import static java.util.Objects.requireNonNull;

@Named
@Singleton
public class DefaultModelVersionParser implements ModelVersionParser {
    private static final String SNAPSHOT = "SNAPSHOT";
    private static final Pattern SNAPSHOT_TIMESTAMP = Pattern.compile("^(.*-)?([0-9]{8}\\.[0-9]{6}-[0-9]+)$");
    private final VersionScheme versionScheme;

    @Inject
    public DefaultModelVersionParser(VersionScheme versionScheme) {

import java.util.Date;

import org.apache.maven.api.metadata.Metadata;
import org.eclipse.aether.artifact.Artifact;

/**
 */
abstract class MavenSnapshotMetadata extends MavenMetadata {
    static final String SNAPSHOT = "SNAPSHOT";

    protected final Collection<Artifact> artifacts = new ArrayList<>();

    protected MavenSnapshotMetadata(Metadata metadata, Path path, Date timestamp) {
        super(metadata, path, timestamp);
    }

        metadata.setVersioning(versioning);
        return metadata;
    }

    protected static Versioning createVersioning(Snapshot snapshot) {
        Versioning versioning = new Versioning();
        versioning.setSnapshot(snapshot);
        return versioning;
    }

    public void setMetadata(Metadata metadata) {
        this.metadata = metadata;
    }

        checkVersionsOrder("1.0-alpha-1", "1.0-alpha-2");
        checkVersionsOrder("1.0-alpha-1", "1.0-beta-1");

        checkVersionsOrder("1.0-beta-1", "1.0-SNAPSHOT");
        checkVersionsOrder("1.0-SNAPSHOT", "1.0");
        checkVersionsOrder("1.0-alpha-1-SNAPSHOT", "1.0-alpha-1");

        checkVersionsOrder("1.0", "1.0-1");
        checkVersionsOrder("1.0-1", "1.0-2");
        checkVersionsOrder("1.0.0", "1.0-1");

            if (artifact.isSnapshot()) {
                Matcher matcher = Artifact.VERSION_FILE_PATTERN.matcher(artifact.getVersion());
                if (matcher.matches()) {
                    Snapshot snapshot = new Snapshot();
                    snapshot.setTimestamp(matcher.group(2));
                    try {
                        snapshot.setBuildNumber(Integer.parseInt(matcher.group(3)));

                            if (version.endsWith("SNAPSHOT")) {
                                final String snapshotVersion = getSnapshotActualVersion(builder, pluginUrl, version);
                                if (StringUtil.isNotBlank(snapshotVersion)) {
                                    final String actualVersion = version.replace("SNAPSHOT", snapshotVersion);

/**
 * Maven remote GAV level metadata generator.
 * <p>
 * Remote snapshot metadata converts artifact on-the-fly to use timestamped snapshot version, and enlist it accordingly.
 */
class RemoteSnapshotMetadataGenerator implements MetadataGenerator {

    private final Map<Object, RemoteSnapshotMetadata> snapshots;

    private final Date timestamp;

    private final Integer buildNumber;

     */
    @Nonnull
    String getExtension();

    /**
     * Determines whether this artifact uses a snapshot version.
     *
     * @return {@code true} if the artifact is a snapshot, {@code false} otherwise
     * @see org.apache.maven.api.Session#isVersionSnapshot(String)
     */
    boolean isSnapshot();

    /**
     * Shortcut for {@code session.createArtifactCoordinate(artifact)}
     *

                    throws Exception {
        Artifact i = createRemoteArtifact("i", "1.0-SNAPSHOT");
        deleteLocalArtifact(i);

        Artifact j = createRemoteArtifact("j", "1.0-SNAPSHOT");
        deleteLocalArtifact(j);

        ArtifactResolutionResult result = artifactResolver.resolveTransitively(

        Snapshot snapshot;
        String lastUpdated;

        if (metadata.getVersioning() == null) {
            DateFormat utcDateFormatter = new SimpleDateFormat(DEFAULT_SNAPSHOT_TIMESTAMP_FORMAT);
            utcDateFormatter.setCalendar(new GregorianCalendar());
            utcDateFormatter.setTimeZone(DEFAULT_SNAPSHOT_TIME_ZONE);

            snapshot = Snapshot.newBuilder()