return null;
        }

        @Override
        public String pathOfRemoteRepositoryMetadata(ArtifactMetadata artifactMetadata) {
            return null;
        }

        @Override
        public String pathOfLocalRepositoryMetadata(ArtifactMetadata metadata, ArtifactRepository repository) {
            return null;
        }

        @Override
        public String getUrl() {

            sb.append(':');
            sb.append(getClassifier());
        }
    }

    @Override
    public void addMetadata(ArtifactMetadata metadata) {
        if (metadataMap == null) {
            metadataMap = new HashMap<>();
        }

        ArtifactMetadata m = metadataMap.get(metadata.getKey());
        if (m != null) {
            m.merge(metadata);
        } else {

        return artifact.getDependencyConflictId();
    }

    /** {@inheritDoc} */
    @Override
    public void addMetadata(ArtifactMetadata metadata) {
        artifact.addMetadata(metadata);
    }

    /** {@inheritDoc} */
    @Override
    public Collection<ArtifactMetadata> getMetadataList() {
        return artifact.getMetadataList();
    }

    /** {@inheritDoc} */
    @Override

            return "test";
        }

        @Override
        public String pathOfRemoteRepositoryMetadata(ArtifactMetadata metadata) {
            return "path";
        }

        @Override
        public String pathOfLocalRepositoryMetadata(ArtifactMetadata metadata, ArtifactRepository repository) {
            return "path";
        }

        @Override

import java.io.OutputStream;
import java.nio.file.Files;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.artifact.metadata.ArtifactMetadata;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.repository.ArtifactRepositoryPolicy;
import org.apache.maven.artifact.repository.DefaultRepositoryRequest;

    }

    @Override
    public void putArtifactMetadata(File source, ArtifactMetadata artifactMetadata, ArtifactRepository repository)
            throws TransferFailedException {
        logger.info("Uploading " + artifactMetadata);
        putRemoteFile(repository, source, repository.pathOfRemoteRepositoryMetadata(artifactMetadata), null);
    }

    @Override
    public void putRemoteFile(

        MetadataGraphVertex vertex = new MetadataGraphVertex(node.md, versionedVertices, scopedVertices);
        vertices.add(vertex);

        if (parentVertex != null) // then create the edge
        {
            ArtifactMetadata md = node.getMd();
            MetadataGraphEdge e =
                    new MetadataGraphEdge(md.version, md.resolved, md.artifactScope, md.artifactUri, depth, pomOrder);
            addEdge(parentVertex, vertex, e);

        }

        @Override
        public String pathOfLocalRepositoryMetadata(ArtifactMetadata metadata, ArtifactRepository repository) {
            return fallback.pathOfLocalRepositoryMetadata(metadata, repository);
        }

        @Override
        public String pathOfRemoteRepositoryMetadata(ArtifactMetadata metadata) {
            return fallback.pathOfRemoteRepositoryMetadata(metadata);
        }