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• ModelHelper.java

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org.glassfish.jersey.server.model.internal.ModelHelper Maven / Gradle / Ivy

/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2014 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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 * elects to include this software in this distribution under the [CDDL or GPL
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 */

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

import javax.ws.rs.Path;

/**
 * Common model helper methods.
 *
 * @author Michal Gajdos (michal.gajdos at oracle.com)
 * @author Constantino Cronemberger (ccronemberger at yahoo.com.br)
 */
public final class ModelHelper {

    /**
     * Get the class in the provided resource class ancestor hierarchy that
     * is actually annotated with the {@link javax.ws.rs.Path @Path} annotation.
     *
     * @param resourceClass resource class.
     * @return resource class or it's ancestor that is annotated with the {@link javax.ws.rs.Path @Path}
     *         annotation.
     */
    public static Class getAnnotatedResourceClass(Class resourceClass) {

        // traverse the class hierarchy to find the annotation
        Class cls = resourceClass;
        do {
            if (cls.isAnnotationPresent(Path.class)) {
                return cls;
            }

            for (Class i : cls.getInterfaces()) {
                if (i.isAnnotationPresent(Path.class)) {
                    return i;
                }
            }
        } while ((cls = cls.getSuperclass()) != null);

        return resourceClass;
    }

    /**
     * Prevent instantiation.
     */
    private ModelHelper() {
    }
}