public void addExtractor(final String key, final Extractor extractor) {
        if (StringUtil.isBlank(key)) {
            throw new CrawlerSystemException("The key is null.");
        }
        if (extractor == null) {
            throw new CrawlerSystemException("The extractor is null.");
        }
        if (extractorMap.containsKey(key)) {
            final Extractor oldExtractor = extractorMap.get(key);

    TestCallable secondCallable = new TestCallable(Futures.<Void>immediateFuture(null));
    @SuppressWarnings({"unused", "nullness"})
    Future<?> possiblyIgnoredError1 = serializer.submitAsync(secondCallable, directExecutor());
    assertThat(firstCallable.called).isTrue();
    assertThat(secondCallable.called).isFalse();
    firstFuture.set(null);
    assertThat(secondCallable.called).isTrue();
  }

      @JvmStatic
      fun create(body: RequestBody): Part = create(null, body)

      @JvmStatic
      fun create(
        headers: Headers?,
        body: RequestBody,
      ): Part {
        require(headers?.get("Content-Type") == null) { "Unexpected header: Content-Type" }
        require(headers?.get("Content-Length") == null) { "Unexpected header: Content-Length" }
        return Part(headers, body)
      }

        if (tag.equalsIgnoreCase(node.getNodeName())) {
            if (attrName != null) {
                final Node attr = node.getAttributes().getNamedItem(attrName);
                if (attr == null || !attrValue.equals(attr.getNodeValue())) {
                    return false;
                }
            }
            if (id == null) {
                if (css == null) {
                    return true;
                }

    }

    @Test
    void testVersionParsing() {
        checkVersionParsing("1", 1, 0, 0, 0, null);
        checkVersionParsing("1.2", 1, 2, 0, 0, null);
        checkVersionParsing("1.2.3", 1, 2, 3, 0, null);
        checkVersionParsing("1.2.3-1", 1, 2, 3, 1, null);
        checkVersionParsing("1.2.3-alpha-1", 1, 2, 3, 0, "alpha-1");
        checkVersionParsing("1.2-alpha-1", 1, 2, 0, 0, "alpha-1");

    public Mirror getMirror(ArtifactRepository repository, List<Mirror> mirrors) {
        String repoId = repository.getId();

        if (repoId != null && mirrors != null) {
            for (Mirror mirror : mirrors) {
                if (repoId.equals(mirror.getMirrorOf()) && matchesLayout(repository, mirror)) {
                    return mirror;
                }
            }

    protected final Field userFSTReaderField;

    protected final Field dictionaryMapField;

    private final Environment env;

    private final Settings settings;

    private File reloadableFile = null;

    protected volatile long dictionaryTimestamp;

    private volatile long lastChecked;

    private long reloadInterval;

    private volatile UserDictionary userDictionary;

internal fun Headers.commonValues(name: String): List<String> {
  var result: MutableList<String>? = null
  for (i in 0 until size) {
    if (name.equals(name(i), ignoreCase = true)) {
      if (result == null) result = ArrayList(2)
      result.add(value(i))
    }
  }
  return result?.toList().orEmpty()
}

/**
 * @author shinsuke
 * @author kaorufuzita
 */
public class TextUtilTest extends PlainTestCase {

    public void test_getContent() {
        assertEquals("", normalizeText((String) null, 100, -1, -1, false));
        assertEquals("", normalizeText("", 100, -1, -1, false));
        assertEquals("", normalizeText(" ", 100, -1, -1, false));
        assertEquals("", normalizeText("  ", 100, -1, -1, false));

    builder.interceptors().addAll(listOf(null) as List<Interceptor>)
    assertFailsWith<IllegalStateException> {
      builder.build()
    }.also { expected ->
      assertThat(expected.message).isEqualTo("Null interceptor: [null]")
    }
  }

  @Test fun nullNetworkInterceptorInList() {
    val builder = OkHttpClient.Builder()
    builder.networkInterceptors().addAll(listOf(null) as List<Interceptor>)