Use String::indexOf(char) intrinsic to speedup decode URI fast-path

src/main/java/io/vertx/core/net/impl/URIDecoder.java

@@ -39,6 +39,16 @@ public static String decodeURIComponent(String s) {
  return decodeURIComponent(s, true);
  }
 
+ private static int indexOfPercentOrPlus(String s) {
+ for (int i = 0, size = s.length(); i < size; i++) {
+ final char c = s.charAt(i);
+ if (c == '%' || c == '+') {
+ return i;
+ }
+ }
+ return -1;
+ }
+
  /**
  * Decodes a segment of an URI encoded by a browser.
  *
@@ -55,23 +65,18 @@ public static String decodeURIComponent(String s, boolean plus) {
  if (s == null) {
  return null;
  }
-
- final int size = s.length();
- boolean modified = false;
- int i;
- for (i = 0; i < size; i++) {
- final char c = s.charAt(i);
- if (c == '%' || (plus && c == '+')) {
- modified = true;
- break;
- }
- }
- if (!modified) {
+ int i = !plus ? s.indexOf('%') : indexOfPercentOrPlus(s);
+ if (i == -1) {
  return s;
  }
+ // pack the slowest path away
+ return decodeAndTransformURIComponent(s, i, plus);
+ }
+
+ private static String decodeAndTransformURIComponent(String s, int i, boolean plus) {
  final byte[] buf = s.getBytes(StandardCharsets.UTF_8);
  int pos = i; // position in `buf'.
- for (; i < size; i++) {
+ for (int size = s.length(); i < size; i++) {
  char c = s.charAt(i);
  if (c == '%') {
  if (i == size - 1) {