私有方法七

 /**     * @author : lKF35745     * @version: 1.0     * <p>时间 : 2011-1-18</p>     * <p>描述 : 获取DstScreen的所有父节点会议ID（包括自己）</p>     * <p>Copyright 1988-2005, Huawei Tech. Co., Ltd.</p>     * @return List<String> 会议集合列表     */    private List<String> getDstScreenParentConferID(            CascadeTopoTree cascadeTree, String dstScreenConferID)    {        if (logger.isDebugEnabled())        {            logger.debug("begin to getDstScreenParentConferID and ConferID is "                    + dstScreenConferID);        }                //得到DstScreen视频源的所有父节点会议ID        List<String> dstScreenParentConferID = findParentNodeByConferenceID(                dstScreenConferID, cascadeTree);        if (null == dstScreenParentConferID                || dstScreenParentConferID.size() < 1)        {            logger.warn("this dstScreenParentConferID List is empty ");            return null;        }        if (logger.isDebugEnabled())        {            logger.debug("end to getDstScreenParentConferID and result size is"                    + dstScreenParentConferID.size());        }        return dstScreenParentConferID;    }

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