add propertyNamesSpliterator

src/main/java/tools/jackson/core/TreeNode.java

@@ -6,6 +6,7 @@
 package tools.jackson.core;
 
 import java.util.Iterator;
+import java.util.Spliterator;
 
 /**
  * Marker interface used to denote JSON Tree nodes, as far as
@@ -227,6 +228,17 @@ public interface TreeNode
      */
     Iterator<String> propertyNames();
 
+    /**
+     * Method for accessing names of all properties for this node via a <code>Spliterator</code> ,
+     * if (and only if) this node is an Object node. Number of property names accessible
+     * will be {@link #size}.
+     *
+     * @return A <code>Spliterator</code> for traversing names of all properties this Object node
+     *   has (if Object node); empty {@link Spliterator} otherwise (never {@code null}).
+     * @since 3.0
+     */
+    Spliterator<String> propertyNamesSpliterator();
+
     /**
      * Method for locating node specified by given JSON pointer instances.
      * Method will never return null; if no matching node exists,

src/test/java/tools/jackson/core/util/DelegatesTest.java

@@ -4,6 +4,7 @@
 import java.math.BigDecimal;
 import java.math.BigInteger;
 import java.util.Iterator;
+import java.util.Spliterator;
 
 import org.junit.jupiter.api.Test;
 
@@ -96,6 +97,11 @@ public Iterator<String> propertyNames() {
             return null;
         }
 
+        @Override
+        public Spliterator<String> propertyNamesSpliterator() {
+            return null;
+        }
+
         @Override
         public TreeNode at(JsonPointer ptr) {
             return null;