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package javax.faces.context;
import javax.faces.FacesException;
import javax.faces.FacesWrapper;
/**
* ExternalContextFactory
* is a factory object that creates
* (if needed) and returns new {@link ExternalContext} instances, initialized
* for the processing of the specified request and response objects.
*
* There must be one ExternalContextFactory instance per web
* application that is utilizing JavaServer Faces. This instance can be
* acquired, in a portable manner, by calling:
*
* ExternalContextFactory factory = (ExternalContextFactory)
* FactoryFinder.getFactory(FactoryFinder.EXTERNAL_CONTEXT_FACTORY);
*
*
*/
public abstract class ExternalContextFactory implements FacesWrapper {
/**
* 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 ExternalContextFactory getWrapped() {
return null;
}
/**
* Create (if needed)
* and return an {@link ExternalContext} instance that is initialized
* for the processing of the specified request and response objects,
* for this web application.
*
* @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
*
* @throws FacesException if a {@link ExternalContext} cannot be
* constructed for the specified parameters
* @throws NullPointerException if any of the parameters
* are null
*/
public abstract ExternalContext getExternalContext
(Object context, Object request,
Object response) throws FacesException;
}