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Reduce allocations and batch appends on StringUtil::replaceNonAlphanumericByUnderscores #1133

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Reduce allocations and batch appends on StringUtil::replaceNonAlphanumericByUnderscores #1133

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26 changes: 21 additions & 5 deletions common/src/main/java/io/smallrye/config/common/utils/StringUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -94,21 +94,37 @@ public static boolean isAsciiLetterOrDigit(char c) {
}

public static String replaceNonAlphanumericByUnderscores(final String name) {
return replaceNonAlphanumericByUnderscores(name, new StringBuilder(name.length()));
return replaceNonAlphanumericByUnderscores(name, null);
}

public static String replaceNonAlphanumericByUnderscores(final String name, final StringBuilder sb) {
public static String replaceNonAlphanumericByUnderscores(final String name, StringBuilder sb) {
int length = name.length();
int copyIndex = -1;
for (int i = 0; i < length; i++) {
char c = name.charAt(i);
if (isAsciiLetterOrDigit(c)) {
sb.append(c);
} else {
if (!isAsciiLetterOrDigit(c)) {
if (sb == null) {
sb = new StringBuilder(name.length());
}
if (copyIndex != -1) {
sb.append(name, copyIndex, i);
copyIndex = -1;
}
sb.append('_');
if (c == '"' && i + 1 == length) {
sb.append('_');
}
} else {
if (copyIndex == -1) {
copyIndex = i;
}
}
}
if (copyIndex != -1) {
if (sb == null) {
return name;
}
sb.append(name, copyIndex, length);
}
return sb.toString();
}
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