1 files changed, 38 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/packages/SkylarkExportable.java b/src/main/java/com/google/devtools/build/lib/packages/SkylarkExportable.java
new file mode 100644
index 0000000000..003baa946d
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/packages/SkylarkExportable.java
@@ -0,0 +1,38 @@
+// Copyright 2016 The Bazel Authors. 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.lib.packages;
+
+import com.google.devtools.build.lib.cmdline.Label;
+import com.google.devtools.build.lib.skylarkinterface.SkylarkValue;
+import com.google.devtools.build.lib.syntax.EvalException;
+
+/**
+ * {@link SkylarkValue}s that need special handling when they are
+ * exported from an extension file. For example, rule definitions
+ * receive their name at the end of the execution of the .bzl file.
+ */
+public interface SkylarkExportable extends SkylarkValue {
+
+  /**
+   * Is this value already exported?
+   */
+  boolean isExported();
+
+  /**
+   * Notify the value that it is exported from {@code extensionLabel}
+   * extension with name {@code exportedName}.
+   */
+  void export(Label extensionLabel, String exportedName) throws EvalException;
+}