public String produceFeatureElement(
     FeatureTreeNode feature, Map featureData, String templateFileName) {
   String output = "";
   try {
     if (featureElementTemplate == null) {
       featureElementTemplate = cfg.getTemplate(templateFileName);
     }
     featureData.putAll(produceBasicFeatureData(feature));
     FeatureTreeNode parentNode =
         (FeatureTreeNode) ((feature instanceof FeatureGroup) ? feature.getParent() : feature);
     List children = new ArrayList(parentNode.getChildCount());
     for (int i = 0; i < parentNode.getChildCount(); i++) {
       FeatureTreeNode childNode = (FeatureTreeNode) parentNode.getChildAt(i);
       if (childNode instanceof FeatureGroup) {
         for (int j = 0; j < childNode.getChildCount(); j++) {
           FeatureTreeNode groupedNode = (FeatureTreeNode) childNode.getChildAt(j);
           children.add(produceBasicFeatureData(groupedNode));
         }
       } else {
         children.add(produceBasicFeatureData(childNode));
       }
     }
     featureData.put("children", children);
     StringWriter outputWriter = new StringWriter();
     featureElementTemplate.process(featureData, outputWriter);
     output = outputWriter.toString();
   } catch (Exception e) {
     output = e.getMessage();
   }
   return output;
 }
  protected void extractComponentsFromFeatureModel(FeatureTreeNode featureNode) {

    if (featureNode.isLeaf()) {
      if (getParentNode(featureNode) != null) {
        String componentKey = getParentNode(featureNode).getID();
        String componentName = getParentNode(featureNode).getName();
        ProductComponent component = concreteComponents.get(componentKey);
        if (component == null) {
          component = new ProductComponent(componentKey, componentName);
          concreteComponents.put(componentKey, component);
        }
        component.addComponentType(featureNode.getID());
      }
    }

    for (int i = 0; i < featureNode.getChildCount(); i++) {
      extractComponentsFromFeatureModel((FeatureTreeNode) featureNode.getChildAt(i));
    }
  }