Java Reflection Field Find findField(Class clazz, String fieldName)

Description

Find field.

License

Open Source License

Parameter

Parameter	Description
clazz	the class
fieldName	the field name

Return

field instance

Declaration

private static Field findField(Class<?> clazz, String fieldName) 

Method Source Code

//package com.java2s;
/*//from w w w  .  j  a v a  2  s . c  o  m
 * JBoss, Home of Professional Open Source.
 * Copyright 2011, Red Hat, Inc., and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of
 * the License, or (at your option) any later version.
 *
 * This software 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

import java.lang.reflect.Field;

public class Main {
    /**
     * Find field.
     *
     * @param clazz the class
     * @param fieldName the field name
     * @return field instance
     */
    private static Field findField(Class<?> clazz, String fieldName) {
        if (clazz == null)
            throw new IllegalArgumentException("Null class");
        if (fieldName == null)
            throw new IllegalArgumentException("Null field name");

        try {
            Class<?> current = clazz;
            while (current != null) {
                try {
                    final Field f = current.getDeclaredField(fieldName);
                    f.setAccessible(true);
                    return f;
                } catch (NoSuchFieldException ignored) {
                }
                current = current.getSuperclass();
            }
        } catch (Throwable t) {
            throw new RuntimeException(t);
        }
        throw new IllegalStateException("Couldn't find field: " + clazz.getName() + " / " + fieldName);
    }
}

Related

1. findField(Class clazz, String field, Class type, int index)
2. findField(Class clazz, String fieldName)
3. findField(Class clazz, String fieldName)
4. findField(Class clazz, String fieldName)
5. findField(Class clazz, String fieldName)
6. findField(Class clazz, String fname, boolean isSearchSuperclass)
7. findField(Class clazz, String name)
8. findField(Class clazz, String name)
9. findField(Class clazz, String name)