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package javax.faces.context;
import javax.faces.FacesException;
import javax.faces.FacesWrapper;
import javax.faces.lifecycle.Lifecycle;
/**
* FacesContextFactory
* is a factory object that creates
* (if needed) and returns new {@link FacesContext} instances, initialized
* for the processing of the specified request and response objects.
* Implementations may take advantage of the calls to the
* release() method of the allocated {@link FacesContext}
* instances to pool and recycle them, rather than creating a new instance
* every time.
*
* There must be one FacesContextFactory instance per web
* application that is utilizing JavaServer Faces. This instance can be
* acquired, in a portable manner, by calling:
*
* FacesContextFactory factory = (FacesContextFactory)
* FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
*
*
*/
public abstract class FacesContextFactory implements FacesWrapper {
public FacesContextFactory() {
}
/**
* If this factory has been decorated, the
* implementation doing the decorating may override this method to provide
* access to the implementation being wrapped. A default implementation
* is provided that returns null.
*
* @since 2.0
*/
public FacesContextFactory getWrapped() {
return null;
}
/**
* Create (if needed)
* and return a {@link FacesContext} instance that is initialized
* for the processing of the specified request and response objects,
* utilizing the specified {@link Lifecycle} instance, for this web
* application.
*
* The implementation of this method must ensure that calls to the
* getCurrentInstance() method of {@link FacesContext},
* from the same thread that called this method, will return the same
* {@link FacesContext} instance until the release()
* method is called on that instance.
* The implementation must call
* {@link ExternalContextFactory#getExternalContext} to produce the
* {@link ExternalContext} for the {@link FacesContext} instance.
* The default implementation must call
* {@link ExceptionHandlerFactory#getExceptionHandler} and make it
* so the return from that method is what gets returned from a call
* to {@link FacesContext#getExceptionHandler} on the returned
* FacesContext instance.
*
* The default implementation must call
* {@link javax.faces.lifecycle.ClientWindowFactory#getClientWindow} and make it
* so the return from that method is what gets returned from a call
* to {@link ExternalContext#getClientWindow()} on the returned
* ExternalContext instance.
*
* @param context In servlet environments, the
* ServletContext that is associated with this web
* application
* @param request In servlet environments, the
* ServletRequest that is to be processed
* @param response In servlet environments, the
* ServletResponse that is to be processed
* @param lifecycle The {@link Lifecycle} instance being used
* to process this request
*
* @throws FacesException if a {@link FacesContext} cannot be
* constructed for the specified parameters
* @throws NullPointerException if any of the parameters
* are null
*/
public abstract FacesContext getFacesContext
(Object context, Object request,
Object response, Lifecycle lifecycle)
throws FacesException;
}