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/*
 * Copyright (c) 2018-2019.‭‭‭‭‭‭‭‭‭‭‭‭[zuoqinggang] www.pingfangushi.com
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */


package cn.smallbun.scaffold.framework.common.toolkit;

import java.lang.reflect.Field;

/**
 * 实体类操作工具类
 * @author SanLi
 * Created by [email protected] on 2018/11/11 16:05
 */
public class EntityUtil {

	/**
	 * 复制名称相同类型相同字段的值
	 *
	 * @param obj
	 * @param clazz2
	 * @param 
	 * @param 
	 * @return Object
	 */
	public static  T2 copyData(T1 obj, Class clazz2) {
		//1. 获取源数据的类
		//源数据类
		Class clazz1 = obj.getClass();
		//2. 创建一个目标数据实例
		final T2 obj2 = getInstance(clazz2);

		//3. 获取clazz1和clazz2中的属性
		Field[] fields1 = clazz1.getDeclaredFields();
		Field[] fields2 = clazz2.getDeclaredFields();
		//4. 遍历fields2
		for (Field f1 : fields1) {
			//4-1. 遍历fields1，逐字段匹配
			for (Field f2 : fields2) {
				// 复制字段
				copyField(obj, obj2, f1, f2);
			}
		}
		return obj2;
	}

	/**
	 * 按照字段表复制相同名称相同类型的字段的值
	 *
	 * @param obj
	 * @param clazz2
	 * @param fieldNames
	 * @param 
	 * @param 
	 * @return Object
	 */
	public static  T2 copyData(T1 obj, Class clazz2, String[] fieldNames) {
		//1. 获取源数据的类
		//源数据类
		Class clazz1 = obj.getClass();
		//2. 创建一个目标数据实例
		final T2 obj2 = getInstance(clazz2);

		//3. 获取clazz1和clazz2中的属性
		Field[] fields1 = clazz1.getDeclaredFields();
		Field[] fields2 = clazz2.getDeclaredFields();

		//4. 遍历字段列表
		for (String fieldName : fieldNames) {
			//5. 遍历fields1
			for (Field f1 : fields1) {
				//找到这个字段（找不到就不用遍历fields2）
				if (fieldName.equals(f1.getName())) {
					//5-1. 遍历fields2，逐字段匹配
					for (Field f2 : fields2) {
						//在fields2中也要有这个字段
						if (fieldName.equals(f2.getName())) {
							//复制字段
							copyField(obj, obj2, f1, f2);
						}
					}
				}
			}
		}
		return obj2;
	}

	/**
	 * 复制相同名称相同类型的字段的值
	 *
	 * @param obj
	 * @param obj2
	 * @param f1
	 * @param f2
	 * @param 
	 * @param 
	 */
	private static  void copyField(T1 obj, T2 obj2, Field f1, Field f2) {
		try {
			//字段名要相同，字段类型也要相同
			if (f1.getName().equals(f2.getName()) & f1.getType().getName().equals(f2.getType().getName())) {
				//3-2. 获取obj这个字段的值
				f1.setAccessible(true);
				Object val = f1.get(obj);
				//3-3. 把这个值赋给obj2这个字段
				f2.setAccessible(true);
				f2.set(obj2, val);
				//3-4. 访问权限还原
				f2.setAccessible(false);
				f1.setAccessible(false);
			}
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		}
	}

	/**
	 * 获得泛型类的实例
	 *
	 * @param tClass
	 * @param 
	 * @return Object
	 */
	public static  T getInstance(Class tClass) {
		try {
			return tClass.newInstance();
		} catch (InstantiationException | IllegalAccessException e) {
			e.printStackTrace();
		}
		return null;
	}
}