artifactMap.put(versionlessKey(artifact), artifact);
            }
        }

        return artifactMap;
    }

    public static Artifact copyArtifactSafe(Artifact artifact) {
        return (artifact != null) ? copyArtifact(artifact) : null;
    }

    public static Artifact copyArtifact(Artifact artifact) {
        VersionRange range = artifact.getVersionRange();