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package javax.faces.lifecycle;
import java.util.Iterator;
import javax.faces.FacesWrapper;
/**
* LifecycleFactory is
* a factory object that creates (if needed) and returns {@link
* Lifecycle} instances. Implementations of JavaServer Faces must
* provide at least a default implementation of {@link Lifecycle}.
* Advanced implementations (or external third party libraries) MAY
* provide additional {@link Lifecycle} implementations (keyed by
* lifecycle identifiers) for performing different types of request
* processing on a per-request basis.
*
* There must be one LifecycleFactory instance per web
* application that is utilizing JavaServer Faces. This instance can be
* acquired, in a portable manner, by calling:
*
* LifecycleFactory factory = (LifecycleFactory)
* FactoryFinder.getFactory(FactoryFinder.LIFECYCLE_FACTORY);
*
*/
public abstract class LifecycleFactory 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 LifecycleFactory getWrapped() {
return null;
}
/**
* The lifecycle identifier for the default {@link Lifecycle} instance
* for this JavaServer Faces implementation.
*/
public static final String DEFAULT_LIFECYCLE = "DEFAULT";
/**
* Register a new {@link Lifecycle} instance, associated with
* the specified lifecycleId, to be supported by this
* LifecycleFactory. This method may be called at
* any time, and makes the corresponding {@link Lifecycle} instance
* available throughout the remaining lifetime of this web application.
*
*
* @param lifecycleId Identifier of the new {@link Lifecycle}
* @param lifecycle {@link Lifecycle} instance that we are registering
*
* @throws IllegalArgumentException if a {@link Lifecycle} with the
* specified lifecycleId has already been registered
* @throws NullPointerException if lifecycleId
* or lifecycle is null
*/
public abstract void addLifecycle(String lifecycleId,
Lifecycle lifecycle);
/**
* Create (if needed) and return a {@link Lifecycle} instance
* for the specified lifecycle identifier. The set of available
* lifecycle identifiers is available via the
* getLifecycleIds() method.
*
* Each call to getLifecycle() for the same
* lifecycleId, from within the same web application,
* must return the same {@link Lifecycle} instance.
*
* @param lifecycleId Lifecycle identifier of the requested
* {@link Lifecycle} instance
*
* @throws IllegalArgumentException if no {@link Lifecycle} instance
* can be returned for the specified identifier
* @throws NullPointerException if lifecycleId
* is null
*/
public abstract Lifecycle getLifecycle(String lifecycleId);
/**
* Return an Iterator over the set of lifecycle
* identifiers supported by this factory. This set must include
* the value specified by LifecycleFactory.DEFAULT_LIFECYCLE.
*
*/
public abstract Iterator getLifecycleIds();
}