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package javax.faces.view;
import java.lang.annotation.Documented;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.annotation.ElementType;
import java.lang.annotation.Inherited;
import javax.enterprise.context.NormalScope;
/**
* <p class="changed_added_2_2">When this annotation, along with {@code
* javax.inject.Named} is found on a class, the runtime must place the
* bean in a CDI scope such that it remains active as long as {@link
* javax.faces.application.NavigationHandler#handleNavigation} does not
* cause a navigation to a view with a viewId that is different than the
* viewId of the current view. Any injections and notifications required
* by CDI and the Java EE platform must occur as usual at the expected
* time.</p>
*
* <div class="changed_added_2_2">
* <p>If <code>ProjectStage</code> is not
* <code>ProjectStage.Production</code>, verify that the current {@link
* javax.faces.component.UIViewRoot} does not have its {@code transient}
* property set to {@code true}. If so, add a <code>FacesMessage</code>
* for the current {@code viewId} to the <code>FacesContext</code>
* stating {@code @ViewScoped} beans cannot work if the view is marked
* as transient. Also log a <code>Level.WARNING</code> message to the
* log. If <code>ProjectStage</code> <strong>is</strong>
* <code>ProjectStage.Production</code>, do not do this
* verification.</p>
* <p>The bean must be stored in the map returned from
* {@link javax.faces.component.UIViewRoot#getViewMap(boolean)}.</p>
* <p>Use of this annotation requires that any beans stored in view scope
* must be serializable and proxyable as defined in the CDI specification.
* </p>
* <p>The runtime must ensure that any methods on the bean annotated
* with {@code PostConstruct} or {@code PreDestroy} are called when the
* scope begins and ends, respectively. Two circumstances can cause the
* scope to end.</p>
* <ul>
* <li><p>{@link javax.faces.context.FacesContext#setViewRoot} is called
* with the new {@code UIViewRoot} being different than the current
* one.</p></li>
* <li><p>The session, that happened to be active when the bean was
* created, expires. If no session existed when the bean was created,
* then this circumstance does not apply.</p></li>
* </ul>
* <p>In the session expiration case, the runtime must ensure that
* {@link javax.faces.context.FacesContext#getCurrentInstance} returns a
* valid instance if it is called during the processing of the
* {@code @PreDestroy} annotated method. The set of methods on {@code
* FacesContext} that are valid to call in this circumstance is
* identical to those documented as "valid to call this method during
* application startup or shutdown". On the {@link
* javax.faces.context.ExternalContext} returned from that {@code
* FacesContext}, all of the methods documented as "valid to call this
* method during application startup or shutdown" are valid to call. In
* addition, the method {@link
* javax.faces.context.ExternalContext#getSessionMap} is also valid to
* call.</p>
*
*
* </div>
* @since 2.2
*/
@NormalScope(passivating = true)
@Inherited
@Documented
@Target({ElementType.TYPE, ElementType.FIELD, ElementType.METHOD})
@Retention(value = RetentionPolicy.RUNTIME)
public @interface ViewScoped {
}