[apps] create a class Node

Change-Id: I8e1270bab5e4b121cb49750299c7d726c5bbb8d0

apps/node.cpp

@@ -0,0 +1,21 @@
+#include "node.h"
+
+const Node * Node::children(int index) const {
+  return &m_children[index];
+}
+
+int Node::numberOfChildren() {
+  return m_numberOfChildren;
+}
+
+const char * Node::label() const {
+  return m_label;
+}
+
+const char * Node::text() const {
+  return m_text;
+}
+
+bool Node::isNull() {
+  return (m_label == nullptr);
+}