cn.cliveyuan.robin.generator.util.GeneratorUtils Maven / Gradle / Ivy

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package cn.cliveyuan.robin.generator.util;

import org.apache.commons.lang3.StringUtils;

import java.util.Objects;

/**
 * 生成工具类
 *
 * @author Clive Yuan
 * @date 2020/09/09
 */
public class GeneratorUtils {

    /**
     * 获取小写驼峰名
     *
     *  user -> user 
     *  User -> user 
     *  USER -> user 
     *  UsER -> usER 
     *  TemplateEnterprise -> templateEnterprise 
     *  t_user_info -> tUserInfo 
     *  user_list_detail -> userListDetail 
     *  USER_LIST_DETAIL -> userListDetail 
     *
     * @param str 字符串
     * @return
     */
    public static String getLowerCamelName(String str) {
        // 全大写, 包含下划线
        Objects.requireNonNull(str, "str can't be null");
        if (str.contains("_")) {
            return StringUtils.uncapitalize(lineToHump(str));
        }
        if (StringUtils.isAllUpperCase(str)) {
            return str.toLowerCase();
        }
        return StringUtils.uncapitalize(str);
    }

    public static String lineToHump(String name) {
        // return CaseFormat.UPPER_UNDERSCORE.to(CaseFormat.UPPER_CAMEL, str.toUpperCase());
        if (null == name || name.length() == 0) {
            return null;
        }

        int length = name.length();
        StringBuilder sb = new StringBuilder(length);
        boolean underLineNextChar = false;

        for (int i = 0; i < length; ++i) {
            char c = name.charAt(i);
            if (c == '_') {
                underLineNextChar = true;
            } else if (underLineNextChar) {
                sb.append(Character.toUpperCase(c));
                underLineNextChar = false;
            } else {
                sb.append(c);
            }
        }

        return sb.toString();
    }
}