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Improve performance of StringUtils.capitalize()

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Issue: SPR-15094
This commit is contained in:
Christoph Dreis
2017-01-04 19:13:06 +01:00
parent 0e20360bf9
commit 83929b2b98
1 changed files with 14 additions and 7 deletions
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21
spring-core/src/main/java/org/springframework/util/StringUtils.java
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@@ -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();
}
/**