return classpath == null ? null : classpath.iterator();
    }

    // -------------------------------------------------------------------------------------------
    public ClasspathContainer add(ArtifactMetadata md) {
        if (classpath == null) {
            classpath = new ArrayList<>(16);
        }

        classpath.add(md);

        return this;
    }

@Experimental
@Immutable
public interface ArtifactCoordinates {
    /**
     * {@return the group identifier of the artifact}
     */
    @Nonnull
    String getGroupId();

    /**
     * {@return the identifier of the artifact}
     */
    @Nonnull
    String getArtifactId();

    /**
     * Returns the classifier of the artifact.
     *
     * @return the classifier or an empty string if none, never {@code null}
     */

        return super.read(reader, strict, source);
    }

    @Override
    public Model read(Reader reader, boolean strict) throws IOException, XmlPullParserException {
        return super.read(reader, strict);
    }

    @Override
    public Model read(Reader reader) throws IOException, XmlPullParserException {
        return super.read(reader);
    }

    @Override

            }
        }

        path.append(filename);

        return path.toString();
    }

    public String pathOfRemoteRepositoryMetadata(ArtifactMetadata metadata) {
        return pathOfRepositoryMetadata(metadata, metadata.getRemoteFilename());
    }

    private String formatAsDirectory(String directory) {
        return directory.replace(GROUP_SEPARATOR, PATH_SEPARATOR);
    }

    @Override

   */
  public static <T> Iterable<T> presentInstances(
      final Iterable<? extends Optional<? extends T>> optionals) {
    checkNotNull(optionals);
    return new Iterable<T>() {
      @Override
      public Iterator<T> iterator() {
        return new AbstractIterator<T>() {
          private final Iterator<? extends Optional<? extends T>> iterator =
              checkNotNull(optionals.iterator());

        int t = a + ((b & c) | (~b & d)) + x;
        return t << s | t >>> (32 - s);
    }
    private int GG (int a, int b, int c, int d, int x, int s) {
        int t = a + ((b & (c | d)) | (c & d)) + x + 0x5A827999;
        return t << s | t >>> (32 - s);
    }
    private int HH (int a, int b, int c, int d, int x, int s) {
        int t = a + (b ^ c ^ d) + x + 0x6ED9EBA1;
        return t << s | t >>> (32 - s);
    }

                lookup.lookupOptional(LifecycleMapping.class, id).orElse(null);
        if (lifecycleMapping == null) {
            return Optional.empty();
        }
        Type type = typeRegistry.lookup(id).orElse(null);
        if (type == null) {
            return Optional.empty();
        }
        return Optional.of(new DefaultPackaging(id, type, getPlugins(lifecycleMapping)));
    }

     * Returns the file name extension of the artifact;
     * e.g. "jar", "pom", "xml", etc.
     *
     * @return the file extension
     */
    String getExtension();

    String getDirectory();

    /**
     * Returns the default classifier used if a different one is not set in pom.xml.
     *
     * @return the classifier
     */
    String getClassifier();

    String getPackaging();

            }
        }

        return Collections.emptyList();
    }

    @Override
    public Artifact transformArtifact(Artifact artifact) {
        return artifact;
    }

    @Override
    public Collection<? extends Metadata> finish(Collection<? extends Artifact> artifacts) {
        return snapshots.values();
    }

	if endpoint.IsLocal {
		storage, err := newXLStorage(endpoint, opts.cleanUp)
		if err != nil {
			return nil, err
		}
		return newXLStorageDiskIDCheck(storage, opts.healthCheck), nil
	}

	return newStorageRESTClient(endpoint, opts.healthCheck, globalGrid.Load())