xenadmin/XenAdmin/Alerts/NewVersionPriorityAlertComparer.cs

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using System.Collections.Generic;

namespace XenAdmin.Alerts
{
    public class NewVersionPriorityAlertComparer : IComparer<Alert>
    {
        public int Compare(Alert alert1, Alert alert2)
        {
            if (alert1 == null || alert2 == null)
                return 0;

            int sortResult = 0;

            if (IsVersionOrVersionUpdateAlert(alert1) && !IsVersionOrVersionUpdateAlert(alert2))
                sortResult = 1;

            if (!IsVersionOrVersionUpdateAlert(alert1) && IsVersionOrVersionUpdateAlert(alert2))
                sortResult = -1;

            if (sortResult == 0)
                sortResult = Alert.CompareOnDate(alert1, alert2);

            return -sortResult;
        }

        private bool IsVersionOrVersionUpdateAlert(Alert alert)
        {
            return alert is XenServerPatchAlert xspAlert && xspAlert.ShowAsNewVersion
                || alert is XenServerVersionAlert
                || alert is ClientUpdateAlert;
        }
    }
}