1 /*

     2  * Copyright (c) 2003, 2009, Oracle and/or its affiliates. All rights reserved.

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

     4  *

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

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

     7  * published by the Free Software Foundation.  Oracle designates this

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

     9  * by Oracle in the LICENSE file that accompanied this code.

    10  *

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

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

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

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

    15  * accompanied this code).

    16  *

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

    18  * 2 along with this work; if not, write to the Free Software Foundation,

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

    20  *

    21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

    22  * or visit www.oracle.com if you need additional information or have any

    23  * questions.

    24  */

    25 package java.beans;

    26 

    27 import java.lang.reflect.Field;

    28 

    29 /**

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

    31  * using reflection.

    32  */

    33 class ReflectionUtils {

    34 

    35     @SuppressWarnings("rawtypes")

    36     public static boolean isPrimitive(Class type) {

    37         return primitiveTypeFor(type) != null;

    38     }

    39 

    40     @SuppressWarnings("rawtypes")

    41     public static Class primitiveTypeFor(Class wrapper) {

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

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

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

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

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

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

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

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

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

    51         return null;

    52     }

    53 

    54     /**

    55      * Returns the value of a private field.

    56      *

    57      * @param instance object instance

    58      * @param cls class

    59      * @param name name of the field

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

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

    62      */

    63     @SuppressWarnings("rawtypes")

    64     public static Object getPrivateField(Object instance, Class cls,

    65                                          String name, ExceptionListener el) {

    66         try {

    67             Field f = cls.getDeclaredField(name);

    68             f.setAccessible(true);

    69             return f.get(instance);

    70         }

    71         catch (Exception e) {

    72             if (el != null) {

    73                 el.exceptionThrown(e);

    74             }

    75         }

    76         return null;

    77     }

    78 }