* @return map of attribute names to values, never {@code null}
     */
    @Nonnull
    Map<String, String> attributes();

    /**
     * Returns the value of a specific attribute.
     *
     * @param name the name of the attribute to retrieve
     * @return the attribute value, or {@code null} if the attribute doesn't exist
     * @throws NullPointerException if name is null
     */
    @Nullable

     * @param key       The key associated with the extractor. Must not be null or blank.
     * @param extractor The extractor to add. Must not be null.
     */
    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.");

        DialectVersion selected = null;
        for (final DialectVersion dv : DialectVersion.values()) {
            if (!dv.isSMB2()) {
                continue;
            }
            if (dv.getDialect() == getDialectRevision()) {
                selected = dv;
            }
        }

        if (selected == null) {
            log.debug("Server returned an unknown dialect");

        // Test with null value
        ComponentUtil.setFessConfig(new FessConfig.SimpleImpl() {
            private static final long serialVersionUID = 1L;

            @Override
            public String getApiJsonResponseExceptionIncluded() {
                return null;
            }
        });

        assertThat(ClassUtil.concatName("aaa", null), is("aaa"));
        assertThat(ClassUtil.concatName("aaa", ""), is("aaa"));
        assertThat(ClassUtil.concatName(null, "bbb"), is("bbb"));
        assertThat(ClassUtil.concatName("", "bbb"), is("bbb"));
        assertThat(ClassUtil.concatName("", "bbb"), is("bbb"));
        assertThat(ClassUtil.concatName(null, null), is(nullValue()));

     * Not all sources are backed by files - for example, in-memory sources
     * or database-backed sources will return null.
     *
     * @return the underlying {@code Path} if this source is file-backed,
     *         or {@code null} if this source has no associated file
     */
    @Nullable
    Path getPath();

    /**
     * Creates a new input stream to read the source contents.

    Collection<Entry<K, V>> entries = getSampleEntries(getNumEntries() - 1);
    entries.add(entry(null, v3()));

    resetContainer(getSubjectGenerator().create(entries.toArray()));
    assertTrue(
        "A Map should equal any other Map containing the same entries,"
            + " even if some keys are null.",
        getMap().equals(newHashMap(entries)));
  }

  @CollectionSize.Require(absent = CollectionSize.ZERO)

      InterruptibleTask<?> localTask = task;
      if (localTask != null) {
        localTask.interruptTask();
      }
    }

    this.task = null;
  }

  @Override
  protected @Nullable String pendingToString() {
    InterruptibleTask<?> localTask = task;
    if (localTask != null) {
      return "task=[" + localTask + "]";
    }
    return super.pendingToString();
  }

  @WeakOuter

        // Mock the behavior of sendrecv for MsrpcSamrOpenAlias
        doAnswer(invocation -> {
            MsrpcSamrOpenAlias rpc = invocation.getArgument(0);
            rpc.retval = 0; // Simulate success
            return null;
        }).when(mockDcerpcHandle).sendrecv(any(MsrpcSamrOpenAlias.class));

        // Act
        SamrAliasHandle aliasHandle = new SamrAliasHandle(mockDcerpcHandle, mockSamrDomainHandle, access, rid);

        // Assert

        @Test
        @DisplayName("Constructor accepts null challenge")
        void testConstructorAcceptsNullChallenge() {
            UniAddress dc = mock(UniAddress.class);

            NtlmChallenge nc = new NtlmChallenge(null, dc);

            assertNull(nc.challenge);
            assertSame(dc, nc.dc);
        }

        @Test
        @DisplayName("Constructor accepts null dc")
        void testConstructorAcceptsNullDc() {