package com.walker.jdbc.generator.util;
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public class StringUtils {
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private static final String TEXT_UNDERLINE = "_";
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private static final char CHAR_UNDERLINE = '_';
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private static final String TEXT_EMPTY = "";
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/**
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* 把带下划线的字符串，转换成JAVA驼峰式字符串。
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* <pre>
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* 如：sm_my_name --> SmMyName
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* </pre>
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* @param underlineName 原始字符串
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* @param upperFirstChar 首字母是否大写
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* @return
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* @author 时克英
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* @date 2023-03-23
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*/
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public static final String transferUnderlineName2Camel(String underlineName, boolean upperFirstChar){
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if(underlineName == null || underlineName.equals(TEXT_EMPTY)){
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throw new IllegalArgumentException("underlineName不能为空!");
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}
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int index = underlineName.indexOf(TEXT_UNDERLINE);
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if(index == 0){
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// 首字母就是下划线，不处理
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return underlineName;
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} else if(index < 0){
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// 没有找到下划线，默认首字母大写
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if(upperFirstChar){
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return toUpperCaseFirst(underlineName);
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} else {
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return underlineName;
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}
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} else {
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// 存在至少一个下划线
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StringBuilder text = new StringBuilder();
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int count = underlineName.length();
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char c = 0;
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int startUpperCase = 0;
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for(int i=0; i<count; i++){
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c = underlineName.charAt(i);
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if(startUpperCase == 0){
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if(i == 0){
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if(upperFirstChar){
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text.append(String.valueOf(c).toUpperCase());
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} else {
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text.append(c);
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}
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} else {
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text.append(String.valueOf(c).toUpperCase());
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}
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startUpperCase ++;
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continue;
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}
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if(c == CHAR_UNDERLINE){
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// 下划线，复位计数器，不写入字符串
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startUpperCase = 0;
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continue;
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}
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// 其他字符串正常写入
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text.append(c);
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}
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return text.toString();
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}
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}
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public static int intValue(Object obj)
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{
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if (obj == null) {
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return 0;
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}
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if ((obj instanceof Number)) {
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return ((Number)obj).intValue();
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}
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return Integer.parseInt(obj.toString());
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}
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public static boolean isEmpty(String str)
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{
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return (str == null) || (TEXT_EMPTY.equals(str));
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}
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public static boolean isNotEmpty(String str) {
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return !isEmpty(str);
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}
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public static String join(String[] src, String separator, String quot) {
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StringBuffer sb = new StringBuffer();
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for (int i = 0; i < src.length; i++) {
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if ((i > 0) && (separator != null)) {
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sb.append(separator);
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}
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if (quot != null) {
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sb.append(quot);
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}
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sb.append(src[i]);
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if (quot != null) {
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sb.append(quot);
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}
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}
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return sb.toString();
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}
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public static String safeToString(Object obj) {
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if (obj == null) {
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return null;
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}
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return obj.toString();
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}
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public static String les(Object obj, int len)
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{
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if ((obj == null) || (obj.toString() == null)) {
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return null;
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}
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if (obj.toString().length() > len) {
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return obj.toString().substring(0, len);
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}
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return obj.toString();
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}
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public static String toLowerCaseFirst(String str)
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{
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if (isEmpty(str)) {
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return str;
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}
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char[] chs = str.toCharArray();
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chs[0] = Character.toLowerCase(chs[0]);
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return String.valueOf(chs);
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}
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public static String toUpperCaseFirst(String str) {
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if (isEmpty(str)) {
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return str;
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}
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char[] chs = str.toCharArray();
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chs[0] = Character.toUpperCase(chs[0]);
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return String.valueOf(chs);
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}
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public static String getJavaType(String strTemp) {
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String strJavaType = "";
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strTemp = strTemp.toLowerCase();
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System.out.print(strTemp);
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if(strTemp.indexOf("bigint") >= 0){
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strJavaType = "Long";
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} else if (strTemp.indexOf("int") >= 0 || strTemp.indexOf("tinyint") >= 0)
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strJavaType = "Integer";
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else if (strTemp.indexOf("longtext") >= 0) {
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strJavaType = "String";
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} else if (strTemp.indexOf("varchar") >= 0) {
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strJavaType = "String";
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} else if (strTemp.indexOf("long") >= 0)
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strJavaType = "Long";
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else if (strTemp.indexOf("float") >= 0)
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strJavaType = "Float";
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else if (strTemp.indexOf("double") >= 0)
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strJavaType = "Double";
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else if (strTemp.indexOf("boolean") >= 0 || strTemp.indexOf("bit") >= 0)
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strJavaType = "Boolean";
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else if (strTemp.indexOf("string") >= 0)
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strJavaType = "String";
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else if (strTemp.indexOf("date") >= 0)
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strJavaType = "java.util.Date";
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else if (strTemp.indexOf("clob") >= 0)
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strJavaType = "String";
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else if (strTemp.indexOf("text") >= 0)
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strJavaType = "String";
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else if (strTemp.indexOf("blob") >= 0)
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strJavaType = "String";
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else if (strTemp.indexOf("char") >= 0)
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strJavaType = "String";
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else if (strTemp.indexOf("number") >= 0)
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strJavaType = "Integer";
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else if (strTemp.indexOf("materialized_clob") >= 0)
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strJavaType = "String";
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else if (strTemp.indexOf("materialized_blob") >= 0)
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strJavaType = "byte[]";
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else if (strTemp.indexOf("big_decimal") >= 0 || strTemp.indexOf("decimal") >= 0)
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strJavaType = "java.math.BigDecimal";
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else if (strTemp.indexOf("numeric") >= 0)
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strJavaType = "Double";
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else {
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throw new RuntimeException(strTemp + "没有对应的java类型！");
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}
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return strJavaType;
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}
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public static void main(String[] args){
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// String input = "s_user_core";
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// String input = "_show_error";
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// String input = "Thisnone";
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// String input = "create_time";
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// String input = "etaa_question_type";
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String input = "etaa_question_";
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String result = transferUnderlineName2Camel(input, false);
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System.out.println(result);
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}
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}
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