/**
* Copyright (c) 2011-2014, hubin (jobob@qq.com).
* <p>
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
* <p>
* http://www.apache.org/licenses/LICENSE-2.0
* <p>
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*/
package com.baomidou.mybatisplus.toolkit;
import java.util.Collection;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import com.baomidou.mybatisplus.enums.SQLlikeType;
/**
* <p>
* String 工具类
* </p>
*
* @author D.Yang
* @Date 2016-08-18
*/
public class StringUtils {
/**
* 空字符
*/
public static final String EMPTY = "";
/**
* 下划线字符
*/
public static final char UNDERLINE = '_';
/**
* 占位符
*/
public static final String PLACE_HOLDER = "{%s}";
/**
* <p>
* 判断字符串是否为空
* </p>
*
* @param cs
* 需要判断字符串
* @return 判断结果
*/
public static boolean isEmpty(final CharSequence cs) {
int strLen;
if (cs == null || (strLen = cs.length()) == 0) {
return true;
}
for (int i = 0; i < strLen; i++) {
if (Character.isWhitespace(cs.charAt(i)) == false) {
return false;
}
}
return true;
}
/**
* <p>
* 判断字符串是否不为空
* </p>
*
* @param cs
* 需要判断字符串
* @return 判断结果
*/
public static boolean isNotEmpty(final CharSequence cs) {
return !isEmpty(cs);
}
/**
* <p>
* 字符串驼峰转下划线格式
* </p>
*
* @param param
* 需要转换的字符串
* @return 转换好的字符串
*/
public static String camelToUnderline(String param) {
if (isEmpty(param)) {
return EMPTY;
}
int len = param.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c = param.charAt(i);
if (Character.isUpperCase(c) && i > 0) {
sb.append(UNDERLINE);
}
sb.append(Character.toLowerCase(c));
}
return sb.toString();
}
/**
* <p>
* 字符串下划线转驼峰格式
* </p>
*
* @param param
* 需要转换的字符串
* @return 转换好的字符串
*/
public static String underlineToCamel(String param) {
if (isEmpty(param)) {
return EMPTY;
}
String temp = param.toLowerCase();
int len = temp.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c = temp.charAt(i);
if (c == UNDERLINE) {
if (++i < len) {
sb.append(Character.toUpperCase(temp.charAt(i)));
}
} else {
sb.append(c);
}
}
return sb.toString();
}
/**
* <p>
* 判断字符串是否为纯大写字母
* </p>
*
* @param str
* 要匹配的字符串
* @return
*/
public static boolean isUpperCase(String str) {
return match("^[A-Z]+$", str);
}
/**
* <p>
* 正则表达式匹配
* </p>
*
* @param regex
* 正则表达式字符串
* @param str
* 要匹配的字符串
* @return 如果str 符合 regex的正则表达式格式,返回true, 否则返回 false;
*/
public static boolean match(String regex, String str) {
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher(str);
return matcher.matches();
}
/**
* <p>
* SQL 参数填充
* </p>
*
* @param content
* 填充内容
* @param args
* 填充参数
* @return
*/
public static String sqlArgsFill(String content, Object... args) {
if (null == content) {
return null;
}
if (args != null) {
int length = args.length;
if (length >= 1) {
for (int i = 0; i < length; i++) {
// 改造 String.replace() 用法
content = Pattern.compile(String.format(PLACE_HOLDER, i), Pattern.LITERAL).matcher(content)
.replaceAll(sqlParam(args[i]));
}
}
}
return content;
}
/**
* 获取SQL PARAMS字符串
*
* @param obj
* @return
*/
public static String sqlParam(Object obj) {
String repStr;
if (obj instanceof Collection) {
repStr = StringUtils.quotaMarkList((Collection<?>) obj);
} else {
repStr = StringUtils.quotaMark(obj);
}
return repStr;
}
/**
* <p>
* 使用单引号包含字符串
* </p>
*
* @param obj
* 原字符串
* @return 单引号包含的原字符串
*/
public static String quotaMark(Object obj) {
String srcStr = String.valueOf(obj);
if (obj instanceof String) {
// fix #79
return StringEscape.escapeString(srcStr);
}
return srcStr;
}
/**
* <p>
* 用%连接like
* </p>
*
* @param str
* 原字符串
* @return
*/
public static String concatLike(String str, SQLlikeType type) {
switch (type) {
case LEFT:
str = "%" + str;
break;
case RIGHT:
str += "%";
break;
default:
str = "%" + str + "%";
}
return StringEscape.escapeString(str);
}
/**
* <p>
* 使用单引号包含字符串
* </p>
*
* @param coll
* 集合
* @return 单引号包含的原字符串的集合形式
*/
public static String quotaMarkList(Collection<?> coll) {
StringBuilder sqlBuild = new StringBuilder();
sqlBuild.append("(");
int _size = coll.size();
int i = 0;
Iterator<?> iterator = coll.iterator();
