import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.io.FileWriteMode.APPEND;
import static java.util.Collections.unmodifiableList;

import com.google.common.annotations.Beta;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Joiner;

        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);

        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);

            final boolean hasRelevantResults) {
        this.relevantDocIds = relevantDocIds != null ? Collections.unmodifiableList(relevantDocIds) : Collections.emptyList();
        this.relevantIndexes = relevantIndexes != null ? Collections.unmodifiableList(relevantIndexes) : Collections.emptyList();
        this.hasRelevantResults = hasRelevantResults;
    }

    /**

     * @deprecated Use {@link #getRequiredActiveProfileIds()} and {@link #getOptionalActiveProfileIds()} instead.
     */
    @Deprecated
    public List<String> getActiveProfiles() {
        return Collections.unmodifiableList(new ArrayList<>(getProfileIds(pa -> pa.active())));
    }

    /**
     * Mimics the pre-Maven 4 "inactive profiles" list.

import static java.util.Arrays.sort;
import static java.util.Collections.emptyList;
import static java.util.Collections.singleton;
import static java.util.Collections.sort;
import static java.util.Collections.unmodifiableList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Function;

import static java.util.Arrays.sort;
import static java.util.Collections.emptyList;
import static java.util.Collections.singleton;
import static java.util.Collections.sort;
import static java.util.Collections.unmodifiableList;

import com.google.common.annotations.GwtCompatible;
import com.google.common.annotations.GwtIncompatible;
import com.google.common.annotations.J2ktIncompatible;
import com.google.common.base.Function;

     */
    private final List<ProjectActivationSettings> activations = new ArrayList<>();

    public List<ProjectActivationSettings> getActivations() {
        return Collections.unmodifiableList(activations);
    }

    /**
     * Adds a project activation to the request.
     * @param selector The selector of the project.
     * @param active Should the project be activated?

    }

    @Override
    public List<MavenProject> getTopologicallySortedProjects() {
        return null == topologicallySortedProjects
                ? Collections.emptyList()
                : Collections.unmodifiableList(topologicallySortedProjects);
    }

    @Override
    public DependencyResolutionResult getDependencyResolutionResult() {
        return dependencyResolutionResult;
    }

    @Override

     */
    public DefaultProfileActivationContext setActiveProfileIds(List<String> activeProfileIds) {
        if (activeProfileIds != null) {
            this.activeProfileIds = Collections.unmodifiableList(activeProfileIds);
        } else {
            this.activeProfileIds = Collections.emptyList();
        }

        return this;
    }

    @Override
    public List<String> getInactiveProfileIds() {