Timeline Grouping and mergeable events

@Named("groupingTimelineView")
@ViewScoped
public class GroupingTimelineView implements Serializable {

    private TimelineModel<Order, Truck> model;
    private TimelineModel<Order, Truck> model2;
    private TimelineEvent<Order> event; // current changed event
    private List<TimelineEvent<Order>> overlappedOrders; // all overlapped orders (events) to the changed order (event)
    private List<TimelineEvent<Order>> ordersToMerge; // selected orders (events) in the dialog which should be merged

    @PostConstruct
    protected void initialize() {
        // create timeline model
        model = newModelWithNumber(6);
        model2 = newModelWithNumber(30);

    }

    public TimelineModel<Order, Truck> newModelWithNumber(int n) {
        TimelineModel<Order, Truck> model = new TimelineModel<>();

        int orderNumber = 1;
        for (int j = 1; j <= n; j++) {
            model.addGroup(new TimelineGroup<Truck>("id" + j, new Truck(String.valueOf(9 + j))));
            LocalDateTime referenceDate = LocalDateTime.of(2015, Month.DECEMBER, 14, 8, 0);

            for (int i = 0; i < 6; i++) {
                LocalDateTime startDate = referenceDate.plusHours(3 * (Math.random() < 0.2 ? 1 : 0));
                LocalDateTime endDate = startDate.plusHours(2 + (int) Math.floor(Math.random() * 4));

                String imagePath = null;
                if (Math.random() < 0.25) {
                    imagePath = "images/timeline/box.png";
                }

                Order order = new Order(orderNumber, imagePath);
                model.add(TimelineEvent.<Order>builder()
                        .data(order)
                        .startDate(startDate)
                        .endDate(endDate)
                        .editable(true)
                        .group("id" + j)
                        .build());

                orderNumber++;
                referenceDate = endDate;
            }
        }

        return model;
    }

    public TimelineModel<Order, Truck> getModel() {
        return model;
    }

    public TimelineModel<Order, Truck> getModel2() {
        return model2;
    }

    public void onChange(TimelineModificationEvent<Order> e) {
        // get changed event and update the model
        event = e.getTimelineEvent();
        model.update(event);

        // get overlapped events of the same group as for the changed event
        Set<TimelineEvent<Order>> overlappedEvents = model.getOverlappedEvents(event);

        if (overlappedEvents == null) {
            // nothing to merge
            return;
        }

        // list of orders which can be merged in the dialog
        overlappedOrders = new ArrayList<>(overlappedEvents);

        // no pre-selection
        ordersToMerge = null;

        // update the dialog's content and show the dialog
        PrimeFaces primefaces = PrimeFaces.current();
        primefaces.ajax().update("form:overlappedOrdersInner");
        primefaces.executeScript("PF('overlapEventsWdgt').show()");
    }

    public void onDelete(TimelineModificationEvent<Order> e) {
        // keep the model up-to-date
        model.delete(e.getTimelineEvent());
    }

    public void merge() {
        // merge orders and update UI if the user selected some orders to be merged
        if (ordersToMerge != null && !ordersToMerge.isEmpty()) {
            model.merge(event, ordersToMerge, TimelineUpdater.getCurrentInstance(":form:timeline"));
        }
        else {
            FacesMessage msg
                    = new FacesMessage(FacesMessage.SEVERITY_INFO, "Nothing to merge, please choose orders to be merged", null);
            FacesContext.getCurrentInstance().addMessage(null, msg);
        }

        overlappedOrders = null;
        ordersToMerge = null;
    }

    public int getSelectedOrder() {
        if (event == null) {
            return 0;
        }

        return event.getData().getNumber();
    }

    public List<TimelineEvent<Order>> getOverlappedOrders() {
        return overlappedOrders;
    }

    public List<TimelineEvent<Order>> getOrdersToMerge() {
        return ordersToMerge;
    }

    public void setOrdersToMerge(List<TimelineEvent<Order>> ordersToMerge) {
        this.ordersToMerge = ordersToMerge;
    }

    public static class Truck implements java.io.Serializable {
        private final String code;

        public Truck(String code) {
            this.code = code;
        }

        public String getCode() {
            return code;
        }
    }
}

public class Order implements java.io.Serializable {

    private final int number;
    private final String imagePath;

    public Order(int number, String imagePath) {
        this.number = number;
        this.imagePath = imagePath;
    }

    public int getNumber() {
        return number;
    }

    public String getImagePath() {
        return imagePath;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }

        if (o == null || getClass() != o.getClass()) {
            return false;
        }

        Order order = (Order) o;

        return number == order.number;
    }

    @Override
    public int hashCode() {
        return number;
    }

}

@Named
@ApplicationScoped
@FacesConverter("org.primefaces.showcase.converter.OrderConverter")
public class OrderConverter implements Converter<TimelineEvent<Order>>, Serializable {

    private List<TimelineEvent<Order>> events;

    public OrderConverter() {
    }

    @Override
    public TimelineEvent<Order> getAsObject(FacesContext context, UIComponent component, String value) {
        if (value == null || value.isEmpty() || events == null || events.isEmpty()) {
            return null;
        }

        for (TimelineEvent<Order> event : events) {
            if (event.getData().getNumber() == Integer.valueOf(value)) {
                return event;
            }
        }

        return null;
    }

    @Override
    public String getAsString(FacesContext context, UIComponent component, TimelineEvent<Order> value) {
        if (value == null) {
            return null;
        }

        return String.valueOf(value.getData().getNumber());
    }

    public List<TimelineEvent<Order>> getEvents() {
        return events;
    }

    public void setEvents(List<TimelineEvent<Order>> events) {
        this.events = events;
    }
}