package com.zhiwei.manage.util;

import java.beans.BeanInfo;
import java.beans.IntrospectionException;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;
import java.lang.reflect.InvocationTargetException;
import java.util.Date;
import java.util.List;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.zhiwei.manage.bean.Data;
import com.zhiwei.manage.bean.EasyNews;

/**
 * 转换工具类
 * 
 * @author Administrator
 *
 */
public class Change {

	public static Data changeNewsToDate(List<EasyNews> list, Date date) {
		Data d = new Data();
		d.setTime(date);
		for (EasyNews n : list) {
			d.setSource(n.getSource());
			d.setCount(d.getCount() + 1);
		}
		return d;
	}

	/**
	 * map转换成实体
	 * 
	 * @param clazz
	 * @param map
	 * @return
	 */
	public static <T> T toBean(Class<T> clazz, Map map) {
		T obj = null;
		try {
			BeanInfo beanInfo = Introspector.getBeanInfo(clazz);
			obj = clazz.newInstance(); // 创建 JavaBean 对象
			// 给 JavaBean 对象的属性赋值
			PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
			for (int i = 0; i < propertyDescriptors.length; i++) {
				PropertyDescriptor descriptor = propertyDescriptors[i];
				String propertyName = descriptor.getName();
				if (map.containsKey(propertyName)) {
					// 下面一句可以 try 起来，这样当一个属性赋值失败的时候就不会影响其他属性赋值。
					Object value = map.get(propertyName);
					if ("".equals(value)) {
						value = null;
					}
					Object[] args = new Object[1];
					args[0] = value;
					try {
						descriptor.getWriteMethod().invoke(obj, value);
					} catch (InvocationTargetException e) {
						System.out.println("字段映射失败");
					}
				}
			}
		} catch (IllegalAccessException e) {
			System.out.println("实例化 JavaBean 失败");
		} catch (IntrospectionException e) {
			System.out.println("分析类属性失败");
		} catch (IllegalArgumentException e) {
			System.out.println("映射错误");
		} catch (InstantiationException e) {
			System.out.println("实例化 JavaBean 失败");
		}
		return (T) obj;
	}

}
