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org.glassfish.jersey.server.internal.routing.Route Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2012-2014 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
 *
 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
 * exception as provided by Oracle in the GPL Version 2 section of the License
 * file that accompanied this code.
 *
 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 * If you wish your version of this file to be governed by only the CDDL or
 * only the GPL Version 2, indicate your decision by adding "[Contributor]
 * elects to include this software in this distribution under the [CDDL or GPL
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 * recipient has the option to distribute your version of this file under
 * either the CDDL, the GPL Version 2 or to extend the choice of license to
 * its licensees as provided above.  However, if you add GPL Version 2 code
 * and therefore, elected the GPL Version 2 license, then the option applies
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 */
package org.glassfish.jersey.server.internal.routing;

import java.util.Collections;
import java.util.List;

import org.glassfish.hk2.api.Factory;

import jersey.repackaged.com.google.common.base.Function;
import jersey.repackaged.com.google.common.collect.Lists;

/**
 * Request routing information. Contains a {@link #routingPattern() routing pattern}
 * and a {@link #next() list of next-level stages} to be processed in case the
 * routing pattern successfully matches the un-matched right-hand part of the request.
 *
 * @param  routing pattern type.
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
final class Route {
    /**
     * Transformation function that converts router provider into router.
     */
    private static final Function, Router> PROVIDER_TO_ROUTER_TRANSFORMATION =
            new Function, Router>() {

                @Override
                public Router apply(Factory f) {
                    return f.provide();
                }
            };

    private final T routingPattern;
    private final List> routerProviders;

    /**
     * Create a new request route.
     *
     * @param              routing pattern type.
     * @param routingPattern  request path routing pattern.
     * @param routerProviders next-level routers to be processed in case the routing
     *                        pattern matches the unmatched right-hand part of the request path.
     * @return new request route.
     */
    static  Route of(T routingPattern, List> routerProviders) {
        return new Route(routingPattern, routerProviders);
    }

    private Route(T routingPattern, List> routerProviders) {
        this.routingPattern = routingPattern;
        this.routerProviders = routerProviders;
    }

    /**
     * Get the request path routing pattern.
     *
     * @return request path routing pattern.
     */
    public T routingPattern() {
        return routingPattern;
    }

    /**
     * Get next-level routers to be processed in case the routing pattern matches
     * the unmatched right-hand part of the request path.
     *
     * @return routed next-level next.
     */
    public List next() {
        if (routerProviders.isEmpty()) {
            return Collections.emptyList();
        } else {
            return Lists.transform(routerProviders, Route.PROVIDER_TO_ROUTER_TRANSFORMATION);
        }
    }
}