/**
     * System scope.
     */
    SYSTEM("system", false);

    private static final Map<String, DependencyScope> IDS = Collections.unmodifiableMap(
            Stream.of(DependencyScope.values()).collect(Collectors.toMap(s -> s.id, s -> s)));

    /**
     * {@return the dependency scope for the given identifier, or {@code null} if none}.
     * The identifiers are usually in lower cases with {@code '-'} instead of {@code '_'}

    return values
        .collect(StatsAccumulator::new, StatsAccumulator::add, StatsAccumulator::addAll)
        .snapshot();
  }

  /**
   * Returns a {@link Collector} which accumulates statistics from a {@link java.util.stream.Stream}
   * of any type of boxed {@link Number} into a {@link Stats}. Use by calling {@code

            result.addAll(Arrays.stream(pluginHelper.getAvailableArtifacts(artifactType))
                    .map(AdminPluginAction::beanToMap)
                    .collect(Collectors.toList()));
        }
        return result;
    }

    /**
     * Retrieves all installed artifacts from all plugin types.
     *

                        && !rootProject.getDefaultGoal().isEmpty())) {
            tasks = Stream.of(rootProject.getDefaultGoal().split("\\s+"))
                    .filter(g -> !g.isEmpty())
                    .collect(Collectors.toList());
        }

        return calculateTaskSegments(session, tasks);
    }

    @Override
    public List<TaskSegment> calculateTaskSegments(MavenSession session, List<String> tasks)

    public ExclusionArtifactFilter(List<Exclusion> exclusions) {
        this.exclusions = exclusions;
        this.predicates =
                exclusions.stream().map(ExclusionArtifactFilter::toPredicate).collect(Collectors.toList());
    }

    @Override
    public boolean include(Artifact artifact) {
        return predicates.stream().noneMatch(p -> p.test(artifact));
    }

                    msg += ". Path to offending node from root:\n";
                    msg += stepData.getPath().stream()
                            .map(n -> " -> " + n.toString())
                            .collect(Collectors.joining("\n"));
                    msg += "\n => " + stepData.getNode();
                }
                return msg;
            } else if (data instanceof ArtifactDescriptorRequest request) {

import com.google.common.collect.testing.ListTestSuiteBuilder;
import com.google.common.collect.testing.NavigableSetTestSuiteBuilder;
import com.google.common.collect.testing.features.CollectionFeature;
import com.google.common.collect.testing.features.CollectionSize;
import com.google.common.collect.testing.google.SetGenerators.ImmutableSortedSetAsListGenerator;

import static com.google.common.cache.LocalCache.Strength.STRONG;
import static com.google.common.collect.Maps.immutableEntry;
import static com.google.common.truth.Truth.assertThat;

import com.google.common.base.Function;
import com.google.common.cache.LocalCache.Strength;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import java.lang.ref.WeakReference;
import junit.framework.TestCase;

      CollectorTester<T, A, R> of(
          Collector<T, A, R> collector, BiPredicate<? super R, ? super R> equivalence) {
    return new CollectorTester<>(collector, equivalence);
  }

  private final Collector<T, A, R> collector;
  private final BiPredicate<? super R, ? super R> equivalence;

  private CollectorTester(
      Collector<T, A, R> collector, BiPredicate<? super R, ? super R> equivalence) {

                .filter(p -> !request.getPluginGroups().contains(p.getGroupId()))
                .collect(Collectors.groupingBy(
                        Plugin::getGroupId,
                        LinkedHashMap::new,
                        Collectors.mapping(Plugin::getArtifactId, Collectors.toSet())));
        request.getPluginGroups().forEach(g -> candidates.put(g, null));