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A bundle project producing JAX-RS RI bundles. The primary artifact is an "all-in-one" OSGi-fied JAX-RS RI bundle (jaxrs-ri.jar). Attached to that are two compressed JAX-RS RI archives. The first archive (jaxrs-ri.zip) consists of binary RI bits and contains the API jar (under "api" directory), RI libraries (under "lib" directory) as well as all external RI dependencies (under "ext" directory). The secondary archive (jaxrs-ri-src.zip) contains buildable JAX-RS RI source bundle and contains the API jar (under "api" directory), RI sources (under "src" directory) as well as all external RI dependencies (under "ext" directory). The second archive also contains "build.xml" ANT script that builds the RI sources. To build the JAX-RS RI simply unzip the archive, cd to the created jaxrs-ri directory and invoke "ant" from the command line.

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/*
 * Copyright (c) 2012, 2019 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.jersey.server.internal.routing;

import org.glassfish.jersey.server.internal.process.Endpoint;
import org.glassfish.jersey.server.internal.process.RequestProcessingContext;

/**
 * Routing tree assembly utilities.
 *
 * @author Marek Potociar
 */
final class Routers {

    private static final Router IDENTITY_ROUTER = new Router() {

        @Override
        public Continuation apply(final RequestProcessingContext data) {
            return Continuation.of(data);
        }
    };

    private Routers() {
        throw new AssertionError("No instances of this class.");
    }

    /**
     * Create a terminal "no-op router" that accepts any input context and returns the unchanged request and an empty
     * continuation iterator.
     *
     * @return a terminal "no-op" router.
     */
    public static Router noop() {
        return IDENTITY_ROUTER;
    }

    /**
     * Creates a terminal {@link Router} that wraps the given {@link org.glassfish.jersey.server.internal.process.Endpoint
     * endpoint}.
     *
     * The {@link Router#apply} method of the created hierarchical router returns the unchanged request and an empty
     * continuation iterator.
     *
     * @param endpoint a server-side endpoint to be wrapped in a router instance.
     * @return a router that wraps the supplied endpoint.
     */
    public static Router endpoint(final Endpoint endpoint) {
        return new EndpointRouter(endpoint);
    }

    /**
     * Extract endpoint stored in a router (if any).
     *
     * @param router router from which a server endpoint should be extracted.
     * @return extracted endpoint or {@code null} if there was no endpoint stored in the router.
     */
    public static Endpoint extractEndpoint(final Router router) {
        if (router instanceof EndpointRouter) {
            return ((EndpointRouter) router).endpoint;
        }

        return null;
    }

    private static class EndpointRouter implements Router {

        private final Endpoint endpoint;

        public EndpointRouter(final Endpoint endpoint) {
            this.endpoint = endpoint;
        }

        @Override
        public Continuation apply(RequestProcessingContext context) {
            return Continuation.of(context);
        }
    }
}