JSFUtil Utilitario para manipular paginas em jsf

Bom pessoal .. deps de um LONGO tempo sem mexer em jsf .. estou voltando à ativa no jsf... mtas novidades mas .. não posso deixar de usar as coisas q eu ja implementei .. então la vai um utilitário para manipular jsf .. Abraços

 import java.util.Map;  
 import javax.faces.FactoryFinder;  
 import javax.faces.application.Application;  
 import javax.faces.application.ApplicationFactory;  
 import javax.faces.application.FacesMessage;  
 import javax.faces.context.ExternalContext;  
 import javax.faces.context.FacesContext;  
 import javax.faces.el.ValueBinding;  
 import javax.faces.webapp.UIComponentTag;  
 import javax.servlet.ServletContext;  
 import javax.servlet.http.HttpServletRequest;  
 import javax.servlet.http.HttpServletResponse;  
 import javax.servlet.http.HttpSession;  
 /**  
  *  
  * @author Caio Paulucci  
  */  
 public class JSFHelper {  
   public static ExternalContext getExternalContext() {  
     FacesContext facesContext = FacesContext.getCurrentInstance();  
     return facesContext.getExternalContext();  
   }  
   public static String getRequestParameter(String parameterName) {  
     Map paramMap = getExternalContext().getRequestParameterMap();  
     return (String) paramMap.get(parameterName);  
   }  
   public static Object getRequestAttribute(String attributeName) {  
     Map attrMap = getExternalContext().getRequestMap();  
     return attrMap.get(attributeName);  
   }  
   public static Object getSessionAttribute(String attributeName) {  
     Map attrMap = getExternalContext().getSessionMap();  
     return attrMap.get(attributeName);  
   }  
   public static void setSessionAttribute(String attributeName, Object attribute) {  
     Map attrMap = getExternalContext().getSessionMap();  
     attrMap.put(attributeName, attribute);  
   }  
   public static Object getApplicationAttribute(String attributeName) {  
     Map attrMap = getExternalContext().getApplicationMap();  
     return attrMap.get(attributeName);  
   }  
   public static void addGlobalMessage(String message) {  
     FacesMessage facesMessage = new FacesMessage(message);  
     FacesContext.getCurrentInstance().addMessage(null, facesMessage);  
   }  
   public static FacesContext getFacesContext(){  
     return FacesContext.getCurrentInstance();  
   }  
   /**  
    * Get servlet context.  
    *  
    * @return the servlet context  
    */  
   public static ServletContext getServletContext() {  
     return (ServletContext) FacesContext.getCurrentInstance()  
                       .getExternalContext().getContext();  
   }  
   /**  
    * Get managed bean based on the bean name.  
    *  
    * @param beanName the bean name  
    * @return the managed bean associated with the bean name  
    */  
   public static Object getManagedBean(String beanName) {  
     Object o =  
       getValueBinding(getJsfEl(beanName)).getValue(FacesContext.getCurrentInstance());  
     return o;  
   }  
   /**  
    * Remove the managed bean based on the bean name.  
    *  
    * @param beanName the bean name of the managed bean to be removed  
    */  
   public static void resetManagedBean(String beanName) {  
     getValueBinding(getJsfEl(beanName)).setValue(FacesContext.getCurrentInstance(),  
                            null);  
   }  
   /**  
    * Store the managed bean inside the session scope.  
    *  
    * @param beanName the name of the managed bean to be stored  
    * @param managedBean the managed bean to be stored  
    */  
   @SuppressWarnings("unchecked")  
  public static void setManagedBeanInSession(String beanName,  
                         Object managedBean) {  
     FacesContext.getCurrentInstance().getExternalContext().getSessionMap()  
           .put(beanName, managedBean);  
   }  
   /**  
    * Get parameter value from request scope.  
    *  
    * @param name the name of the parameter  
    * @return the parameter value  
    */  
   public static Map getRequestParameters() {  
     return FacesContext.getCurrentInstance().getExternalContext()  
                   .getRequestParameterMap();  
   }  
   /**  
    * Add information message.  
    *  
    * @param msg the information message  
    */  
   public static void addInfoMessage(String msg) {  
     addInfoMessage(null, msg);  
   }  
   /**  
    * Add information message to a sepcific client.  
    *  
    * @param clientId the client id  
    * @param msg the information message  
    */  
   public static void addInfoMessage(String clientId, String msg) {  
     FacesContext.getCurrentInstance().addMessage(clientId,  
                            new FacesMessage(FacesMessage.SEVERITY_INFO,  
                                    msg, msg));  
   }  
   /**  
    * Add error message.  
    *  
    * @param msg the error message  
    */  
   public static void addErrorMessage(String msg) {  
     addErrorMessage(null, msg);  
   }  
   /**  
    * Add error message to a sepcific client.  
    *  
    * @param clientId the client id  
    * @param msg the error message  
    */  
   public static void addErrorMessage(String clientId, String msg) {  
     FacesContext.getCurrentInstance().addMessage(clientId,  
                            new FacesMessage(FacesMessage.SEVERITY_ERROR,  
                                    msg, msg));  
   }  
   /**  
    * Evaluate the integer value of a JSF expression.  
    *  
    * @param el the JSF expression  
    * @return the integer value associated with the JSF expression  
    */  
   public static Integer evalInt(String el) {  
     if (el == null) {  
       return null;  
     }  
     if (UIComponentTag.isValueReference(el)) {  
       Object value = getElValue(el);  
       if (value == null) {  
         return null;  
       } else if (value instanceof Integer) {  
         return (Integer) value;  
       } else {  
         return new Integer(value.toString());  
       }  
     } else {  
       return new Integer(el);  
     }  
   }  
   private static Application getApplication() {  
     ApplicationFactory appFactory =  
       (ApplicationFactory) FactoryFinder.getFactory(FactoryFinder.APPLICATION_FACTORY);  
     return appFactory.getApplication();  
   }  
   private static ValueBinding getValueBinding(String el) {  
     return getApplication().createValueBinding(el);  
   }  
   public static HttpServletRequest getRequest() {  
     return (HttpServletRequest) FacesContext.getCurrentInstance()  
                         .getExternalContext()  
                         .getRequest();  
   }  
   public static HttpServletResponse getResponse() {  
     return (HttpServletResponse) FacesContext.getCurrentInstance()  
                         .getExternalContext()  
                         .getResponse();  
   }  
   public static HttpSession getSession() {  
     return (HttpSession) FacesContext.getCurrentInstance()  
                         .getExternalContext()  
                         .getSession(false);  
   }  
   private static Object getElValue(String el) {  
     return getValueBinding(el).getValue(FacesContext.getCurrentInstance());  
   }  
   private static String getJsfEl(String value) {  
     return "#{" + value + "}";  
   }  
 }