You can add transient attribute to view object progmatically at run time.
You can use this transient attribute to store any temporary data for every row in view object or create generic solution in your custom framework for general purpose.

in ?ADF you can use below code anywhere in ApplicationModuleImpl class
I will check existence of attribute XXAttr, If it is not exist I will add it to view object

 ViewObject vo = this.findViewObject("ViewObjectName");  
     if (vo != null) {  
       try {  
         String transientAttr = vo.findAttributeDef("XXAttr").toString();  
       } catch (Exception e) {  
         vo.addDynamicAttribute("XXAttr");  
       }  
     } 

Same like sample in ADF I will check existence of attribute XXAttr, If it is not exist I will add it to view object
pre.CICodeFormatter{ font-family:arial; font-size:12px; border:1px dashed #CCCCCC; width:99%; height:auto; overflow:auto; background:#f0f0f0; line-height:20px; padding:0px; color:#000000; text-align:left; } pre.CICodeFormatter code{ color:#000000; word-wrap:normal; }

 public void processRequest(OAPageContext pageContext, OAWebBean webBean) {
        super.processRequest(pageContext, webBean);

        OAApplicationModule am = pageContext.getApplicationModule(webBean);
        OAViewObject vo = (OAViewObject)am.findViewObject("ViewObjectName");

        if (vo != null) {
            try {
                String transientAttr = 
                    vo.findAttributeDef("XXAttr").toString();
            } catch (Exception e) {
                vo.addDynamicAttribute("XXAttr");
            }
        }
    }