How to use

IdDefRefMapperBase

in

org.jibx.extras

String id = getIdValue(obj);
Object value = map.get(id);
if (value == null) {
  ctx.attribute(0, getAttributeName(), id);
  ctx.closeStartEmpty();

  public Object unmarshal(Object obj, IUnmarshallingContext ictx)
    throws JiBXException {
    
    // make sure we're at the appropriate start tag
    UnmarshallingContext ctx = (UnmarshallingContext)ictx;
    if (!ctx.isAt(m_uri, m_name)) {
      return null;
    } else {
      
      // check for reference to existing ID
      String id = ctx.attributeText(null, getAttributeName(), null);
      if (id == null) {
        
        // no ID value supplied, unmarshal full definition
        obj = ctx.unmarshalElement();
        
      } else {
        
        // find object based on ID
        obj = ctx.findID(id, 0);
        ctx.parsePastEndTag(m_uri, m_name);
        if (obj == null) {
          ctx.throwStartTagException("Reference to undefined ID " +
            id);
        }
      }
    }
    return obj;
  }
}