package com.consum.base.util;

import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class MapUtils {

    public static <T> T convertMapToObj(Map<String, Object> map, Class<T> clazz) {
        try {
            T obj = clazz.newInstance();
            for (Map.Entry<String, Object> entry : map.entrySet()) {
                Field field = clazz.getDeclaredField(entry.getKey());
                field.setAccessible(true);
                field.set(obj, entry.getValue());
            }
            return obj;
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (NoSuchFieldException e) {
            e.printStackTrace();
        }
        return null;
    }


    public static final char UNDERLINE = '_';

    /**
     * 把map的key转换成驼峰命名
     *
     * @param map
     * @return
     */
    public static Map<String, Object> toReplaceKeyLow(Map<String, Object> map) {
        Map reMap = new HashMap();

        if (map != null) {
            Iterator var2 = map.entrySet().iterator();

            while (var2.hasNext()) {
                Map.Entry<String, Object> entry = (Map.Entry) var2.next();
                reMap.put(underlineToCamel((String) entry.getKey()), map.get(entry.getKey()));
            }

            map.clear();
        }

        return reMap;
    }


    /**
     * 将下划线转为驼峰格式
     *
     * @param param
     * @return
     */
    public static String underlineToCamel(String param) {
        if (param == null || "".equals(param.trim())) {
            return "";
        }
        int len = param.length();
        StringBuilder sb = new StringBuilder(len);

        for (int i = 0; i < len; i++) {
            char c = param.charAt(i);
            if (c == UNDERLINE) {
                if (++i < len) {
                    sb.append(Character.toUpperCase(param.charAt(i)));
                }
            } else {
                sb.append(Character.toLowerCase(param.charAt(i)));
            }
        }
        return sb.toString();
    }


}