1 files changed, 92 insertions, 0 deletions
diff --git a/java/com/google/gerrit/server/git/TagMatcher.java b/java/com/google/gerrit/server/git/TagMatcher.java
new file mode 100644
index 0000000000..58b4b8b2b8
--- /dev/null
+++ b/java/com/google/gerrit/server/git/TagMatcher.java
@@ -0,0 +1,92 @@
+// Copyright (C) 2011 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 com.google.gerrit.server.git.TagSet.Tag;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.BitSet;
+import java.util.Collection;
+import java.util.List;
+import org.eclipse.jgit.lib.ObjectId;
+import org.eclipse.jgit.lib.Ref;
+import org.eclipse.jgit.lib.Repository;
+
+public class TagMatcher {
+  final BitSet mask = new BitSet();
+  final List<Ref> newRefs = new ArrayList<>();
+  final List<LostRef> lostRefs = new ArrayList<>();
+  final TagSetHolder holder;
+  final TagCache cache;
+  final Repository db;
+  final Collection<Ref> include;
+  TagSet tags;
+  final boolean updated;
+  private boolean rebuiltForNewTags;
+
+  TagMatcher(
+      TagSetHolder holder,
+      TagCache cache,
+      Repository db,
+      Collection<Ref> include,
+      TagSet tags,
+      boolean updated) {
+    this.holder = holder;
+    this.cache = cache;
+    this.db = db;
+    this.include = include;
+    this.tags = tags;
+    this.updated = updated;
+  }
+
+  public boolean isReachable(Ref tagRef) {
+    try {
+      tagRef = db.getRefDatabase().peel(tagRef);
+    } catch (IOException e) {
+      // Ignore
+    }
+
+    ObjectId tagObj = tagRef.getPeeledObjectId();
+    if (tagObj == null) {
+      tagObj = tagRef.getObjectId();
+      if (tagObj == null) {
+        return false;
+      }
+    }
+
+    Tag tag = tags.lookupTag(tagObj);
+    if (tag == null) {
+      if (rebuiltForNewTags) {
+        return false;
+      }
+
+      rebuiltForNewTags = true;
+      holder.rebuildForNewTags(cache, this);
+      return isReachable(tagRef);
+    }
+
+    return tag.has(mask);
+  }
+
+  static class LostRef {
+    final Tag tag;
+    final int flag;
+
+    LostRef(Tag tag, int flag) {
+      this.tag = tag;
+      this.flag = flag;
+    }
+  }
+}