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();
  }

  /**

        metadata.setVersioning(versioning);
        return metadata;
    }

    protected static Versioning createVersioning(Snapshot snapshot) {
        Versioning versioning = new Versioning();
        versioning.setSnapshot(snapshot);
        return versioning;
    }

    @Override
    public void setMetadata(Metadata metadata) {
        this.metadata = metadata;
    }

<metadata modelVersion="1.1.0">
  <groupId>org.codelibs.fess</groupId>
  <artifactId>fess-ds-atlassian</artifactId>
  <version>12.2.0-SNAPSHOT</version>
  <versioning>
    <snapshot>
      <timestamp>20180814.210714</timestamp>
      <buildNumber>10</buildNumber>
    </snapshot>
    <lastUpdated>20180814210714</lastUpdated>
    <snapshotVersions>
      <snapshotVersion>
        <extension>jar</extension>

 * @since 4.0.0
 */
@Experimental
@Consumer
public interface VersionResolver extends Service {

    /**
     * Resolves an artifact's meta version (if any) to a concrete version.
     * For example, resolves "1.0-SNAPSHOT" to "1.0-20090208.132618-23".
     *
     * @param session The repository session, must not be {@code null}.

  }

  /** 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. */

        assertTrue(range.containsVersion(new DefaultArtifactVersion("1.1-SNAPSHOT")));
        assertTrue(range.containsVersion(new DefaultArtifactVersion("1.2-SNAPSHOT")));

        range = VersionRange.createFromVersionSpec("[1.0-SNAPSHOT,1.2]");

        assertTrue(range.containsVersion(new DefaultArtifactVersion("1.0-SNAPSHOT")));

    oneValueAccumulator = new PairedStatsAccumulator();
    oneValueAccumulator.add(ONE_VALUE, OTHER_ONE_VALUE);

    oneValueAccumulatorByAddAllEmptyPairedStats = new PairedStatsAccumulator();
    oneValueAccumulatorByAddAllEmptyPairedStats.add(ONE_VALUE, OTHER_ONE_VALUE);
    oneValueAccumulatorByAddAllEmptyPairedStats.addAll(emptyAccumulator.snapshot());

                    throws Exception {
        Artifact i = createRemoteArtifact("i", "1.0-SNAPSHOT");
        deleteLocalArtifact(i);

        Artifact j = createRemoteArtifact("j", "1.0-SNAPSHOT");
        deleteLocalArtifact(j);

        ArtifactResolutionResult result = artifactResolver.resolveTransitively(

    synchronized (lock) {
      list.clear();
    }
  }

  /** Returns a snapshot of the logged records. */
  /*
   * TODO(cpovirk): consider higher-level APIs here (say, assertNoRecordsLogged(),
   * getOnlyRecordLogged(), getAndClearLogRecords()...)
   *
   * TODO(cpovirk): consider renaming this method to reflect that it takes a snapshot (and/or return
   * an ImmutableList)
   */
  public List<LogRecord> getStoredLogRecords() {

    }

    /**
     * Gets the actual version string for a SNAPSHOT artifact by parsing the snapshot metadata.
     *
     * @param builder the document builder to use for parsing XML
     * @param pluginUrl the URL of the plugin
     * @param version the snapshot version
     * @return the actual version string with timestamp and build number, or null if not found