}

  @Override
  public EndpointPair<N> incidentNodes(E edge) {
    N nodeU = checkedReferenceNode(edge);
    // requireNonNull is safe because checkedReferenceNode made sure the edge is in the network.
    N nodeV = requireNonNull(nodeConnections.get(nodeU)).adjacentNode(edge);
    return EndpointPair.of(this, nodeU, nodeV);
  }

  @Override
  public Set<N> adjacentNodes(N node) {

  private static <N, V> GraphConnections<N, V> connectionsOf(ValueGraph<N, V> graph, N node) {
    Function<N, V> successorNodeToValueFn =
        (N successorNode) ->
            // requireNonNull is safe because the endpoint pair comes from the graph.
            requireNonNull(graph.edgeValueOrDefault(node, successorNode, null));
    return graph.isDirected()
        ? DirectedGraphConnections.ofImmutable(

   */
  final void init() {
    /*
     * requireNonNull is safe because this is called from the constructor after `futures` is set but
     * before releaseResources could be called (because we have not yet set up any of the listeners
     * that could call it, nor exposed this Future for users to call cancel() on).
     */
    requireNonNull(futures);

    // Corner case: List is empty.

            RepositoryEventDispatcher repositoryEventDispatcher) {
        this.metadataResolver = Objects.requireNonNull(metadataResolver, "metadataResolver cannot be null");
        this.syncContextFactory = Objects.requireNonNull(syncContextFactory, "syncContextFactory cannot be null");
        this.repositoryEventDispatcher =
                Objects.requireNonNull(repositoryEventDispatcher, "repositoryEventDispatcher cannot be null");
    }

        return new ArrayList<>(sorter.getSortedProjects());
    }

    public List<MavenProject> getDownstreamProjects(MavenProject project, boolean transitive) {
        Objects.requireNonNull(project, "project cannot be null");

        Set<String> projectIds = new HashSet<>();

        getDownstreamProjects(ProjectSorter.getId(project), projectIds, transitive);

import java.util.function.Supplier;

import org.apache.maven.api.plugin.Log;
import org.slf4j.Logger;

import static java.util.Objects.requireNonNull;

public class DefaultLog implements Log {
    private final Logger logger;

    public DefaultLog(Logger logger) {
        this.logger = requireNonNull(logger);
    }

    public void debug(CharSequence content) {
        if (isDebugEnabled()) {

      /*
       * The following requireNonNull calls are safe because we use jlaStackTrace() only if
       * lazyStackTraceIsLazy() returns true.
       */
      @Override
      public StackTraceElement get(int n) {
        return (StackTraceElement)
            invokeAccessibleNonThrowingMethod(
                requireNonNull(getStackTraceElementMethod), requireNonNull(jla), t, n);
      }

      @Override

   * CompactHashMap.
   */

  private int[] requirePredecessors() {
    return requireNonNull(predecessor);
  }

  private int[] requireSuccessors() {
    return requireNonNull(successor);
  }

  /*
   * We don't define getPredecessor+getSuccessor and setPredecessor+setSuccessor here because

        (n == entryArray.length) ? (Entry<K, V>[]) entryArray : createEntryArray(n);
    int hashCode = 0;

    for (int i = 0; i < n; i++) {
      // requireNonNull is safe because the first `n` elements have been filled in.
      Entry<K, V> entry = requireNonNull(entryArray[i]);
      K key = entry.getKey();
      V value = entry.getValue();
      checkEntryNotNull(key, value);
      int keyHash = key.hashCode();

        this(new CoreExports(CoreExtensionEntry.discoverFrom(coreRealm.getRealm())));
    }

    public CoreExportsProvider(CoreExports exports) {
        this.exports = Objects.requireNonNull(exports);
    }

    public CoreExports get() {
        return exports;
    }