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package javax.ws.rs.core;

import java.util.Collections;
import java.util.Map;
import java.util.Set;

/**
 * Defines the components of a JAX-RS application and supplies additional
 * meta-data. A JAX-RS application or implementation supplies a concrete
 * subclass of this abstract class.
 * 

* The implementation-created instance of an Application subclass may be * injected into resource classes and providers using * {@link javax.ws.rs.core.Context}. *

*

* In case any of the {@code Application} subclass methods or it's constructor * throws a {@link RuntimeException}, the deployment of the application SHOULD * be aborted with a failure. *

* * @author Paul Sandoz * @author Marc Hadley * @author Marek Potociar * @since 1.0 */ public class Application { /** * Get a set of root resource, provider and {@link Feature feature} classes. * * The default life-cycle for resource class instances is per-request. The default * life-cycle for providers (registered directly or via a feature) is singleton. *

* Implementations should warn about and ignore classes that do not * conform to the requirements of root resource or provider/feature classes. * Implementations should warn about and ignore classes for which * {@link #getSingletons()} returns an instance. Implementations MUST * NOT modify the returned set. *

*

* The default implementation returns an empty set. *

* * @return a set of root resource and provider classes. Returning {@code null} * is equivalent to returning an empty set. */ public Set> getClasses() { return Collections.emptySet(); } /** * Get a set of root resource, provider and {@link Feature feature} instances. * * Fields and properties of returned instances are injected with their declared * dependencies (see {@link Context}) by the runtime prior to use. *

* Implementations should warn about and ignore classes that do not * conform to the requirements of root resource or provider classes. * Implementations should flag an error if the returned set includes * more than one instance of the same class. Implementations MUST * NOT modify the returned set. *

*

* The default implementation returns an empty set. *

* * @return a set of root resource and provider instances. Returning {@code null} * is equivalent to returning an empty set. */ public Set getSingletons() { return Collections.emptySet(); } /** * Get a map of custom application-wide properties. *

* The returned properties are reflected in the application {@link Configuration configuration} * passed to the server-side features or injected into server-side JAX-RS components. *

*

* The set of returned properties may be further extended or customized at deployment time * using container-specific features and deployment descriptors. For example, in a Servlet-based * deployment scenario, web application's {@code } and Servlet {@code } * values may be used to extend or override values of the properties programmatically returned * by this method. *

*

* The default implementation returns an empty set. *

* * @return a map of custom application-wide properties. Returning {@code null} * is equivalent to returning an empty set. * @since 2.0 */ public Map getProperties() { return Collections.emptyMap(); } }