com.star.reflect.FieldUtil Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of common Show documentation
some utility class for java develop
The newest version!
package com.star.reflect;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

import com.star.exception.pojo.ToolException;
import com.star.lang.Assert;
import com.star.string.StringUtil;

/**
 * 属性工具类
 * 
 * @author starhq
 *
 */
public final class FieldUtil {

	private FieldUtil() {
	}

	/**
	 * 
	 * 直接读取对象属性值,无视private/protected修饰符,不经过getter函数.
	 * 
	 */
	public static Object getFieldValue(final Object object, final String fieldName) {
		final Field field = getDeclaredField(object, fieldName);

		Assert.notNull(field, StringUtil.format("colud not get filed {} on target {}", fieldName, object));

		makeAccessible(field);

		Object result = null;
		try {
			result = field.get(object);
		} catch (IllegalAccessException e) {
			throw new ToolException(
					StringUtil.format("get filed {}'s value failure,the reason is: {}", fieldName, e.getMessage()), e);
		}
		return result;
	}

	/**
	 * 
	 * 直接设置对象属性值,无视private/protected修饰符,不经过setter函数.
	 * 
	 */
	public static void setFieldValue(final Object object, final String fieldName, final Object value) {
		final Field field = getDeclaredField(object, fieldName);

		Assert.notNull(field, StringUtil.format("colud not get filed {} on target {}", fieldName, object));

		makeAccessible(field);

		try {
			field.set(object, value);
		} catch (IllegalAccessException e) {
			throw new ToolException(
					StringUtil.format("set filed {}'s value failure,the reason is: {}", fieldName, e.getMessage()), e);
		}
	}

	/**
	 * 
	 * 循环向上转型,获取对象的DeclaredField.
	 * 
	 */
	public static Field getDeclaredField(final Object object, final String fieldName) {
		return getDeclaredField(object.getClass(), fieldName);
	}

	/**
	 * 
	 * 循环向上转型,获取类的DeclaredField.
	 * 
	 */
	@SuppressWarnings({ "rawtypes", "unused" })
	public static Field getDeclaredField(final Class clazz, final String fieldName) {
		Assert.notNull(clazz, "get declared filed failure,the clazz is null");
		Assert.notBlank(fieldName, "get declared filed failure,the fieldName is blank");
		for (Class superClass = clazz; superClass != Object.class; superClass = superClass.getSuperclass()) {
			try {
				return superClass.getDeclaredField(fieldName);
			} catch (NoSuchFieldException e) {
				throw new ToolException(
						StringUtil.format("get declared filed fialure,the reason is: {}", e.getMessage()), e);
			}
		}
		return null;
	}

	/**
	 * 
	 * 强制转换fileld可访问.
	 * 
	 */
	public static void makeAccessible(final Field field) {
		if (!Modifier.isPublic(field.getModifiers()) || !Modifier.isPublic(field.getDeclaringClass().getModifiers())) {
			field.setAccessible(true);
		}
	}
}