Java Reflection Field Set setField(Object owner, String name, Object newValue, Class definedIn)

Description

set Field

License

Open Source License

Declaration

public static void setField(Object owner, String name, Object newValue, Class<?> definedIn)
            throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2013 Red Hat, Inc.//  w  w w .  ja  v  a  2  s.  co  m
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is made available under the terms of the
 * Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Red Hat, Inc. - initial API and implementation
 ******************************************************************************/

import java.lang.reflect.Field;

public class Main {
    public static void setField(Object owner, String name, Object newValue, Class<?> definedIn)
            throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
        Field field = getFieldDescriptor(owner, name, definedIn);
        field.set(owner, newValue);
    }

    public static Field getFieldDescriptor(Object instance, String fieldName) throws NoSuchFieldException {
        Class<? extends Object> aClass = instance.getClass();
        while (true) {
            try {
                return getFieldDescriptor(instance, fieldName, aClass);
            } catch (NoSuchFieldException e) {
                if (aClass != Object.class) {
                    Class<?> superclass = aClass.getSuperclass();
                    if (superclass != null && superclass != Object.class && superclass != aClass) {
                        aClass = superclass;
                        continue;
                    }
                }
                throw e;
            }
        }
    }

    public static Field getFieldDescriptor(Object instance, String fieldName, Class<? extends Object> aClass)
            throws NoSuchFieldException {
        notNull(instance, "instance");
        Field field = aClass.getDeclaredField(fieldName);
        field.setAccessible(true);
        return field;
    }

    public static <T> T notNull(T value, String message) {
        if (value == null) {
            throw new IllegalArgumentException(message);
        }
        return value;
    }

    public static Field getDeclaredField(Class<?> aClass, String name) throws NoSuchFieldException {
        try {
            return aClass.getDeclaredField(name);
        } catch (NoSuchFieldException e) {
            Class<?> superclass = aClass.getSuperclass();
            if (aClass == Object.class || superclass == null) {
                throw e;
            } else {
                return getDeclaredField(superclass, name);
            }
        }
    }
}

Related

1. setField(Object object, String fieldName, Object value)
2. setField(Object object, String fieldName, Object value)
3. setField(Object object, String name, boolean value)
4. setField(Object object, String name, Object value)
5. setField(Object object, String name, Object value)
6. setField(Object owner, String targetClass, String fieldName, Object value)
7. setField(Object service, String name, Object obj)
8. setField(Object source, String fieldName, Object value)
9. setField(Object sourceObj, Object targetObj, Field valueField, List targetFields)