asoldano commented on a change in pull request #407: [CXF-7716] Reduce
StringBuilders and other performance changes.
URL: https://github.com/apache/cxf/pull/407#discussion_r182964151
##########
File path:
rt/frontend/jaxrs/src/main/java/org/apache/cxf/jaxrs/model/URITemplate.java
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@@ -130,10 +130,31 @@ public String getPatternValue() {
private static String escapeCharacters(String expression) {
- StringBuilder sb = new StringBuilder();
- for (int i = 0; i < expression.length(); i++) {
- char ch = expression.charAt(i);
- sb.append(isReservedCharacter(ch) ? "\\" + ch : ch);
+ int length = expression.length();
Review comment:
This being micro-optimization or not should really be supported by benchmark
result data. If this is on a hot path, creating less StringBuilder can really
make some differences.
This said, please note that the fix actually solves 2 issue:
1) it avoids creating the StringBuilder when not needed
2) it prevents useless StringBuilder instances being created whenever a
reserved character is found, as sb.append(isReservedCharacter(ch) ? "\\" + ch :
ch) internally creates another StringBuilder to perform the "\\" + ch
concatenation.
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