/*

 * Copyright 2003-2009 Sun Microsystems, Inc.  All Rights Reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Sun designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Sun in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

 * CA 95054 USA or visit www.sun.com if you need additional information or

 * have any questions.

 */

package java.beans;

import java.lang.reflect.Field;

/**

 * A utility class for reflectively finding methods, constuctors and fields

 * using reflection.

 */

class ReflectionUtils {

    public static boolean isPrimitive(Class type) {

        return primitiveTypeFor(type) != null;

    }

    public static Class primitiveTypeFor(Class wrapper) {

        if (wrapper == Boolean.class) return Boolean.TYPE;

        if (wrapper == Byte.class) return Byte.TYPE;

        if (wrapper == Character.class) return Character.TYPE;

        if (wrapper == Short.class) return Short.TYPE;

        if (wrapper == Integer.class) return Integer.TYPE;

        if (wrapper == Long.class) return Long.TYPE;

        if (wrapper == Float.class) return Float.TYPE;

        if (wrapper == Double.class) return Double.TYPE;

        if (wrapper == Void.class) return Void.TYPE;

        return null;

    }

    /**

     * Returns the value of a private field.

     *

     * @param instance object instance

     * @param cls class

     * @param name name of the field

     * @param el an exception listener to handle exceptions; or null

     * @return value of the field; null if not found or an error is encountered

     */

    public static Object getPrivateField(Object instance, Class cls,

                                         String name, ExceptionListener el) {

        try {

            Field f = cls.getDeclaredField(name);

            f.setAccessible(true);

            return f.get(instance);

        }

        catch (Exception e) {

            if (el != null) {

                el.exceptionThrown(e);

            }

        }

        return null;

    }

}