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Jersey core server implementation
/*
* Copyright (c) 2013, 2018 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.model.internal;
import javax.ws.rs.Path;
/**
* Common model helper methods.
*
* @author Michal Gajdos
* @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(final Class resourceClass) {
Class foundInterface = null;
// traverse the class hierarchy to find the annotation
// According to specification, annotation in the super-classes must take precedence over annotation in the
// implemented interfaces
Class cls = resourceClass;
do {
if (cls.isAnnotationPresent(Path.class)) {
return cls;
}
// if no annotation found on the class currently traversed, check for annotation in the interfaces on this
// level - if not already previously found
if (foundInterface == null) {
for (final Class i : cls.getInterfaces()) {
if (i.isAnnotationPresent(Path.class)) {
// store the interface reference in case no annotation will be found in the super-classes
foundInterface = i;
break;
}
}
}
} while ((cls = cls.getSuperclass()) != null);
if (foundInterface != null) {
return foundInterface;
}
return resourceClass;
}
/**
* Prevent instantiation.
*/
private ModelHelper() {
throw new AssertionError("Instantiation not allowed.");
}
}