}
    return sum;
  }

  /**
   * Resets variables maintaining the sum to zero. This method may be a useful alternative to
   * creating a new adder, but is only effective if there are no concurrent updates. Because this
   * method is intrinsically racy, it should only be used when it is known that no threads are
   * concurrently updating.
   */
  public void reset() {
    internalReset(0L);
  }

  /**

 * URI, the domain name case is further restricted to include only those domain names which end in a
 * recognized public suffix; see {@link InternetDomainName#isPublicSuffix()} for details.
 *
 * <p>Note that no network lookups are performed by any {@code HostSpecifier} methods. No attempt is
 * made to verify that a provided specifier corresponds to a real or accessible host. Only syntactic
 * and pattern-based checks are performed.
 *

 * multi-level dependency graph to a map of ordered lists that can be turned into classpaths.
 * During this process only the most relevant version of each artifact
 * (based on group ID and artifact ID) is retained, resolving conflicts and eliminating duplicates to ensure
 * that each dependency is included only once in the final build.</p>
 *

          !shutdownWhenStartupFinishes || internalState == STARTING,
          "shutdownWhenStartupFinishes can only be set if state is STARTING. Got %s instead.",
          internalState);
      checkArgument(
          (failure != null) == (internalState == FAILED),
          "A failure cause should be set if and only if the state is failed.  Got %s and %s "
              + "instead.",
          internalState,
          failure);

  final N node;
  final ArchetypeGraph<N> graph;
  final EdgeType edgeType;

  enum EdgeType {
    INCOMING, // incoming incident edges only
    OUTGOING, // outgoing incident edges only
    BOTH // both incoming and outgoing incident edges
  }

  IncidentEdgeSet(ArchetypeGraph<N> graph, N node, EdgeType edgeType) {
    this.graph = graph;
    this.node = node;

            throws ArtifactMetadataRetrievalException;

    /**
     * Get a list of available versions for an artifact in the remote repository
     *
     * @param artifact           artifact we are interested in. Only <code>groupid</code> and <code>artifactId</code>
     *                           are needed, for instance the following code will work

      or other liability obligations and/or rights consistent with this
      License. However, in accepting such obligations, You may act only
      on Your own behalf and on Your sole responsibility, not on behalf
      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason

      or other liability obligations and/or rights consistent with this
      License. However, in accepting such obligations, You may act only
      on Your own behalf and on Your sole responsibility, not on behalf
      of any other Contributor, and only if You agree to indemnify,
      defend, and hold each Contributor harmless for any liability
      incurred by, or claims asserted against, such Contributor by reason

                    Arguments.of("", "empty version"),
                    Arguments.of("   ", "whitespace-only version"),
                    Arguments.of("4", "incomplete version (major only)"),
                    Arguments.of("4.0", "incomplete version (major.minor only)"),
                    Arguments.of("invalid", "non-numeric version"),
                    Arguments.of("4.0.0-SNAPSHOT", "snapshot version"),

  that is, if they require configuration of a server process, and
  subsequent testing in-container.

  Since we're only going to concern ourselves with states where localhost is
  still active, we only need to worry about this case when the server container
  is <<not>> installed on localhost. This allows the popular pattern of starting