if (dominant == null || recessive == null) {
            return;
        }

        recessive.setSourceLevel(recessiveSourceLevel);

        dominant.update(new org.apache.maven.toolchain.v4.MavenToolchainsMerger()
                .merge(dominant.getDelegate(), recessive.getDelegate(), true, null));
    }

 *
 * <p>A converter always converts {@code null} to {@code null} and non-null references to non-null
 * references. It would not make sense to consider {@code null} and a non-null reference to be
 * "different representations of the same information", since one is distinguishable from
 * <i>missing</i> information and the other is not. The {@link #convert} method handles this null

    assertFalse(entries.contains(Maps.<String, @Nullable Boolean>immutableEntry("c", null)));
    assertFalse(entries.contains(Maps.<@Nullable String, Boolean>immutableEntry(null, true)));
  }

  @Override
  public void testKeySetRemoveAllNullFromEmpty() {
    try {
      super.testKeySetRemoveAllNullFromEmpty();
    } catch (RuntimeException tolerated) {

            if (delegate.getRange() == null) {
                return null;
            }
            return new DefaultVersionRange(versionScheme, delegate.getRange());
        }

        @Override
        public Version getRecommendedVersion() {
            if (delegate.getVersion() == null) {
                return null;
            }

        if (StringUtil.isBlank(requestPath)) {
            return null;
        }
        final String virtualHostKey = ComponentUtil.getVirtualHostHelper().getVirtualHostKey();
        if (StringUtil.isBlank(virtualHostKey)) {
            return null;
        }
        final String prefix = "/" + virtualHostKey;
        if (requestPath.startsWith(prefix)) {

     * Determines the mirror for the specified repository.
     *
     * @param repository The repository to determine the mirror for, must not be {@code null}.
     * @param mirrors The available mirrors, may be {@code null}.
     * @return The mirror specification for the repository or {@code null} if no mirror matched.
     */
    Mirror getMirror(ArtifactRepository repository, List<Mirror> mirrors);

     *
     * @return The model identifiers from the lineage of models, never {@code null}.
     */
    List<String> getModelIds();

    /**
     *
     * @return the file model
     * @since 4.0.0
     */
    Model getFileModel();

    /**
     * Gets the assembled model.
     *
     * @return The assembled model, never {@code null}.
     */
    Model getEffectiveModel();

    /**

        return toShort(o, null);
    }

    /**
     * {@link Short}に変換します。
     *
     * @param o
     *            変換元のオブジェクト
     * @param pattern
     *            パターン文字列
     * @return 変換された{@link Short}
     */
    public static Short toShort(final Object o, final String pattern) {
        if (o == null) {
            return null;
        } else if (o instanceof Short) {

     *
     * @param file The file, must not be {@code null}.
     * @deprecated Use {@link #FileSource(Path)} instead.
     */
    @Deprecated
    public FileSource(File file) {
        this(Objects.requireNonNull(file, "file cannot be null").toPath());
    }

    /**
     * Creates a new source backed by the specified file.
     *
     * @param path The file, must not be {@code null}.
     * @since 4.0.0
     */

  }

  public static ByteSourceFactory fileByteSourceFactory() {
    return new FileByteSourceFactory();
  }

  public static ByteSinkFactory fileByteSinkFactory() {
    return new FileByteSinkFactory(null);
  }

  public static ByteSinkFactory appendingFileByteSinkFactory() {
    String initialString = IoTestCase.ASCII + IoTestCase.I18N;
    return new FileByteSinkFactory(initialString.getBytes(UTF_8));
  }