1 files changed, 47 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/packages/RuleErrorConsumer.java b/src/main/java/com/google/devtools/build/lib/packages/RuleErrorConsumer.java
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index 0000000000..84d00c04ee
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+++ b/src/main/java/com/google/devtools/build/lib/packages/RuleErrorConsumer.java
@@ -0,0 +1,47 @@
+// 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.lib.packages;
+
+/**
+ * A thin interface exposing only the warning and error reporting functionality
+ * of a rule.
+ *
+ * <p>When a class or a method needs only this functionality but not the whole
+ * {@code RuleConfiguredTarget}, it can use this thin interface instead.
+ *
+ * <p>This interface should only be implemented by {@code RuleConfiguredTarget}
+ * and its subclasses.
+ */
+public interface RuleErrorConsumer {
+  /**
+   * Consume a non-attribute-specific warning in a rule.
+   */
+  void ruleWarning(String message);
+
+  /**
+   * Consume a non-attribute-specific error in a rule.
+   */
+  void ruleError(String message);
+
+  /**
+   * Consume an attribute-specific warning in a rule.
+   */
+  void attributeWarning(String attrName, String message);
+
+  /**
+   * Consume an attribute-specific error in a rule.
+   */
+  void attributeError(String attrName, String message);
+}