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package javax.faces.context;
import javax.faces.FacesWrapper;
/**
* FlashFactory is a
* factory object that creates (if needed) and returns {@link Flash}
* instances. Implementations of JavaServer Faces must provide at
* least a default implementation of {@link Flash}.
*
*
* There must be one {@link FlashFactory} instance per web
* application that is utilizing JavaServer Faces. This instance can
* be acquired, in a portable manner, by calling:
*
* FlashFactory factory = (FlashFactory)
* FactoryFinder.getFactory(FactoryFinder.FLASH_FACTORY);
*
* The common way to access the flash instance from Java code is
* still via {@link ExternalContext#getFlash}. The common way to access
* the flash from Faces views is the implicit EL object "flash". The
* runtime must ensure that the FlashFactory is used to
* instantiate the flash.
*
*
* @since 2.2
*/
public abstract class FlashFactory 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 2.2
*/
public FlashFactory getWrapped() {
return null;
}
/**
* Create (if needed) and return a
* {@link Flash} instance for this web application.
*
* @param context the ExternalContext for this request.
*
* @param create true to create a new instance for this request if
* necessary; false to return null if there's no
* instance in the current session.
*
* @since 2.2
*/
public abstract Flash getFlash(ExternalContext context, boolean create);
}