* @throws RepositoryMetadataDeploymentException in case of metadata deployment issue
     */
    void deploy(ArtifactMetadata metadata, ArtifactRepository localRepository, ArtifactRepository deploymentRepository)
            throws RepositoryMetadataDeploymentException;

    /**
     * Install the metadata in the local repository.
     *
     * @param metadata        the metadata
     * @param localRepository the local repository

            RequestTrace trace,
            Metadata metadata,
            ArtifactRepository repository,
            VersionRangeResult result) {
        Versioning versioning = null;
        try {
            if (metadata != null) {
                try (SyncContext syncContext = syncContextFactory.newInstance(session, true)) {
                    syncContext.acquire(null, Collections.singleton(metadata));

        }

        for (Object metadata : result.getMetadata()) {
            if (metadata.getClass().getName().endsWith(".internal.VersionsMetadata")) {
                relatedMetadata.put(versionKey, (MergeableMetadata) metadata);
            }
            if (snapshotKey != null && metadata.getClass().getName().endsWith(".internal.RemoteSnapshotMetadata")) {

            if (node2.metadata == null) {
                return metadata == null;
            }

            return metadata != null && metadata.toString().equals(node2.metadata.toString());
        } else {
            return super.equals(obj);
        }
    }

    @Override
    public int hashCode() {
        if (metadata == null) {
            return super.hashCode();
        }

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadata;
import org.apache.maven.artifact.repository.metadata.RepositoryMetadataResolutionException;
import org.apache.maven.artifact.repository.metadata.Snapshot;
import org.apache.maven.artifact.repository.metadata.SnapshotArtifactRepositoryMetadata;

import java.util.List;

import org.apache.maven.api.annotations.Nonnull;
import org.apache.maven.api.annotations.Nullable;
import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.artifact.repository.metadata.Plugin;

/**
 * Maven G level metadata.
 *
 * @deprecated since 4.0.0, use {@code maven-api-impl} jar instead
 */
@Deprecated(since = "4.0.0")
final class PluginsMetadata extends MavenMetadata {

		},
		// Empty header input returns empty metadata.
		{
			header:     nil,
			metadata:   nil,
			shouldFail: true,
		},
	}

	// Validate if the extracting headers.
	for i, testCase := range testCases {
		metadata := make(map[string]string)
		err := extractMetadataFromMime(t.Context(), textproto.MIMEHeader(testCase.header), metadata)
		if err != nil && !testCase.shouldFail {

		Name:           metadata.KeyID,
		Ciphertext:     metadata.KMSKey,
		AssociatedData: associatedData,
	})
	if err != nil {
		return nil, err
	}
	stream, err := metadata.Algorithm.Stream(key)
	if err != nil {
		return nil, err
	}
	if stream.NonceSize() != len(metadata.Nonce) {
		return nil, sio.NotAuthentic
	}
	return stream.DecryptReader(ciphertext, metadata.Nonce, nil), nil
}

            <model>../../api/maven-api-metadata/src/main/mdo/metadata.mdo</model>
          </models>
          <params>
            <param>forcedIOModelVersion=1.1.0</param>
            <param>packageModelV3=org.apache.maven.artifact.repository.metadata</param>
            <param>packageModelV4=org.apache.maven.api.metadata</param>
            <param>packageToolV4=org.apache.maven.artifact.repository.metadata.io</param>
          </params>

import java.util.Objects;

import org.apache.maven.artifact.repository.metadata.Metadata;
import org.apache.maven.metadata.v4.MetadataStaxReader;

/**
 * Handles deserialization of metadata from some kind of textual format like XML.
 *
 */
@Named
@Singleton
public class DefaultMetadataReader implements MetadataReader {

    @Override
    public Metadata read(File input, Map<String, ?> options) throws IOException {