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

Description

find Field

License

Apache License

Declaration

private static Field findField(Class<?> currentClass, String fieldName) throws Exception 

Method Source Code

//package com.java2s;
/*/*from   w  w  w.  ja v a  2 s.  c om*/
 * Copyright 2012-2013 Alistair Todd
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import java.lang.reflect.Field;

public class Main {
    private static Field findField(Class<?> currentClass, String fieldName) throws Exception {

        while (isUserDefined(currentClass)) {

            try {
                Field f = currentClass.getDeclaredField(fieldName);

                if (f != null) {
                    return f;
                }

            } catch (Exception e) {
                // Ignore
            } finally {
                currentClass = currentClass.getSuperclass();
            }
        }

        throw new Exception();
    }

    /**
     * Is this given class a user defined class not a Java library class?
     * Actually, we just check that this class is not Object.class, because
     * that's generally going to be good enough and not difficult.
     * 
     * @param candidateClass
     *            class to check
     * @return true if currentClass is not Object.
     */
    public static boolean isUserDefined(Class<?> candidateClass) {
        return candidateClass != Object.class;
    }
}

Related

1. findField(Class clazz, String propName)
2. findField(Class clazz, String targetName, Class targetType, boolean checkInheritance, boolean strictType)
3. findField(Class cls, String fieldName)
4. findField(Class cls, String fieldName)
5. findField(Class cls, String fieldName)
6. findField(Class inClass, String fieldName)
7. findField(Class klass, String name)
8. findField(Class pClass, String fieldName)
9. findField(Class targetClass, String fieldName)