plugin.setArtifactId(pluginInfo.artifactId);
        plugin.setName(pluginInfo.name);
        result.getPlugins().add(plugin);
        return result;
    }

    @Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {

        String key = getKey(artifact.getClassifier(), artifact.getExtension());
        return versions.get(key).getVersion();
    }

    @Override
    protected void merge(Metadata recessive) {
        Snapshot snapshot;
        String lastUpdated;

        if (metadata.getVersioning() == null) {
            DateFormat utcDateFormatter = new SimpleDateFormat(DEFAULT_SNAPSHOT_TIMESTAMP_FORMAT);

                        .artifactId(pluginInfo.artifactId)
                        .name(pluginInfo.name)
                        .build()))
                .build();
    }

    @Override
    protected void merge(Metadata recessive) {
        List<Plugin> recessivePlugins = recessive.getPlugins();
        List<Plugin> plugins = metadata.getPlugins();
        if (!recessivePlugins.isEmpty() || !plugins.isEmpty()) {

        @Override
        public Object compute(Object key, BiFunction<? super Object, ? super Object, ?> remappingFunction) {
            throw uoe();
        }

        @Override
        public Object merge(Object key, Object value, BiFunction<? super Object, ? super Object, ?> remappingFunction) {
            throw uoe();
        }
    }

    private static class Map1<K, V> extends AbstractImmutableMap<K, V> {

    }

    public static Object getKey(Artifact artifact) {
        return artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
    }

    @Override
    protected void merge(Metadata recessive) {
        metadata = metadata.withVersioning(metadata.getVersioning().withLastUpdated(fmt.format(timestamp)));

        String lastUpdated = metadata.getVersioning().getLastUpdated();

     *
     * @param pomRepositories The POM repositories to create the artifact repositories from, must not be {@code null}.
     * @param externalRepositories The external (and already mirrored) repositories to merge into the result list, may
     *            be {@code null}.
     * @param request The project building request holding further settings like repository settings, must not be
     *            {@code null}.

import org.apache.maven.model.building.ModelProblemCollector;
import org.apache.maven.model.merge.MavenModelMerger;

/**
 * Handles normalization of a model.
 *
 */
@Named
@Singleton
public class DefaultModelNormalizer implements ModelNormalizer {

    private DuplicateMerger merger = new DuplicateMerger();

    @Override
    public void mergeDuplicates(

        Settings recessive = Settings.newBuilder()
                .pluginGroups(Arrays.asList("org.codehaus.plexus"))
                .build();

        Settings merged = SettingsUtilsV4.merge(dominant, recessive);

        List<String> pluginGroups = merged.getPluginGroups();

        assertNotNull(pluginGroups);
        assertEquals(3, pluginGroups.size());
        assertEquals("org.apache.maven.plugins", pluginGroups.get(0));

    }

    public static Object getKey(Artifact artifact) {
        return artifact.getGroupId() + ':' + artifact.getArtifactId() + ':' + artifact.getBaseVersion();
    }

    @Override
    protected void merge(Metadata recessive) {
        metadata.getVersioning().setLastUpdatedTimestamp(timestamp);

        String lastUpdated = metadata.getVersioning().getLastUpdated();

                    continue;
                }

                final String item2Id = item2.getId();
                if (item1Id.equals(item2Id)) {
                    mergedItem = SuggestItem.merge(mergedItem, item2);
                    mergedIdSet.add(item1Id);
                }
            }
            mergedList.add(mergedItem);
        }