/**
   * Return the MappingClass located at the specified node, if one exists at this node.
   *
   * @param theTreeNode
   * @return
   */
  public MappingClass getMappingClass(EObject theTreeNode) {
    CoreArgCheck.isNotNull(theTreeNode);

    return (MappingClass) mappingLocator.getMappingClass(theTreeNode);
  }