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package com.founder.util;

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

/**
 * @author zhunian
 * @create 2018-01-23 13:46
 **/
public class MapUtils {
    /**
     * 将一个 JavaBean 对象转化为一个  Map
     *
     * @param bean 要转化的JavaBean 对象
     * @return 转化出来的  Map 对象
     * @throws IntrospectionException    如果分析类属性失败
     * @throws IllegalAccessException    如果实例化 JavaBean 失败
     * @throws InvocationTargetException 如果调用属性的 setter 方法失败
     */
    public static Map convertBean(Object bean)
            throws IntrospectionException, IllegalAccessException, InvocationTargetException {
        Class type = bean.getClass();
        Map returnMap = new HashMap();
        BeanInfo beanInfo = Introspector.getBeanInfo(type);

        PropertyDescriptor[] propertyDescriptors = beanInfo.getPropertyDescriptors();
        for (int i = 0; i < propertyDescriptors.length; i++) {
            PropertyDescriptor descriptor = propertyDescriptors[i];
            String propertyName = descriptor.getName();
            if (!propertyName.equals("class")) {
                Method readMethod = descriptor.getReadMethod();
                Object result = readMethod.invoke(bean, new Object[0]);
                if ("class java.util.Date".equals(descriptor.getPropertyType().toString())) {
                    //System.out.println("转换日期：" + result);
                    result = com.founder.util.DateUtils.date2Str((Date) result);
                }
                if (result != null) {
                    returnMap.put(propertyName, result);
                } else {
                    returnMap.put(propertyName, "");
                }
            }
        }
        return returnMap;
    }

    /**
     * 将一个 Map 对象转化为一个 JavaBean
     *
     * @param type 要转化的类型
     * @param map  包含属性值的 map
     * @return 转化出来的 JavaBean 对象
     * @throws IntrospectionException    如果分析类属性失败
     * @throws IllegalAccessException    如果实例化 JavaBean 失败
     * @throws InstantiationException    如果实例化 JavaBean 失败
     * @throws InvocationTargetException 如果调用属性的 setter 方法失败
     */
    @SuppressWarnings("rawtypes")
    public static Object convertMap(Class type, Map map)
            throws IntrospectionException, IllegalAccessException,
            InstantiationException, InvocationTargetException {
        BeanInfo beanInfo = Introspector.getBeanInfo(type); // 获取类属性
        Object obj = type.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。
                try {
                    Object value = map.get(propertyName);
                    Object[] args = new Object[1];
                    args[0] = value;
                    descriptor.getWriteMethod().invoke(obj, args);
                } catch (IllegalAccessException e) {
                    //e.printStackTrace();
                } catch (IllegalArgumentException e) {
                    //e.printStackTrace();
                } catch (InvocationTargetException e) {
                    //e.printStackTrace();
                }
            }
        }
        return obj;
    }
}