1 files changed, 31 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/skyframe/MinimalVersion.java b/src/main/java/com/google/devtools/build/skyframe/MinimalVersion.java
new file mode 100644
index 0000000000..6f75c1546e
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/skyframe/MinimalVersion.java
@@ -0,0 +1,31 @@
+// 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;
+
+/**
+ * A Version "less than" all other versions, other than itself.
+ *
+ * <p>Only use in custom evaluator implementations.
+ */
+public class MinimalVersion implements Version {
+  public static final MinimalVersion INSTANCE = new MinimalVersion();
+
+  private MinimalVersion() {
+  }
+
+  @Override
+  public boolean atMost(Version other) {
+    return true;
+  }
+}