content: package com.alibaba.fastjson2.benchmark;
  
  import com.alibaba.fastjson2.benchmark.eishay.EishayParseStringPretty;
  import org.apache.commons.io.IOUtils;
  import org.openjdk.jmh.annotations.Benchmark;
  import org.openjdk.jmh.annotations.Mode;
  import org.openjdk.jmh.infra.Blackhole;
  import org.openjdk.jmh.runner.Runner;
  import org.openjdk.jmh.runner.options.Options;
  import org.openjdk.jmh.runner.options.OptionsBuilder;
  
  import java.io.InputStream;
  import java.util.concurrent.TimeUnit;
  
  public class SpaceCheckBenchmark {
      static String str;
      static char[] chars;
  
      static final long SPACE = (1L << ' ') | (1L << '\n') | (1L << '\r') | (1L << '\f') | (1L << '\t') | (1L << '\b');
  
      static {
          try {
              InputStream is = EishayParseStringPretty.class.getClassLoader().getResourceAsStream("data/eishay.json");
              str = IOUtils.toString(is, "UTF-8");
              chars = str.toCharArray();
          } catch (Throwable ex) {
              ex.printStackTrace();
          }
      }
  
      @Benchmark
      public void spaceBitAnd(Blackhole bh) {
          int spaceCount = 0;
          for (int i = 0; i < chars.length; i++) {
              char ch = chars[i];
              boolean space = ch <= ' ' && ((1L << ch) & SPACE) != 0;
              if (space) {
                  spaceCount++;
              }
          }
          bh.consume(spaceCount);
      }
  
      @Benchmark
      public void spaceOr(Blackhole bh) {
          int spaceCount = 0;
          for (int i = 0; i < chars.length; i++) {
              char ch = chars[i];
              boolean space = ch == ' '
                      || ch == '\n'
                      || ch == '\r'
                      || ch == '\f'
                      || ch == '\t'
                      || ch == '\b';
              if (space) {
                  spaceCount++;
              }
          }
          bh.consume(spaceCount);
      }
  
      @Benchmark
      public void spaceOrPreCheck(Blackhole bh) {
          int spaceCount = 0;
          for (int i = 0; i < chars.length; i++) {
              char ch = chars[i];
              boolean space = ch <= ' '
                      && (ch == ' '
                          || ch == '\n'
                          || ch == '\r'
                          || ch == '\f'
                          || ch == '\t'
                          || ch == '\b'
              );
              if (space) {
                  spaceCount++;
              }
          }
          bh.consume(spaceCount);
      }
  
      @Benchmark
      public void CharacterIsWhitespace(Blackhole bh) {
          int spaceCount = 0;
          for (int i = 0; i < chars.length; i++) {
              char ch = chars[i];
              boolean space = Character.isWhitespace(ch);
              if (space) {
                  spaceCount++;
              }
          }
          bh.consume(spaceCount);
      }
  
      @Benchmark
      public void spaceSwitch(Blackhole bh) {
          int spaceCount = 0;
          for (int i = 0; i < chars.length; i++) {
              char ch = chars[i];
              boolean space;
              switch (ch) {
                  case ' ':
                  case '\n':
                  case '\r':
                  case '\t':
                  case '\b':
                  case '\f':
                      space = true;
                      break;
                  default:
                      space = false;
                      break;
              }
              if (space) {
                  spaceCount++;
              }
          }
          bh.consume(spaceCount);
      }
  
      public static void main(String[] args) throws Exception {
          Options options = new OptionsBuilder()
                  .include(SpaceCheckBenchmark.class.getName())
                  .mode(Mode.Throughput)
                  .warmupIterations(1)
                  .timeUnit(TimeUnit.MILLISECONDS)
                  .forks(1)
                  .build();
          new Runner(options).run();
      }
  }
  