Add WalkableGraphUtils for easy (r)dep queries

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MOS_MIGRATED_REVID=102276335

1 files changed, 29 insertions, 0 deletions

diff --git a/src/test/java/com/google/devtools/build/skyframe/WalkableGraphUtils.java b/src/test/java/com/google/devtools/build/skyframe/WalkableGraphUtils.java
new file mode 100644
index 0000000000..383fb2c2a6
--- /dev/null
+++ b/src/test/java/com/google/devtools/build/skyframe/WalkableGraphUtils.java
@@ -0,0 +1,29 @@
+// Copyright 2015 Google Inc. All rights reserved.
+//
+// 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.devtools.build.skyframe;
+
+import com.google.common.collect.ImmutableList;
+import com.google.common.collect.Iterables;
+
+/** Utility methods for querying (r)deps of nodes from {@link WalkableGraph}s more concisely. */
+public class WalkableGraphUtils {
+
+  public static Iterable<SkyKey> getDirectDeps(WalkableGraph graph, SkyKey key) {
+    return Iterables.getOnlyElement(graph.getDirectDeps(ImmutableList.of(key)).values());
+  }
+
+  public static Iterable<SkyKey> getReverseDeps(WalkableGraph graph, SkyKey key) {
+    return Iterables.getOnlyElement(graph.getReverseDeps(ImmutableList.of(key)).values());
+  }
+}