Listing 8. OrderReferenceHandler Implementation

/**
 * This handler constructs a List of references from the reference elements
 */
class OrderReferenceHandler implements SAXTagHandler
{
  public void onStartTag(String argTagNamespace, String argLocalTagName,
    String argQName, Attributes argAttributes, StringBuffer argText,
    Map argContext, NamespaceContext argNamespaceContext)
    throws SAXException
  {
    // clear any previous state
    argContext.put(OrderConstants.ORDER_REFERENCE_TYPE_TAG, null);
    argContext.put(OrderConstants.ORDER_REFERENCE_NUM_TAG, null);
    argContext.put(OrderConstants.ORDER_REFERENCE_DESC_TAG, null);
  }


  public void onEndTag(String argTagNamespace, String argLocalTagName,
    String argQName, Map argContext, NamespaceContext argNamespaceContext)
    throws SAXException
  {
    String type = (String)
      argContext.get(OrderConstants.ORDER_REFERENCE_TYPE_TAG);
    String ref = (String)
      argContext.get(OrderConstants.ORDER_REFERENCE_NUM_TAG);
    String desc = (String)
      argContext.get(OrderConstants.ORDER_REFERENCE_DESC_TAG);
    OrderReference newRef = new OrderReference(type, ref, desc);
    List list = (List) argContext.get(OrderConstants.ORDER_REFERENCE_TAG);
    if (null == list)
    {
      list = new LinkedList();
      argContext.put(OrderConstants.ORDER_REFERENCE_TAG, list);
    }
    list.add(newRef);
  }
}