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JSR-000344: JavaServer(TM) Faces 2.2 API
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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 {

    public LifecycleFactory() {
    }
    
    
    /**
     * 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();


}