return missingArtifacts != null && !missingArtifacts.isEmpty();
    }

    public List<Artifact> getMissingArtifacts() {
        return missingArtifacts == null ? Collections.emptyList() : Collections.unmodifiableList(missingArtifacts);
    }

    public ArtifactResolutionResult addMissingArtifact(Artifact artifact) {
        missingArtifacts = initList(missingArtifacts);

        missingArtifacts.add(artifact);

        return missingArtifacts != null && !missingArtifacts.isEmpty();
    }

    public List<Artifact> getMissingArtifacts() {
        return missingArtifacts == null ? Collections.emptyList() : Collections.unmodifiableList(missingArtifacts);
    }

    public MetadataResolutionResult addMissingArtifact(Artifact artifact) {
        missingArtifacts = initList(missingArtifacts);

        missingArtifacts.add(artifact);

  private final List<E> delegate;
  @Nullable E forSerialization;

  RegularImmutableList(List<E> delegate) {
    // TODO(cpovirk): avoid redundant unmodifiableList wrapping
    this.delegate = unmodifiableList(delegate);
  }

  @Override
  List<E> delegateList() {
    return delegate;
  }

 *
 * <p>For example, to test {@link java.util.Collections#unmodifiableList(java.util.List)
 * Collections.unmodifiableList}'s iterator:
 *
 * <pre>{@code
 * List<String> expectedElements =
 *     Arrays.asList("a", "b", "c", "d", "e");
 * List<String> actualElements =
 *     Collections.unmodifiableList(
 *         Arrays.asList("a", "b", "c", "d", "e"));
 * IteratorTester<String> iteratorTester =

 *
 * <p>For example, to test {@link java.util.Collections#unmodifiableList(java.util.List)
 * Collections.unmodifiableList}'s iterator:
 *
 * <pre>{@code
 * List<String> expectedElements =
 *     Arrays.asList("a", "b", "c", "d", "e");
 * List<String> actualElements =
 *     Collections.unmodifiableList(
 *         Arrays.asList("a", "b", "c", "d", "e"));
 * IteratorTester<String> iteratorTester =

 * the License.
 */

package com.google.common.util.concurrent;

import static com.google.common.collect.Lists.newArrayListWithCapacity;
import static java.util.Collections.unmodifiableList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.collect.ImmutableCollection;
import com.google.common.collect.Lists;
import com.google.errorprone.annotations.concurrent.LazyInit;

        return pluginGroups;
    }

    public DefaultPluginPrefixRequest setPluginGroups(List<String> pluginGroups) {
        if (pluginGroups != null) {
            this.pluginGroups = Collections.unmodifiableList(pluginGroups);
        } else {
            this.pluginGroups = Collections.emptyList();
        }

        return this;
    }

    public Model getPom() {
        return pom;
    }

        if (project.getRemoteArtifactRepositories() != null) {
            setRemoteArtifactRepositories(Collections.unmodifiableList(project.getRemoteArtifactRepositories()));
        }

        if (project.getPluginArtifactRepositories() != null) {
            setPluginArtifactRepositories(Collections.unmodifiableList(project.getPluginArtifactRepositories()));
        }

        if (project.getActiveProfiles() != null) {

        List<Node> children =
                getChildren().stream().filter(filter).map(n -> n.filter(filter)).collect(Collectors.toList());
        return new WrapperNode(this, Collections.unmodifiableList(children));
    }

    @Override
    public String asString() {
        StringBuilder sb = new StringBuilder();

        DependencyNode node = getDependencyNode();

        return Collections.unmodifiableList(new MappedList<>(
                ((DefaultProject) project).getProject().getRemoteProjectRepositories(), session::getRemoteRepository));
    }

    @Override
    public List<RemoteRepository> getRemotePluginRepositories(Project project) {
        return Collections.unmodifiableList(new MappedList<>(