@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@Fork(jvmArgsAppend = {"-Xms2g", "-Xmx2g"})
public class DropDoubleSlashBenchmark {

  @Benchmark
  public String ineffective(Data data) {
    String path = data.path;
    while (true) {
      int index = path.indexOf("//");
      if (index == -1) {
        break;
      }
      path = path.substring(0, index) + path.substring(index + 1);
    }
    return path;
  }

  @Benchmark
  public String effective(Data data) {
    StringBuilder path = new StringBuilder(data.path);
    while (true) {
      int index = path.indexOf("//");
      if (index == -1) {
        break;
      }
      path.deleteCharAt(index);
    }
    return path.toString();
  }

  @State(Scope.Thread)
  public static class Data {
    private final String path = "/home/" + "/path";
  }
}