import java.util.Date;
import java.util.Map;

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.metadata.v4.MetadataStaxReader;
import org.apache.maven.metadata.v4.MetadataStaxWriter;
import org.eclipse.aether.RepositoryException;
import org.eclipse.aether.metadata.AbstractMetadata;
import org.eclipse.aether.metadata.MergeableMetadata;

/**
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead

        super(createRepositoryMetadata(artifact), path, timestamp);
        this.artifact = artifact;
    }

    private static Metadata createRepositoryMetadata(Artifact artifact) {
        Metadata metadata = new Metadata();
        metadata.setGroupId(artifact.getGroupId());
        metadata.setArtifactId(artifact.getArtifactId());

        Versioning versioning = new Versioning();

     */
    Metadata getMetadata();

    /**
     * Set the metadata contents.
     *
     * @param metadata the metadata
     */
    void setMetadata(Metadata metadata);

    /**
     * Whether this represents a snapshot.
     *
     * @return if it is a snapshot
     */
    boolean isSnapshot();

    /**

        String dateBefore = gregorianDate();

        RemoteSnapshotMetadata metadata =
                new RemoteSnapshotMetadata(new DefaultArtifact("a:b:1-SNAPSHOT"), new Date(), null);
        metadata.merge(new Metadata());

        String dateAfter = gregorianDate();

        String ts = metadata.metadata.getVersioning().getSnapshot().getTimestamp();
        String datePart = DATE_FILTER.matcher(ts).replaceAll("");

//     -        metadata <- IV
//     -        metadata <- KeyID
//     -        metadata <- EncKey
//     -        metadata <- SealedKey
//     Output: enc_object_data, metadata
//
//  2. Decrypt:
//     Input: bucket, object, metadata, enc_object_data
//     -      KeyID  <- metadata
//     -      EncKey <- metadata
//     -          IV <- metadata
//     -   SealedKey <- metadata

         * same version index. Allowing the caller to pass in metadata from a previous deployment allows to re-establish
         * the association between the artifacts of the same project.
         */
        for (Iterator<? extends Metadata> it = metadatas.iterator(); it.hasNext(); ) {
            Metadata metadata = it.next();
            if (metadata instanceof PluginsMetadata pluginsMetadata) {
                it.remove();

### Internal metadata for replication

`xl.meta` that is in use for [versioning](https://github.com/minio/minio/blob/master/docs/bucket/versioning/DESIGN.md) has additional metadata for replication of objects,delete markers and versioned deletes.

    }

    private static Metadata createMetadataFromArtifact(Artifact artifact) {
        Metadata metadata = new Metadata();
        metadata.setArtifactId(artifact.getArtifactId());
        metadata.setGroupId(artifact.getGroupId());
        metadata.setVersion(artifact.getVersion());
        metadata.setVersioning(new Versioning());
        return metadata;
    }

import java.util.Map;

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

/**
 * Maven local GAV level metadata.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead

 -----
 Hervé Boutemy
 -----
 2009-04-26
 -----

Maven Repository Metadata Model

 This is strictly the model for Maven Repository Metadata, so really just plain objects.

 The metadata file name is:

 * <<<maven-metadata.xml>>> in a remote repository,

 * <<<maven-metadata-\<repo-id>.xml>>> in a local repository, for metadata from a repository with <<<repo-id>>> identifier.

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