private static GridConstraints processDefaultConstraintsElement(final @NotNull Element element) {
    final GridConstraints constraints = new GridConstraints();

    // grid related attributes
    constraints.setVSizePolicy(LwXmlReader.getRequiredInt(element, ATTRIBUTE_VSIZE_POLICY));
    constraints.setHSizePolicy(LwXmlReader.getRequiredInt(element, ATTRIBUTE_HSIZE_POLICY));
    constraints.setAnchor(LwXmlReader.getRequiredInt(element, ATTRIBUTE_ANCHOR));
    constraints.setFill(LwXmlReader.getRequiredInt(element, ATTRIBUTE_FILL));

    // minimum size
    final Element minSizeElement = element.getChild(ELEMENT_MINIMUM_SIZE);
    if (minSizeElement != null) {
      constraints.myMinimumSize.width = LwXmlReader.getRequiredInt(minSizeElement, ATTRIBUTE_WIDTH);
      constraints.myMinimumSize.height = LwXmlReader.getRequiredInt(minSizeElement, ATTRIBUTE_HEIGHT);
    }

    // preferred size
    final Element prefSizeElement = element.getChild(ELEMENT_PREFERRED_SIZE);
    if (prefSizeElement != null) {
      constraints.myPreferredSize.width = LwXmlReader.getRequiredInt(prefSizeElement, ATTRIBUTE_WIDTH);
      constraints.myPreferredSize.height = LwXmlReader.getRequiredInt(prefSizeElement, ATTRIBUTE_HEIGHT);
    }

    // maximum size
    final Element maxSizeElement = element.getChild(ELEMENT_MAXIMUM_SIZE);
    if (maxSizeElement != null) {
      constraints.myMaximumSize.width = LwXmlReader.getRequiredInt(maxSizeElement, ATTRIBUTE_WIDTH);
      constraints.myMaximumSize.height = LwXmlReader.getRequiredInt(maxSizeElement, ATTRIBUTE_HEIGHT);
    }

    return constraints;
  }
private static GridConstraints processDefaultConstraintsElement(final @NotNull Element element)