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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; }




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