1 files changed, 10 insertions, 1 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/packages/AttributeContainer.java b/src/main/java/com/google/devtools/build/lib/packages/AttributeContainer.java
index 15917f6b8b..8c5bfffaa6 100644
--- a/src/main/java/com/google/devtools/build/lib/packages/AttributeContainer.java
+++ b/src/main/java/com/google/devtools/build/lib/packages/AttributeContainer.java
@@ -13,6 +13,7 @@
 // limitations under the License.
 package com.google.devtools.build.lib.packages;
 
+import com.google.common.base.Function;
 import com.google.devtools.build.lib.events.Location;
 
 import java.util.BitSet;
@@ -46,7 +47,7 @@ public class AttributeContainer {
   /**
    * Create a container for a rule of the given rule class.
    */
-  AttributeContainer(RuleClass ruleClass) {
+  public AttributeContainer(RuleClass ruleClass) {
    this(ruleClass, new Location[ruleClass.getAttributeCount()]);
   }
   
@@ -117,4 +118,12 @@ public class AttributeContainer {
     Integer index = ruleClass.getAttributeIndex(attribute.getName());
     attributeLocations[index] = location;
   }
+
+  public static final Function<RuleClass, AttributeContainer> ATTRIBUTE_CONTAINER_FACTORY =
+      new Function<RuleClass, AttributeContainer>() {
+        @Override
+        public AttributeContainer apply(RuleClass ruleClass) {
+          return new AttributeContainer(ruleClass);
+        }
+      };
 }