Update to latest JGit to get AdvertiseRefsHook

Convert VisibleRefFilter and ReceiveCommitsRefFilter to be
AdvertiseRefsHooks. For now, the basic functionality remains the same.

Change-Id: I415c54c8a5ee657f41e5ff2ca4a8f9c7b7a16c1b

gerrit-server/src/main/java/com/google/gerrit/server/git/ReceiveCommitsAdvertiseRefsHook.java

@@ -0,0 +1,54 @@
+// Copyright (C) 2010 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.git;
+
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.transport.AdvertiseRefsHook;
+import org.eclipse.jgit.transport.ReceivePack;
+import org.eclipse.jgit.transport.ServiceMayNotContinueException;
+import org.eclipse.jgit.transport.UploadPack;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/** Exposes only the non refs/changes/ reference names. */
+class ReceiveCommitsAdvertiseRefsHook implements AdvertiseRefsHook {
+  private final AdvertiseRefsHook base;
+
+  public ReceiveCommitsAdvertiseRefsHook(AdvertiseRefsHook base) {
+    this.base = base != null ? base : AdvertiseRefsHook.DEFAULT;
+  }
+
+  @Override
+  public void advertiseRefs(UploadPack us) {
+    throw new UnsupportedOperationException(
+        "ReceiveCommitsAdvertiseRefsHook cannot be used for UploadPack");
+  }
+
+  @Override
+  public void advertiseRefs(ReceivePack rp) {
+    Map<String, Ref> oldRefs = rp.getAdvertisedRefs();
+    if (oldRefs == null) {
+      oldRefs = rp.getRepository().getAllRefs();
+    }
+    HashMap<String, Ref> r = new HashMap<String, Ref>();
+    for (Map.Entry<String, Ref> e : oldRefs.entrySet()) {
+      if (!e.getKey().startsWith("refs/changes/")) {
+        r.put(e.getKey(), e.getValue());
+      }
+    }
+    rp.setAdvertisedRefs(r, rp.getAdvertisedObjects());
+  }
+}