public static int indexOfIgnoreCase()

in common/src/main/java/co/elastic/otel/common/config/WildcardMatcher.java [175:221]

• 40 lines of code
• 12 McCabe index (conditional complexity)

  public static int indexOfIgnoreCase(
      final CharSequence haystack1,
      final CharSequence haystack2,
      final String needle,
      final boolean ignoreCase,
      final int start,
      final int end) {
    if (start < 0) {
      return -1;
    }
    int totalHaystackLength = haystack1.length() + haystack2.length();
    if (needle.isEmpty() || totalHaystackLength == 0) {
      // Fallback to legacy behavior.
      return indexOf(haystack1, needle);
    }

    final int haystack1Length = haystack1.length();
    final int needleLength = needle.length();
    for (int i = start; i < end; i++) {
      // Early out, if possible.
      if (i + needleLength > totalHaystackLength) {
        return -1;
      }

      // Attempt to match substring starting at position i of haystack.
      int j = 0;
      int ii = i;
      while (ii < totalHaystackLength && j < needleLength) {
        char c =
            ignoreCase
                ? Character.toLowerCase(charAt(ii, haystack1, haystack2, haystack1Length))
                : charAt(ii, haystack1, haystack2, haystack1Length);
        char c2 = ignoreCase ? Character.toLowerCase(needle.charAt(j)) : needle.charAt(j);
        if (c != c2) {
          break;
        }
        j++;
        ii++;
      }
      // Walked all the way to the end of the needle, return the start
      // position that this was found.
      if (j == needleLength) {
        return i;
      }
    }
    return -1;
  }