while (iterator.hasNext()) {
String tempVal = StringUtils.quotaMark(iterator.next());
if (i + 1 == _size) {
sqlBuild.append(tempVal);
} else {
sqlBuild.append(tempVal);
sqlBuild.append(",");
}
i++;
}
sqlBuild.append(")");
return sqlBuild.toString();
}
/**
* <p>
* 拼接字符串第二个字符串第一个字母大写
* </p>
*
* @param concatStr
* @param str
* @return
*/
public static String concatCapitalize(String concatStr, final String str) {
if (isEmpty(concatStr)) {
concatStr = EMPTY;
}
int strLen;
if (str == null || (strLen = str.length()) == 0) {
return str;
}
final char firstChar = str.charAt(0);
if (Character.isTitleCase(firstChar)) {
// already capitalized
return str;
}
StringBuilder sb = new StringBuilder(strLen);
sb.append(concatStr);
sb.append(Character.toTitleCase(firstChar));
sb.append(str.substring(1));
return sb.toString();
}
/**
* <p>
* 字符串第一个字母大写
* </p>
*
* @param str
* @return
*/
public static String capitalize(final String str) {
return concatCapitalize(null, str);
}
/**
* <p>
* 判断对象是否为空
* </p>
*
* @param object
* @return
*/
public static boolean checkValNotNull(Object object) {
if (object instanceof CharSequence) {
return isNotEmpty((CharSequence) object);
}
return object == null ? false : true;
}
/**
* <p>
* 判断对象是否为空
* </p>
*
* @param object
* @return
*/
public static boolean checkValNull(Object object) {
return !checkValNotNull(object);
}
// endsWith
// -----------------------------------------------------------------------
/**
* <p>
* Check if a String ends with a specified suffix.
* </p>
*
* <p>
* <code>null</code>s are handled without exceptions. Two <code>null</code>
* references are considered to be equal. The comparison is case sensitive.
* </p>
*
* <pre>
* StringUtils.endsWith(null, null) = true
* StringUtils.endsWith(null, "abcdef") = false
* StringUtils.endsWith("def", null) = false
* StringUtils.endsWith("def", "abcdef") = true
* StringUtils.endsWith("def", "ABCDEF") = false
* </pre>
*
* @see java.lang.String#endsWith(String)
* @param str
* the String to check, may be null
* @param suffix
* the suffix to find, may be null
* @return <code>true</code> if the String ends with the suffix, case
* sensitive, or both <code>null</code>
* @since 2.4
*/
public static boolean endsWith(String str, String suffix) {
return endsWith(str, suffix, false);
}
/**
* <p>
* Case insensitive check if a String ends with a specified suffix.
* </p>
*
* <p>
* <code>null</code>s are handled without exceptions. Two <code>null</code>
* references are considered to be equal. The comparison is case
* insensitive.
* </p>
*
* <pre>
* StringUtils.endsWithIgnoreCase(null, null) = true
* StringUtils.endsWithIgnoreCase(null, "abcdef") = false
* StringUtils.endsWithIgnoreCase("def", null) = false
* StringUtils.endsWithIgnoreCase("def", "abcdef") = true
* StringUtils.endsWithIgnoreCase("def", "ABCDEF") = false
* </pre>
*
* @see java.lang.String#endsWith(String)
* @param str
* the String to check, may be null
* @param suffix
* the suffix to find, may be null
* @return <code>true</code> if the String ends with the suffix, case
* insensitive, or both <code>null</code>
* @since 2.4
*/
public static boolean endsWithIgnoreCase(String str, String suffix) {
return endsWith(str, suffix, true);
}
/**
* <p>
* Check if a String ends with a specified suffix (optionally case
* insensitive).
* </p>
*
* @see java.lang.String#endsWith(String)
* @param str
* the String to check, may be null
* @param suffix
* the suffix to find, may be null
* @param ignoreCase
* inidicates whether the compare should ignore case (case
* insensitive) or not.
* @return <code>true</code> if the String starts with the prefix or both
* <code>null</code>
*/
private static boolean endsWith(String str, String suffix, boolean ignoreCase) {
if (str == null || suffix == null) {
return (str == null && suffix == null);
}
if (suffix.length() > str.length()) {
return false;
}
int strOffset = str.length() - suffix.length();
return str.regionMatches(ignoreCase, strOffset, suffix, 0, suffix.length());
}
}