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Code Issues Actions 6 Packages Projects Releases Wiki Activity

Improve performance of StringUtils.capitalize() 

Issue: SPR-15094
This commit is contained in:
Juergen Hoeller 2017-01-12 22:51:56 +01:00
parent c5500b2332
commit 5982f732b4
1 changed files with 15 additions and 8 deletions
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23
spring-core/src/main/java/org/springframework/util/StringUtils.java
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@ -1,5 +1,5 @@
/*
* Copyright 2002-2016 the original author or authors.
* Copyright 2002-2017 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -516,15 +516,22 @@ public abstract class StringUtils {
if (str == null || str.length() == 0) {
return str;
}
StringBuilder sb = new StringBuilder(str.length());
if (capitalize) {
sb.append(Character.toUpperCase(str.charAt(0)));
}
else {
sb.append(Character.toLowerCase(str.charAt(0)));
char baseChar = str.charAt(0);
char updatedChar;
if (capitalize) {
updatedChar = Character.toUpperCase(baseChar);
}
else {
updatedChar = Character.toLowerCase(baseChar);
}
if (baseChar == updatedChar) {
return str;
}
char[] chars = str.toCharArray();
chars[0] = updatedChar;
return new String(chars, 0, chars.length);
}
sb.append(str.substring(1));
return sb.toString();
}
/**