public void metadataInvalid(RepositoryEvent event) {
        Exception exception = event.getException();

        Object metadata;
        if (event.getMetadata().getFile() != null) {
            metadata = event.getMetadata().getFile();
        } else {
            metadata = event.getMetadata();
        }

        String errorType = " is invalid";
        if (exception instanceof FileNotFoundException) {

            }

            RepositoryMetadata metadata = new SnapshotArtifactRepositoryMetadata(artifact, snapshot);

            artifact.setResolvedVersion(
                    constructVersion(metadata.getMetadata().getVersioning(), artifact.getBaseVersion()));

            artifact.addMetadata(metadata);
        }
    }

    public String getDeploymentTimestamp() {
        if (deploymentTimestamp == null) {

    private final Date timestamp;

    PluginsMetadataGenerator(RepositorySystemSession session, InstallRequest request) {
        this(session, request.getMetadata());
    }

    PluginsMetadataGenerator(RepositorySystemSession session, DeployRequest request) {
        this(session, request.getMetadata());
    }

    private PluginsMetadataGenerator(RepositorySystemSession session, Collection<? extends Metadata> metadatas) {

        this.metadata.merge(repoMetadata.getMetadata());
    }

    public void merge(ArtifactMetadata metadata) {
        // TODO not sure that it should assume this, maybe the calls to addMetadata should pre-merge, then artifact
        // replaces?
        AbstractRepositoryMetadata repoMetadata = (AbstractRepositoryMetadata) metadata;
        this.metadata.merge(repoMetadata.getMetadata());
    }

                    if (!remoteFile.exists()) {
                        download.setException(new MetadataNotFoundException(download.getMetadata(), repository));
                    } else {
                        download.setException(new MetadataTransferException(download.getMetadata(), repository, e));
                    }
                }
            }
        }
    }

        LocalMetadataResult result = new LocalMetadataResult(request);

        String path;

        Metadata metadata = request.getMetadata();
        String context = request.getContext();
        RemoteRepository remote = request.getRepository();

        if (remote != null) {
            path = getPathForRemoteMetadata(metadata, remote, context);

        LocalMetadataResult result = new LocalMetadataResult(request);

        String path;

        Metadata metadata = request.getMetadata();
        String context = request.getContext();
        RemoteRepository remote = request.getRepository();

        if (remote != null) {
            path = getPathForRemoteMetadata(metadata, remote, context);

        }

        return result;
    }

    public LocalMetadataResult find(RepositorySystemSession session, LocalMetadataRequest request) {
        Metadata metadata = request.getMetadata();

        String path;
        if (request.getRepository() == null) {
            path = getPathForLocalMetadata(metadata);
        } else {

            List<MetadataResult> results,
            List<MetadataRequest> requests) {
        for (MetadataResult res : results) {
            org.eclipse.aether.metadata.Metadata metadata = res.getMetadata();

            if (metadata != null) {
                ArtifactRepository repository = res.getRequest().getRepository();
                if (repository == null) {

    /**
     * Get the repository metadata associated with this marker.
     *
     * @return the metadata, or <code>null</code> if none loaded
     */
    Metadata getMetadata();

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

    /**
     * Whether this represents a snapshot.
     *