switch (((RepositoryMetadata) metadata).getNature()) {
                case RepositoryMetadata.RELEASE_OR_SNAPSHOT:
                    return Nature.RELEASE_OR_SNAPSHOT;
                case RepositoryMetadata.SNAPSHOT:
                    return Nature.SNAPSHOT;
                default:
                    return Nature.RELEASE;
            }
        } else {
            return Nature.RELEASE;

            throws RepositoryMetadataResolutionException {
        RepositoryMetadata metadata;
        // Don't use snapshot metadata for LATEST (which isSnapshot returns true for)
        if (!artifact.isSnapshot() || Artifact.LATEST_VERSION.equals(artifact.getBaseVersion())) {
            metadata = new ArtifactRepositoryMetadata(artifact);
        } else {

  }

  /** Returns an immutable snapshot of the current statistics. */
  public PairedStats snapshot() {
    return new PairedStats(xStats.snapshot(), yStats.snapshot(), sumOfProductsOfDeltas);
  }

  /** Returns the number of pairs in the dataset. */
  public long count() {
    return xStats.count();
  }

  /** Returns an immutable snapshot of the statistics on the {@code x} values alone. */

import org.eclipse.aether.util.ConfigUtils;

/**
 * Maven local GAV level metadata generator.
 * <p>
 * Local snapshot metadata contains non-transformed snapshot version.
 */
class LocalSnapshotMetadataGenerator implements MetadataGenerator {

    private final Map<Object, LocalSnapshotMetadata> snapshots;

    private final Date timestamp;

 */
public interface Artifact extends Comparable<Artifact> {

    String RELEASE_VERSION = "RELEASE";

    String LATEST_VERSION = "LATEST";

    String SNAPSHOT_VERSION = "SNAPSHOT";

    Pattern VERSION_FILE_PATTERN = Pattern.compile("^(.*)-(\\d{8}\\.\\d{6})-(\\d+)$");

    // TODO into artifactScope handler

    String SCOPE_COMPILE = "compile";

        super(metadata, path, timestamp);
    }

    private static Metadata createMetadata(Artifact artifact) {
        Snapshot snapshot = Snapshot.newBuilder().localCopy(true).build();
        Versioning versioning = Versioning.newBuilder().snapshot(snapshot).build();
        Metadata metadata = Metadata.newBuilder()
                .versioning(versioning)
                .groupId(artifact.getGroupId())

    accumulator.addAll(values);
    return accumulator.snapshot();
  }

  /**
   * Returns statistics over a dataset containing the given values.
   *
   * @param values a series of values
   */
  public static Stats of(double... values) {
    StatsAccumulator accumulator = new StatsAccumulator();
    accumulator.addAll(values);
    return accumulator.snapshot();
  }

  /**

                if (isSnapshot(restriction.getLowerBound()) || isSnapshot(restriction.getUpperBound())) {
                    return RELEASE_OR_SNAPSHOT;
                }
            }
        }

        return RELEASE;
    }

    private boolean isSnapshot(ArtifactVersion version) {
        return version != null && ArtifactUtils.isSnapshot(version.getQualifier());
    }

          case NEW:
            snapshot = new StateSnapshot(TERMINATED);
            enqueueTerminatedEvent(NEW);
            break;
          case STARTING:
            snapshot = new StateSnapshot(STARTING, true, null);
            enqueueStoppingEvent(STARTING);
            doCancelStart();
            break;
          case RUNNING:
            snapshot = new StateSnapshot(STOPPING);

        MavenProject pluginProjectA = createProject("group", "plugin-a", "2.0-SNAPSHOT");
        projects.add(pluginProjectA);
        pluginProjectA.getModel().getBuild().addPlugin(createPlugin("group", "plugin-b", "1.0"));

        MavenProject pluginProjectB = createProject("group", "plugin-b", "2.0-SNAPSHOT");
        projects.add(pluginProjectB);