BUG-509: Refactor listener walking

[controller.git] / opendaylight / md-sal / sal-dom-broker / src / main / java / org / opendaylight / controller / md / sal / dom / store / impl / tree / data / NoopDataTreeCandidate.java

diff --git a/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/tree/data/NoopDataTreeCandidate.java b/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/tree/data/NoopDataTreeCandidate.java
index 1782da2835df6be2f13c0c5d9b76dfc4ea357aa2..8a467484141bf9631cd05b26ae09b85f1943d6fd 100644 (file)
--- a/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/tree/data/NoopDataTreeCandidate.java
+++ b/opendaylight/md-sal/sal-dom-broker/src/main/java/org/opendaylight/controller/md/sal/dom/store/impl/tree/data/NoopDataTreeCandidate.java
@@ -7,25 +7,52 @@
  */
 package org.opendaylight.controller.md.sal.dom.store.impl.tree.data;
 
+import java.util.Collections;
+
+import org.opendaylight.controller.md.sal.dom.store.impl.tree.DataTreeCandidateNode;
+import org.opendaylight.controller.md.sal.dom.store.impl.tree.ModificationType;
 import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier;
+import org.opendaylight.yangtools.yang.data.api.InstanceIdentifier.PathArgument;
+import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
+
+import com.google.common.base.Optional;
+import com.google.common.base.Preconditions;
 
 final class NoopDataTreeCandidate extends AbstractDataTreeCandidate {
-       protected NoopDataTreeCandidate(final InstanceIdentifier rootPath, final NodeModification modificationRoot) {
-               super(rootPath, modificationRoot);
-       }
-
-       @Override
-       public void close() {
-               // NO-OP
-       }
-
-       @Override
-       public StoreMetadataNode getBeforeRoot() {
-               return null;
-       }
-
-       @Override
-       public StoreMetadataNode getAfterRoot() {
-               return null;
-       }
+    private static final DataTreeCandidateNode ROOT = new DataTreeCandidateNode() {
+        @Override
+        public ModificationType getModificationType() {
+            return ModificationType.UNMODIFIED;
+        }
+
+        @Override
+        public Iterable<DataTreeCandidateNode> getChildNodes() {
+            return Collections.emptyList();
+        }
+
+        @Override
+        public PathArgument getIdentifier() {
+            throw new IllegalStateException("Attempted to read identifier of the no-operation change");
+        }
+
+        @Override
+        public Optional<NormalizedNode<?, ?>> getDataAfter() {
+            return Optional.absent();
+        }
+
+        @Override
+        public Optional<NormalizedNode<?, ?>> getDataBefore() {
+            return Optional.absent();
+        }
+    };
+
+    protected NoopDataTreeCandidate(final InstanceIdentifier rootPath, final NodeModification modificationRoot) {
+        super(rootPath);
+        Preconditions.checkArgument(modificationRoot.getModificationType() == ModificationType.UNMODIFIED);
+    }
+
+    @Override
+    public DataTreeCandidateNode getRootNode() {
+        return ROOT;
+    }
 }