OAF 清空指定控件或区域的值

if (pageContext.getParameter("ClearBtn") != null) {
            clearRegion(pageContext, webBean, "SearchPanelRN");
            String[] webBeanStr = new String[]{ "ProjectSetIdSch",  "ProjectIdSch",  "VendorIdSch" };
            clearWebBeanValue(pageContext, webBean, webBeanStr);
}

    public static void clearRegion(OAPageContext pageContext, BaseMutableUINode baseNode) {
        UINodeList nodeList = baseNode.getIndexedNodeList();
        OARenderingContext rc = pageContext.getRenderingContext();

        for (int i = 0; i < nodeList.size(rc); i++) {
            UINode node = nodeList.getUINode(rc, i);
            if (node instanceof OAWebBeanDataAttribute) {
                OAWebBeanDataAttribute nodeToClear = (OAWebBeanDataAttribute)node;
                nodeToClear.setValue(pageContext, null);
            }

            clearRegion(pageContext, (BaseMutableUINode)node);
        }
    }

    /**
     * 将一个Region下的所有的子节点清空，通常用于清空查询条件。
     */
    public static void clearRegion(OAPageContext pageContext, OAWebBean webBean, String regionId) {
        String pageLayoutId = pageContext.getPageLayoutBean().getID();

        if (pageLayoutId.equals(regionId)) {
            BaseMutableUINode baseNode = (BaseMutableUINode)webBean;
            clearRegion(pageContext, baseNode);
        } else {
            BaseMutableUINode baseNode = (BaseMutableUINode)webBean.findChildRecursive(regionId);
            clearRegion(pageContext, baseNode);
        }
    }
    
    /**
     * 清空指定组件的值
     * @param pageContext
     * @param webBean
     * @param strWebBeanNames   需要被清空的组件ID
     */
    public static void clearWebBeanValue(OAPageContext pageContext, OAWebBean webBean, 
                                  String[] strWebBeanNames){
         {
           if (strWebBeanNames != null)
           {
            
             OAWebBean itemWebBean = null;
             //Search for Bean  
             if (strWebBeanNames != null)
             {
               for (int i = 0; i < strWebBeanNames.length; i++)
               {
                //用这个替换大量的类型匹配instance
                 itemWebBean = webBean.findChildRecursive(strWebBeanNames[i]);
                   if (itemWebBean instanceof OAWebBeanDataAttribute) {
                       OAWebBeanDataAttribute nodeToClear = (OAWebBeanDataAttribute)itemWebBean;
                       nodeToClear.setValue(pageContext, null);
                   }

               }
             }
           }
         }                             
     }