+ final MutableTreeNode mutable = newValueMeta.mutable();
+ mutable.setSubtreeVersion(version);
+
+ @SuppressWarnings("rawtypes")
+ final NormalizedNodeContainerBuilder dataBuilder = ImmutableUnkeyedListEntryNodeBuilder
+ .create((UnkeyedListEntryNode) newValue);
+
+ return mutateChildren(mutable, dataBuilder, version, modification.getChildren());
+ }
+
+ /**
+ * Applies write/remove diff operation for each modification child in modification subtree.
+ * Operation also sets the Data tree references for each Tree Node (Index Node) in meta (MutableTreeNode) structure.
+ *
+ * @param meta MutableTreeNode (IndexTreeNode)
+ * @param data DataBuilder
+ * @param nodeVersion Version of TreeNode
+ * @param modifications modification operations to apply
+ * @return Sealed immutable copy of TreeNode structure with all Data Node references set.
+ */
+ @SuppressWarnings({ "rawtypes", "unchecked" })
+ private TreeNode mutateChildren(final MutableTreeNode meta, final NormalizedNodeContainerBuilder data,
+ final Version nodeVersion, final Iterable<ModifiedNode> modifications) {
+
+ for (ModifiedNode mod : modifications) {
+ final PathArgument id = mod.getIdentifier();
+ final Optional<TreeNode> cm = meta.getChild(id);
+
+ Optional<TreeNode> result = resolveChildOperation(id).apply(mod, cm, nodeVersion);
+ if (result.isPresent()) {
+ final TreeNode tn = result.get();
+ meta.addChild(tn);
+ data.addChild(tn.getData());
+ } else {
+ meta.removeChild(id);
+ data.removeChild(id);
+ }
+ }
+
+ meta.setData(data.build());
+ return meta.seal();