Merge "Fixes Bug 2935"

[controller.git] / opendaylight / md-sal / sal-binding-api / src / main / java / org / opendaylight / controller / md / sal / binding / api / DataObjectModification.java

diff --git a/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/md/sal/binding/api/DataObjectModification.java b/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/md/sal/binding/api/DataObjectModification.java
index 678ac34e39d25d54fc12316fc17df1d51c5ed28f..3dc6e4030f56953620ab8762ecae7c32d4ffbd74 100644 (file)
--- a/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/md/sal/binding/api/DataObjectModification.java
+++ b/opendaylight/md-sal/sal-binding-api/src/main/java/org/opendaylight/controller/md/sal/binding/api/DataObjectModification.java
@@ -65,7 +65,17 @@ public interface DataObjectModification<T extends DataObject> extends org.openda
     @Nonnull ModificationType getModificationType();
 
     /**
-     * Returns after state of top level container.
+     * Returns before-state of top level container. Implementations are encouraged,
+     * but not required to provide this state.
+     *
+     * @param root Class representing data container
+     * @return State of object before modification. Null if subtree was not present,
+     *         or the implementation cannot provide the state.
+     */
+    @Nullable T getDataBefore();
+
+    /**
+     * Returns after-state of top level container.
      *
      * @param root Class representing data container
      * @return State of object after modification. Null if subtree is not present.