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This module contains the Metro runtime code.
There is a newer version: 4.0.4
/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2013-2017 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
 * https://oss.oracle.com/licenses/CDDL+GPL-1.1
 * or 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 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:
 * "Portions Copyright [year] [name of copyright owner]"
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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
 * Version 2] license."  If you don't indicate a single choice of license, a
 * 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
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 */

package com.sun.xml.bind.v2.runtime;

import com.sun.xml.bind.v2.model.nav.Navigator;

import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.logging.Level;
import java.util.logging.Logger;

/**
 * Utils class.
 *
 * WARNING: If you are doing any changes don't forget to change other Utils classes in different packages.
 *
 * Has *package private* access to avoid inappropriate usage.
 */
final class Utils {

    private static final Logger LOGGER = Logger.getLogger(Utils.class.getName());

    /**
     * static ReflectionNavigator field to avoid usage of reflection every time we use it.
     */
    static final Navigator REFLECTION_NAVIGATOR;

    static { // we statically initializing REFLECTION_NAVIGATOR property
        try {
            final Class refNav = Class.forName("com.sun.xml.bind.v2.model.nav.ReflectionNavigator");

            // requires accessClassInPackage privilege
            final Method getInstance = AccessController.doPrivileged(
                    new PrivilegedAction() {
                        @Override
                        public Method run() {
                            try {
                                Method getInstance = refNav.getDeclaredMethod("getInstance");
                                getInstance.setAccessible(true);
                                return getInstance;
                            } catch (NoSuchMethodException e) {
                                throw new IllegalStateException("ReflectionNavigator.getInstance can't be found");
                            }
                        }
                    }
            );

            //noinspection unchecked
            REFLECTION_NAVIGATOR = (Navigator) getInstance.invoke(null);
        } catch (ClassNotFoundException e) {
            throw new IllegalStateException("Can't find ReflectionNavigator class");
        } catch (InvocationTargetException e) {
            throw new IllegalStateException("ReflectionNavigator.getInstance throws the exception");
        } catch (IllegalAccessException e) {
            throw new IllegalStateException("ReflectionNavigator.getInstance method is inaccessible");
        } catch (SecurityException e) {
            LOGGER.log(Level.FINE, "Unable to access ReflectionNavigator.getInstance", e);
            throw e;
        }
    }

    /**
     * private constructor to avoid util class instantiating
     */
    private Utils() {
    }
}