1 files changed, 43 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/skyframe/ImmutableDiff.java b/src/main/java/com/google/devtools/build/skyframe/ImmutableDiff.java
new file mode 100644
index 0000000000..46ab29e851
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/skyframe/ImmutableDiff.java
@@ -0,0 +1,43 @@
+// Copyright 2014 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.ImmutableMap;
+
+import java.util.Map;
+
+/**
+ * Immutable implementation of {@link Differencer.Diff}.
+ */
+public class ImmutableDiff implements Differencer.Diff {
+
+  private final ImmutableList<SkyKey> valuesToInvalidate;
+  private final ImmutableMap<SkyKey, SkyValue> valuesToInject;
+
+  public ImmutableDiff(Iterable<SkyKey> valuesToInvalidate, Map<SkyKey, SkyValue> valuesToInject) {
+    this.valuesToInvalidate = ImmutableList.copyOf(valuesToInvalidate);
+    this.valuesToInject = ImmutableMap.copyOf(valuesToInject);
+  }
+
+  @Override
+  public Iterable<SkyKey> changedKeysWithoutNewValues() {
+    return valuesToInvalidate;
+  }
+
+  @Override
+  public Map<SkyKey, SkyValue> changedKeysWithNewValues() {
+    return valuesToInject;
+  }
+}