code: private static boolean isValidPropertyClass(final PropertyDescriptor _property) {
          final Class type = _property.getPropertyType();
          return Number.class.isAssignableFrom(type) || type == String.class || Date.class.isAssignableFrom(type) || type == Boolean.class;
      }
docs: Checks if a property's type is valid to be included in the report.
  @param _property the property.
  @return true if the property is is of a valid type.