsPackDescription desc = new MemPack(
+					"pack-" + id + "-" + source.name(),
 					getRepository().getDescription());
+			return desc.setPackSource(source);
 		}
 
 		@Override