Move BaseReceivePack#walk getter to ReceivePack

Another step toward merging BaseReceivePack into ReceivePack.

Change-Id: I43cf2e36e2d5b0cd85bf23c81469909c14757b63
Signed-off-by: Jonathan Nieder <jrn@google.com>
Signed-off-by: Matthias Sohn <matthias.sohn@sap.com>

org.eclipse.jgit/.settings/.api_filters

@@ -43,6 +43,12 @@
                 <message_argument value="getRepository()"/>
             </message_arguments>
         </filter>
+        <filter id="421650549">
+            <message_arguments>
+                <message_argument value="org.eclipse.jgit.transport.BaseReceivePack"/>
+                <message_argument value="getRevWalk()"/>
+            </message_arguments>
+        </filter>
         <filter id="421650549">
             <message_arguments>
                 <message_argument value="org.eclipse.jgit.transport.BaseReceivePack"/>

org.eclipse.jgit/src/org/eclipse/jgit/transport/BaseReceivePack.java

@@ -154,7 +154,7 @@ public abstract class BaseReceivePack {
 	final Repository db;
 
 	/** Revision traversal support over {@link #db}. */
-	private final RevWalk walk;
+	final RevWalk walk;
 
 	/**
 	 * Is the client connection a bi-directional socket or pipe?
@@ -430,10 +430,10 @@ public abstract class BaseReceivePack {
 	 * Get the RevWalk instance used by this connection.
 	 *
 	 * @return the RevWalk instance used by this connection.
+	 * @deprecated use {@link ReceivePack#getRevWalk}
 	 */
-	public final RevWalk getRevWalk() {
+	@Deprecated
-		return walk;
+	public abstract RevWalk getRevWalk();
-	}
 
 	/**
 	 * Get refs which were advertised to the client.

org.eclipse.jgit/src/org/eclipse/jgit/transport/ReceivePack.java

@@ -60,6 +60,7 @@ import org.eclipse.jgit.lib.ConfigConstants;
 import org.eclipse.jgit.lib.Constants;
 import org.eclipse.jgit.lib.NullProgressMonitor;
 import org.eclipse.jgit.lib.Repository;
+import org.eclipse.jgit.revwalk.RevWalk;
 import org.eclipse.jgit.transport.ReceiveCommand.Result;
 import org.eclipse.jgit.transport.RefAdvertiser.PacketLineOutRefAdvertiser;
 
@@ -102,6 +103,16 @@ public class ReceivePack extends BaseReceivePack {
 		return db;
 	}
 
+	/**
+	 * Get the RevWalk instance used by this connection.
+	 *
+	 * @return the RevWalk instance used by this connection.
+	 */
+	@Override
+	public final RevWalk getRevWalk() {
+		return walk;
+	}
+
 	/**
 	 * Get the push certificate used to verify the pusher's identity.
 	 * <p>