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

Description

find Field

License

Apache License

Declaration

public static Field findField(Class<?> targetClass, String fieldName) 

Method Source Code

//package com.java2s;
/*/*w ww.  jav a 2  s  .  c  om*/
 * Copyright 2013-2015 the original author or authors.
 *
 * 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;

import java.lang.reflect.Method;

public class Main {
    public static Field findField(Object target, String fieldName) {
        Class<?> clz = target.getClass();
        return findField(clz, fieldName);
    }

    public static Field findField(Class<?> targetClass, String fieldName) {
        Field theField;
        try {
            theField = targetClass.getDeclaredField(fieldName);
            return accessible(theField);
        } catch (NoSuchFieldException e) {
            if (targetClass.getSuperclass() != null)
                return findField(targetClass.getSuperclass(), fieldName);
            else
                return null;
        }
    }

    public static Field findField(Object obj, String fieldName, Class<?> type) {
        if (obj == null)
            return null;
        Field theField = findField(obj.getClass(), fieldName);
        if (isFieldType(theField, type))
            return theField;
        return null;
    }

    public static Field findField(Class<?> targetClass, String fieldName, Class<?> type) {
        Field theField = findField(targetClass, fieldName);
        if (isFieldType(theField, type))
            return theField;
        return null;
    }

    public static Method accessible(Method method) {
        if (method != null) {
            if (!method.isAccessible())
                method.setAccessible(true);
        }
        return method;
    }

    public static Field accessible(Field theField) {
        if (theField != null) {
            if (!theField.isAccessible())
                theField.setAccessible(true);
        }
        return theField;
    }

    public static boolean isFieldType(Field field, Class<?> clz) {
        if (field != null) {
            Class<?> type = field.getType();
            if (type.isAssignableFrom(clz)) {
                return true;
            }
        }
        return false;
    }
}

Related

1. findField(Class cls, String fieldName)
2. findField(Class currentClass, String fieldName)
3. findField(Class inClass, String fieldName)
4. findField(Class klass, String name)
5. findField(Class pClass, String fieldName)
6. findField(Class type, Class annotationClass)
7. findField(Class type, String fieldName)
8. findField(final Class aClass, final String fieldName)
9. findField(final Class clazz, final String name)