ModifyUserHistoryTag.java 文件源码

/**
 * Process the start tag for this instance.
 */
@Override
public int doStartTag() throws JspTagException {
  // only do anything if valid user object exists
  UserIF user = FrameworkUtils.getUser(pageContext);
  HistoryMap history = user.getHistory();
  if (history != null) {
    Object obj = pageContext.findAttribute(objectName);
    // log.debug("Found object " + obj );
    if (obj != null) {
      if (opName.equals(OP_ADD))
        history.add(obj);
      else
        history.removeEntry(obj);
    } else
      log.info("Could not find object by name '" + objectName + "'.");
  } else
    log.info("No history attached to user object");
  // empty tag has not to eval anything
  return SKIP_BODY;
}