abstract public  void addMessage(String clientId,
    FacesMessage message)
Append a javax.faces.application.FacesMessage  to the set of messages associated with
the specified client identifier, if clientId is
not null. If clientId is null,
this javax.faces.application.FacesMessage  is assumed to not be associated with any
specific component instance.

 abstract public Application getApplication()
Return the Application  instance associated with this
web application.

 abstract public Iterator getClientIdsWithMessages()
Return an Iterator over the client identifiers for
which at least one javax.faces.application.FacesMessage  has been queued. If there are no
such client identifiers, an empty Iterator is returned.
If any messages have been queued that were not associated with any
specific client identifier, a null value will be included
in the iterated values. The elements in the Iterator must
be returned in the order in which they were added with #addMessage .

 public static FacesContext getCurrentInstance() 
{
                           
        return (instance.get());
}

Return the FacesContext instance for the request that is being processed by the current thread, if any.

 public ELContext getELContext() 
{
        Map m = (Map) getExternalContext().getRequestMap().get("com.sun.faces.util.RequestStateManager");
        if (m != null) {
            FacesContext impl = (FacesContext) m.get("com.sun.faces.FacesContextImpl");
            if (impl != null) {
                return impl.getELContext();
            } else {
                throw new UnsupportedOperationException();
            }
        }
        throw new UnsupportedOperationException();
}

Return the ELContext instance for this FacesContext instance. This ELContext instance has the same lifetime and scope as the FacesContext instance with which it is associated, and may be created lazily the first time this method is called for a given FacesContext instance. Upon creation of the ELContext instance, the implementation must take the following action:

• Call the ELContext#putContext method on the instance, passing in FacesContext.class and the this reference for the FacesContext instance itself.

• If the Collection returned by javax.faces.application.Application#getELContextListeners is non-empty, create an instance of javax.el.ELContextEvent and pass it to each javax.el.ELContextListener instance in the Collection by calling the javax.el.ELContextListener#contextCreated method.

The default implementation throws UnsupportedOperationException and is provided for the sole purpose of not breaking existing applications that extend this class.

 abstract public ExternalContext getExternalContext()
Return the ExternalContext  instance for this
FacesContext instance.

 abstract public Severity getMaximumSeverity()
Return the maximum severity level recorded on any
javax.faces.application.FacesMessage s that has been queued, whether or not they are
associated with any specific UIComponent . If no such messages
have been queued, return null.

 abstract public Iterator getMessages()
Return an Iterator over the javax.faces.application.FacesMessage s
that have been queued, whether or not they are associated with any
specific client identifier. If no such messages have been queued,
return an empty Iterator. The elements of the Iterator
must be returned in the order in which they were added with calls to #addMessage .

 abstract public Iterator getMessages(String clientId)
Return an Iterator over the javax.faces.application.FacesMessage s that
have been queued that are associated with the specified client identifier
(if clientId is not null), or over the
javax.faces.application.FacesMessage s that have been queued that are not associated with
any specific client identifier (if clientId is
null). If no such messages have been queued, return an
empty Iterator. The elements of the Iterator
must be returned in the order in which they were added with calls to #addMessage .

 abstract public RenderKit getRenderKit()
Return the RenderKit  instance for the render kit identifier
specified on our UIViewRoot , if there is one. If there is no
current UIViewRoot , if the UIViewRoot  does not have a
specified renderKitId, or if there is no RenderKit 
for the specified identifier, return null instead.

 abstract public boolean getRenderResponse()
Return true if the renderResponse()
method has been called for the current request.

 abstract public boolean getResponseComplete()
Return true if the responseComplete()
method has been called for the current request.

 abstract public ResponseStream getResponseStream()
Return the ResponseStream  to which components should
direct their binary output. Within a given response, components
can use either the ResponseStream or the ResponseWriter,
but not both.

 abstract public ResponseWriter getResponseWriter()
Return the ResponseWriter  to which components should
direct their character-based output. Within a given response,
components can use either the ResponseStream or the ResponseWriter,
but not both.

 abstract public UIViewRoot getViewRoot()
Return the root component that is associated with the this request.

 abstract public  void release()
Release any resources associated with this
FacesContext instance. Faces implementations may
choose to pool instances in the associated FacesContextFactory  to avoid repeated object creation and
garbage collection. After release() is called on a
FacesContext instance (until the
FacesContext instance has been recycled by the
implementation for re-use), calling any other methods will cause
an IllegalStateException to be thrown.

The implementation must call #setCurrentInstance 
passing null to remove the association between this
thread and this dead FacesContext instance.

 abstract public  void renderResponse()
Signal the JavaServer faces implementation that, as soon as the
current phase of the request processing lifecycle has been completed,
control should be passed to the Render Response phase,
bypassing any phases that have not been executed yet.

 abstract public  void responseComplete()
Signal the JavaServer Faces implementation that the HTTP response
for this request has already been generated (such as an HTTP redirect),
and that the request processing lifecycle should be terminated as soon
as the current phase is completed.

 protected static  void setCurrentInstance(FacesContext context) 
{
        if (context == null) {
            instance.remove();
        } else {
            instance.set(context);
        }
}

Set the FacesContext instance for the request that is being processed by the current thread.

 abstract public  void setResponseStream(ResponseStream responseStream)
Set the ResponseStream  to which components should
direct their binary output.

 abstract public  void setResponseWriter(ResponseWriter responseWriter)
Set the ResponseWriter  to which components should
direct their character-based output.

 abstract public  void setViewRoot(UIViewRoot root)
Set the root component that is associated with this request.
This method can only be called by the application handler (or a
class that the handler calls), and only during the Invoke
Application phase of the request processing lifecycle.