return null;
        }
    }

    /**
     * Converts a pattern string to a plain pattern string without delimiters.
     *
     * @param pattern the pattern string
     * @return the plain pattern string without delimiters
     */
    protected static String toPlainPattern(final String pattern) {
        final StringBuilder buf = new StringBuilder(pattern.length());
        for (int i = 0; i < pattern.length(); ++i) {

    }

    @Override
    public String toString() {
      return name;
    }
  }

  private static final class EqualsBasedOnToString {
    private final String s;

    private EqualsBasedOnToString(String s) {
      this.s = s;
    }

    @Override
    public boolean equals(@Nullable Object obj) {
      return obj != null && obj.toString().equals(toString());
    }

    @Override

        return null;
    }

    /**
     * Return the a text representation of this address such as
     * <code>MYCOMPUTER/192.168.1.15</code>.
     */
    @Override
    public String toString() {
        return this.addr.toString();
    }

     * @param defaultValue the default value to return if key is not found
     * @return the parameter value as a string, or the default value if not found
     */
    protected String getParamValue(final DataStoreParams paramMap, final String key, final String defaultValue) {
        return paramMap.getAsString(key, defaultValue);
    }

    /**

    @Override
    public String getVersion() {
        return artifact.getBaseVersion();
    }

    @Override
    public File getFile() {
        return artifact.getFile();
    }

    @Override
    public String toString() {
        return artifact.toString();
    }

    }

    public void addField(final String key, final Object value) {
        fields.put(key, value);
    }

    public String getLogMessage() {
        return getUrl();
    }

    public LocalDateTime getRequestedAt() {
        return getCreatedAt();
    }

    @Override
    public Map<String, Object> toSource() {
        final Map<String, Object> sourceMap = super.toSource();

                // Default error class
                Arguments.of(999, 0, "unknown error class: 999"));
    }

    /**
     * Test the toString method to ensure it returns the expected string format.
     */
    @Test
    @DisplayName("toString should return a correctly formatted string")
    void testToString() {
        int errorClass = NbtException.ERR_SSN_SRVC;
        int errorCode = NbtException.CONNECTION_REFUSED;

    List<Optional<String>> optionals =
        ImmutableList.of(Optional.of("a"), Optional.<String>absent(), Optional.of("c"));
    assertThat(Optional.presentInstances(optionals)).containsExactly("a", "c").inOrder();
  }

  public void testPresentInstances_callingIteratorTwice() {
    List<Optional<String>> optionals =
        ImmutableList.of(Optional.of("a"), Optional.<String>absent(), Optional.of("c"));

@Deprecated(since = "4.0.0")
public class ArtifactModelSource extends FileSource implements ModelSource {
    private final String groupId;

    private final String artifactId;

    private final String version;

    private final int hashCode;

    @Deprecated
    public ArtifactModelSource(File file, String groupId, String artifactId, String version) {
        super(file);
        this.groupId = groupId;
        this.artifactId = artifactId;

   *
   * @param url the URL to read from
   * @param charset the charset used to decode the input stream; see {@link StandardCharsets} for
   *     helpful predefined constants
   * @return a string containing all the characters from the URL
   * @throws IOException if an I/O error occurs.
   */