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package javax.ws.rs.core;

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

/**
 * Defines the components of a JAX-RS application and supplies additional
 * metadata. 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}.

* * @author Paul Sandoz * @author Marc Hadley * @since 1.0 */ public class Application { private static final Set EMPTY_OBJECT_SET = Collections.emptySet(); private static final Set> EMPTY_CLASS_SET = Collections.emptySet(); /** * Get a set of root resource and provider classes. The default lifecycle * for resource class instances is per-request. The default lifecycle for * providers is singleton. * *

Implementations should warn about and ignore classes that do not * conform to the requirements of root resource or provider 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 EMPTY_CLASS_SET; } /** * Get a set of root resource and provider 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 EMPTY_OBJECT_SET; } }