xenadmin/XenAdmin/Dialogs/LicenseManager/SelectionVerifiers/OlderServerVerifier.cs

/* Copyright (c) Citrix Systems, Inc. 
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 *     following disclaimer. 
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using System.Collections.Generic;
using System.Linq;

namespace XenAdmin.Dialogs.LicenseManagerSelectionVerifiers
{
    public class OlderServerVerifier : LicenseSelectionVerifier
    {
        public OlderServerVerifier(List<LicenseDataGridViewRow> rowsToVerify) :base(rowsToVerify){}

        public override string VerificationDetails()
        {
            return Status == VerificationStatus.Error && RowsToVerify.Count > 1 ? Messages.LICENSE_NO_MULTISELECT_LICENSE : string.Empty;
        }


        public override void Verify()
        {
            if (RowsToVerify.Count < 1)
            {
                Status = VerificationStatus.Error;
                return;
            }

            bool allCanUseServer = RowsToVerify.TrueForAll(r => r.CanUseLicenseServer);
            int cannotUse = RowsToVerify.Where(r => !r.CanUseLicenseServer).ToList().Count;
            bool oldSelectionValid = cannotUse < 2 && cannotUse > 0 && cannotUse == RowsToVerify.Count;

            if (allCanUseServer || oldSelectionValid)
            {
                Status = VerificationStatus.OK;
                return;
            }
            
            Status = VerificationStatus.Error;
        }
    }
}