public void addMetadata(ArtifactMetadata metadata) {
        artifact.addMetadata(metadata);
    }

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

    /** {@inheritDoc} */
    @Override
    public void setRepository(ArtifactRepository remoteRepository) {
        artifact.setRepository(remoteRepository);
    }

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

    @Override
    public Collection<ArtifactMetadata> getMetadataList() {
        if (metadataMap == null) {
            return Collections.emptyList();
        }

        return Collections.unmodifiableCollection(metadataMap.values());
    }