public HistoricalHashMap(final HistoryManager historyManager, final Object owner, final Map<? extends K, ? extends V> m)
    {
        super(historyManager, owner, new LinkedHashMap<>(m));
    }

    @Override
    public LinkedHashMap<K, V> get()
    {
        return getMap();
    }

    @Override
    public LinkedHashMap<K, V> get(final Duration time)
    {
        if (isLastState(time))
        {
            return getMap();
        }
        return fill(time, new LinkedHashMap<>());
    }

    @Override
    public String toString()
    {
        return "HistoricalHashMap [current=" + getMap() + "]";

}

        // ------------------------------------------- make datasets if needed
        if (this.connections == null)
        {
            this.connections = new LinkedHashMap<>();
        }

        if (!this.connections.containsKey(gtuType))
        {
            this.connections.put(gtuType, new LinkedHashMap<>());
        }

        Map<Link, Set<Link>> gtuMap = this.connections.get(gtuType);
        if (!gtuMap.containsKey(incomingLink))
        {
            gtuMap.put(incomingLink, new LinkedHashSet<>());
        }

        // ------------------------------------------- add the connection
        gtuMap.get(incomingLink).add(outgoingLink);