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 * and Distribution License("CDDL") (collectively, the "License").  You
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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