package org.springblade.utils;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Tools {

	private static Pattern linePattern = Pattern.compile("_(\\w)");

	/** 下划线转驼峰 */
	public static String lineToHump(String str) {
		str = str.toLowerCase();
		Matcher matcher = linePattern.matcher(str);
		StringBuffer sb = new StringBuffer();
		while (matcher.find()) {
			matcher.appendReplacement(sb, matcher.group(1).toUpperCase());
		}
		matcher.appendTail(sb);
		return sb.toString();
	}

	/** 驼峰转下划线(简单写法，效率低于{@link #humpToLine2(String)}) */
	public static String humpToLine(String str) {
		return str.replaceAll("[A-Z]", "_$0").toLowerCase();
	}

	private static Pattern humpPattern = Pattern.compile("[A-Z]");

	/** 驼峰转下划线,效率比上面高 */
	public static String humpToLine2(String str) {
		Matcher matcher = humpPattern.matcher(str);
		StringBuffer sb = new StringBuffer();
		while (matcher.find()) {
			matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
		}
		matcher.appendTail(sb);
		return sb.toString();
	}

	/**
	 * Map转成实体对象
	 * @param map map实体对象包含属性
	 * @param clazz 实体对象类型
	 * @return
	 */
	public static Object map2Object(Map<String, Object> map, Class<?> clazz) {
		if (map == null) {
			return null;
		}
		Object obj = null;
		try {
			obj = clazz.newInstance();
			Field[] fields = obj.getClass().getDeclaredFields();
			for (Field field : fields) {
				int mod = field.getModifiers();
				if (Modifier.isStatic(mod) || Modifier.isFinal(mod)) {
					continue;
				}
				field.setAccessible(true);
				field.set(obj, map.get(humpToLine2(field.getName())));
			}
		} catch (Exception e) {
			e.printStackTrace();
		}
		return obj;
	}

	public static void main(String[] args) {
		String lineToHump = lineToHump("f_parent_no_leader");
		System.out.println(lineToHump);// fParentNoLeader
		System.out.println(humpToLine(lineToHump));// f_parent_no_leader
		System.out.println(humpToLine2(lineToHump));// f_parent_no_leader
	}
}
