001    /*
002     * Copyright (C) 2008-2010 by Holger Arndt
003     *
004     * This file is part of the Universal Java Matrix Package (UJMP).
005     * See the NOTICE file distributed with this work for additional
006     * information regarding copyright ownership and licensing.
007     *
008     * UJMP is free software; you can redistribute it and/or modify
009     * it under the terms of the GNU Lesser General Public License as
010     * published by the Free Software Foundation; either version 2
011     * of the License, or (at your option) any later version.
012     *
013     * UJMP is distributed in the hope that it will be useful,
014     * but WITHOUT ANY WARRANTY; without even the implied warranty of
015     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
016     * GNU Lesser General Public License for more details.
017     *
018     * You should have received a copy of the GNU Lesser General Public
019     * License along with UJMP; if not, write to the
020     * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
021     * Boston, MA  02110-1301  USA
022     */
023    
024    package org.ujmp.core.util;
025    
026    import java.lang.reflect.Field;
027    
028    public class ReflectionUtil {
029    
030            public static Object extractPrivateField(Object o, String fieldName) {
031                    return extractPrivateField(o.getClass(), o, fieldName);
032            }
033    
034            public static Object extractPrivateField(Class<?> c, Object o, String fieldName) {
035                    Field[] fields = c.getDeclaredFields();
036                    if (fields != null) {
037                            for (Field f : fields) {
038                                    try {
039                                            if (fieldName.equals(f.getName())) {
040                                                    boolean isAccessible = f.isAccessible();
041                                                    f.setAccessible(true);
042                                                    Object value = f.get(o);
043                                                    f.setAccessible(isAccessible);
044                                                    return value;
045                                            }
046                                    } catch (Exception e) {
047                                            e.printStackTrace();
048                                    }
049                            }
050                    }
051                    return null;
052            }
053    
054    }