* including one (so the map size cannot be used as a criterion).
     *
     * @see #isModuleHierarchy()
     */
    private final boolean isModuleHierarchy;

    /**
     * Constructs an empty instance for non-modular dependencies.
     *
     * @see #NONE
     */
    private PathModularization() {
        filename = "(none)";
        descriptors = Collections.emptyMap();