if (!matcher.matches()) {
            return null;
        }

        String className = null;
        if (matcher.group(1).length() > 0) {
            className = typeNameResolver.resolve(matcher.group(1), classMetaData);
            if (className == null) {
                return null;
            }
        }
        if (matcher.group(2) == null) {

  /** The low-level TCP socket. */
  private var rawSocket: JavaNetSocket? = null

  /**
   * The application layer socket. Either an [SSLSocket] layered over [rawSocket], or [rawSocket]
   * itself if this connection does not use SSL.
   */
  internal var javaNetSocket: JavaNetSocket? = null
  private var handshake: Handshake? = null
  private var protocol: Protocol? = null
  private lateinit var socket: BufferedSocket

        PlexusConfiguration[] ces = c.getChildren();
        if (ces != null) {
            for (PlexusConfiguration ce : ces) {
                String value = ce.getValue(null);
                String defaultValue = ce.getAttribute("default-value", null);
                if (value != null || defaultValue != null) {
                    XmlNode e = XmlNode.newInstance(
                            ce.getName(),

            // Validate inputs
            if (path == null || path.isEmpty() || docMap == null || docMap.isEmpty()) {
                return null;
            }

            Object mimeType = docMap.get("mimetype");
            if (mimeType == null) {
                return null;
            }

            // Create a task tuple

        Editor editor = new Editor(pomDocument);
        Element root = editor.root();
        if (root == null) {
            return MODEL_VERSION_4_0_0;
        }

        // First try to get from modelVersion element
        Element modelVersionElement = root.child(MODEL_VERSION).orElse(null);
        if (modelVersionElement != null) {
            String modelVersion = modelVersionElement.textContentTrimmed();

            if (labelValueMap != null) {
                return labelValueMap.get(value);
            }
            return null;
        }).orElse(value);
    }

    /**
     * Converts a Long timestamp to a Date object.
     *
     * @param value the timestamp in milliseconds
     * @return Date object representing the timestamp, or null if value is null
     */

     * @param root the Maven Dependency, must not be {@code null}
     * @param scope the {link PathScope} to collect dependencies, must not be {@code null}
     * @return the collection result, never {@code null}
     * @throws DependencyResolverException if the dependency tree could not be built
     * @throws IllegalArgumentException if an argument is null or invalid

      Set<Object> keys = cache.asMap().keySet();
      assertThat(keys.remove(null)).isFalse();
      assertThat(keys.remove(6)).isFalse();
      assertThat(keys.remove(-6)).isFalse();
      assertThat(keys.removeAll(asList(null, 0, 15, 1500))).isFalse();
      assertThat(keys.retainAll(asList(null, 0, 15, 1500))).isFalse();
      checkEmpty(keys);
      checkEmpty(cache);
    }
  }

      int size = (keyList == null) ? 0 : keyList.count;
      checkPositionIndex(index, size);
      if (index >= (size / 2)) {
        previous = (keyList == null) ? null : keyList.tail;
        nextIndex = size;
        while (index++ < size) {
          previous();
        }
      } else {
        next = (keyList == null) ? null : keyList.head;
        while (index-- > 0) {
          next();

        // Test equals with null input - should not throw, uses null-safe comparison
        StopwordsItem item1 = new StopwordsItem(1, null);
        StopwordsItem item2 = new StopwordsItem(2, null);
        StopwordsItem item3 = new StopwordsItem(1, "word");

        // Two items with null input should be equal
        assertTrue(item1.equals(item2));

        // Item with null input should not equal item with non-null input