}

    private static SnapshotVersion addSnapshotVersion(
            Versioning versioning, String extension, Date timestamp, String version, int buildNumber) {
        Snapshot snapshot = new Snapshot();
        snapshot.setBuildNumber(buildNumber);
        snapshot.setTimestamp(formatDate(timestamp, true));

        SnapshotVersion sv = new SnapshotVersion();
        sv.setExtension(extension);

                    {
                        java.util.Map<String, SnapshotVersion> versions = new java.util.LinkedHashMap<>();
                        // never convert from legacy to new format if either source or target is legacy format
                        if ( !v.getSnapshotVersions().isEmpty() )
                        {
                            for ( SnapshotVersion sv : versioning.getSnapshotVersions() )
                            {

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

import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Objects;

import org.apache.maven.artifact.repository.metadata.Snapshot;
import org.apache.maven.artifact.repository.metadata.SnapshotVersion;
import org.apache.maven.artifact.repository.metadata.Versioning;
import org.apache.maven.metadata.v4.MetadataStaxReader;
import org.eclipse.aether.RepositoryCache;
import org.eclipse.aether.RepositoryEvent;