+
+ void setValidatedNode(final ModificationApplyOperation op, final Optional<? extends TreeNode> current,
+ final Optional<? extends TreeNode> node) {
+ this.validatedOp = requireNonNull(op);
+ this.validatedCurrent = requireNonNull(current);
+ this.validatedNode = requireNonNull(node);
+ }
+
+ /**
+ * Acquire pre-validated node assuming a previous operation and node. This is a counterpart to
+ * {@link #setValidatedNode(ModificationApplyOperation, Optional, Optional)}.
+ *
+ * @param op Currently-executing operation
+ * @param current Currently-used tree node
+ * @return {@code null} if there is a mismatch with previously-validated node (if present) or the result of previous
+ * validation.
+ */
+ @SuppressFBWarnings(value = "NP_OPTIONAL_RETURN_NULL",
+ justification = "The contract is package-internal and well documented, we do not need a separate wrapper")
+ @Nullable Optional<? extends TreeNode> getValidatedNode(final ModificationApplyOperation op,
+ final Optional<? extends TreeNode> current) {
+ return op.equals(validatedOp) && current.equals(validatedCurrent) ? validatedNode : null;
+ }