org.eclipse.persistence.jaxb.ReflectionUtils Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation
EclipseLink build based upon Git transaction f2b9fc5
There is a newer version: 5.0.0-B03
/*
 * Copyright (c) 2014, 2021 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,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Marcel Valovy - 2.6 - initial implementation
package org.eclipse.persistence.jaxb;

import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;

import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;

/**
 * Utility class for handling reflection calls and using caller sensitive actions.
 *
 *  - Singleton lazy-loaded actions honoring Initialization On Demand Holder idiom.
 *  - Lazy-loaded inner classes and inner interfaces. Only loaded if security is enabled.
 *
 * @author Marcel Valovy - [email protected]
 * @since 2.6
 */
final class ReflectionUtils {

    /**
     * Non-instantiable utility class. Reflection instantiation permitted.
     */
    private ReflectionUtils() {
    }

    /**
     * Retrieves class object.
     *
     * @param clazz name of class to be retrieved
     * @return class object
     * @see Class#forName(String)
     */
    static Class forName(String clazz) throws ClassNotFoundException {
        try {
            return PrivilegedAccessHelper.callDoPrivilegedWithException(
                    () -> Class.forName(clazz)
            );
        } catch (ClassNotFoundException ex) {
            throw ex;
        } catch (Exception ex) {
            throw new RuntimeException(String.format("Could not retrieve class %s.", clazz), ex);
        }
    }

    /**
     * Retrieves declared fields.
     *
     * @param clazz fields of that class will be returned
     * @return array of declared fields
     * @see Class#getDeclaredFields()
     */
    static Field[] getDeclaredFields(Class clazz) {
        return PrivilegedAccessHelper.callDoPrivileged(
                () -> clazz.getDeclaredFields()
        );
    }

    /**
     * Retrieves declared constructors.
     *
     * @param clazz class that will be scanned
     * @return declared constructors
     * @see Class#getDeclaredConstructors()
     */
    static Constructor[] getDeclaredConstructors(Class clazz) {
        return PrivilegedAccessHelper.callDoPrivileged(
                () -> clazz.getDeclaredConstructors()
        );
    }

    /**
     * Retrieves declared methods.
     *
     * @param clazz class that will be scanned
     * @return declared methods
     * @see Class#getDeclaredMethods()
     */
    static Method[] getDeclaredMethods(Class clazz) {
        return PrivilegedAccessHelper.callDoPrivileged(
                () -> clazz.getDeclaredMethods()
        );
    }

}