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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.
*
*
* Usage: extend this class and push the implementation being wrapped to the
* constructor and use {@link #getWrapped} to access the instance being wrapped.
*
* @since 2.2
*/
public abstract class FlashFactory implements FacesWrapper {
private FlashFactory wrapped;
/**
* @deprecated Use the other constructor taking the implementation being wrapped.
*/
@Deprecated
public FlashFactory() {
}
/**
* If this factory has been decorated,
* the implementation doing the decorating should push the implementation being wrapped to this constructor.
* The {@link #getWrapped()} will then return the implementation being wrapped.
*
* @param wrapped The implementation being wrapped.
*/
public FlashFactory(FlashFactory wrapped) {
this.wrapped = wrapped;
}
/**
* If this factory has been decorated, the
* implementation doing the decorating may override this method to provide
* access to the implementation being wrapped.
*/
@Override
public FlashFactory getWrapped() {
return wrapped;
}
/**
* Create (if needed) and return a
* {@link Flash} instance for this web application.
*
* @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
.
*
* @return the instance of Flash
.
*
* @since 2.2
*/
public abstract Flash getFlash(boolean create);
}