OAF How to handle Button, Hyperlink, Lov Events

//Handle button event
     if(pageContext.getParameter("clickBtn")!=null)
       {
         OAException infoMsg = new OAException("User Clicked On Button",
           OAException.WARNING);
         throw infoMsg; 
       
       }

//Handle Link Event  --FireAction Event param
    String eventNameStr = pageContext.getParameter(EVENT_PARAM);
    if(eventNameStr!=null && "linkEvent".equals(eventNameStr))
     {
       throw new OAException("User Clicked on Link ", OAException.INFORMATION);
     
     }

//LOV Event

     if(pageContext.isLovEvent())
       {
         String lovSourceIDStr= pageContext.getLovInputSourceId();
          
          if(lovSourceIDStr!=null && "orgNameLovID".equals(lovSourceIDStr))
            {
            
             OAMessageLovInputBean orgNameLovIDBean = (OAMessageLovInputBean)webBean.findIndexedChildRecursive("orgNameLovID");
             
             String orgNameStr = (String)orgNameLovIDBean.getValue(pageContext);
             
             OAFormValueBean orgIDFVBean = (OAFormValueBean)webBean.findIndexedChildRecursive("orgIDFV");
             
             String orgID = (String)orgIDFVBean.getValue(pageContext);   
            
            }
       
       }