Java Reflection Field Value Set setFieldValue(Object obj, String field, Object value)

Description

set Field Value

License

Open Source License

Declaration

public static void setFieldValue(Object obj, String field, Object value) 

Method Source Code

//package com.java2s;
//License from project: Open Source License 

import java.lang.reflect.Field;

import java.util.HashMap;

import java.util.Map;

public class Main {
    static Map<Class<?>, Map<String, Field>> cache = new HashMap<Class<?>, Map<String, Field>>();

    public static void setFieldValue(Object obj, String field, Object value) {
        setFieldValue(obj, getField(obj.getClass(), field), value);
    }// ww w  .j ava2s  .  c o  m

    public static void setFieldValue(Object obj, Field field, Object value) {
        try {
            boolean accessible = field.isAccessible();
            field.setAccessible(true);
            field.set(obj, value);
            field.setAccessible(accessible);
        } catch (IllegalArgumentException e) {
            throw new RuntimeException("IllegalArgumentException", e);
        } catch (IllegalAccessException e) {
            throw new RuntimeException("IllegalAccessExceptione", e);
        }
    }

    /**
     * Gets field from class cls, either declared in cls or in one
     * of its superclasses
     *
     * @param cls - declaring class of the field
     * @param fieldName - name of the field
     * @return requested field
     */
    public static Field getField(Class<?> cls, String fieldName) {
        Field f = null;
        Map<String, Field> inner = cache.get(cls);
        if (inner != null) {
            f = inner.get(fieldName);
            if (f != null)
                return f;
        } else {
            inner = new HashMap<String, Field>();
            cache.put(cls, inner);
        }

        try {
            while (cls != null) {
                try {
                    f = cls.getDeclaredField(fieldName);
                    f.setAccessible(true);
                } catch (NoSuchFieldException e) {
                    f = null;
                }
                if (f != null)
                    break;
                cls = cls.getSuperclass();
            }

        } catch (SecurityException e) {
            throw new RuntimeException("SecurityException", e);
        }
        if (f != null) {
            inner.put(fieldName, f);
        }
        return f;
    }
}

Related

1. setFieldValue(Object o, Class baseClass, Class fieldType, T value)
2. SetFieldValue(Object o, String field, Object object)
3. setFieldValue(Object obj, Field f, Object value)
4. setFieldValue(Object obj, Field field, Object value)
5. setFieldValue(Object obj, Field field, Object value)
6. setFieldValue(Object obj, String fieldName, Object value)
7. setFieldValue(Object obj, String fieldname, Object value)
8. setFieldValue(Object obj, String fieldName, Object value)
9. setFieldValue(Object obj, String fieldName, Object value)