xenadmin/XenAdmin/Diagnostics/Hotfixing/HotfixFactory.cs

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using System;
using XenAdmin.Core;
using XenAPI;

namespace XenAdmin.Diagnostics.Hotfixing
{
    internal sealed class HotfixFactory
    {
        public enum HotfixableServerVersion
        {
            Clearwater,
            Creedence,
            Dundee,
            ElyKolkata
        }

        private readonly Hotfix clearwaterHotfix = new SingleHotfix
        {
            Filename = "RPU001",
            UUID = "591d0209-531e-4ed8-9ed2-98df2a1a445c"
        };

        private readonly Hotfix creedenceHotfix = new SingleHotfix
        {
            Filename = "RPU002",
            UUID = "3f92b111-0a90-4ec6-b85a-737f241a3fc1 "
        };

        private readonly Hotfix dundeeHotfix = new SingleHotfix
        {
            Filename = "RPU003",
            UUID = "f6014211-7611-47ac-ac4c-e66bb1692c35"
        };

        private readonly Hotfix elyKolkataHotfix = new SingleHotfix
        {
            Filename = "RPU004",
            UUID = "ddd68553-2bf8-411d-99bc-ed4a95265840"
        };

        public Hotfix Hotfix(Host host)
        {
            if (Helpers.ElyOrGreater(host) && !Helpers.LimaOrGreater(host))
                return Hotfix(HotfixableServerVersion.ElyKolkata);
            if (Helpers.DundeeOrGreater(host) && !Helpers.ElyOrGreater(host))
                return Hotfix(HotfixableServerVersion.Dundee);
            if (Helpers.CreedenceOrGreater(host) && !Helpers.DundeeOrGreater(host))
                return Hotfix(HotfixableServerVersion.Creedence);
            if (!Helpers.CreedenceOrGreater(host))
                return Hotfix(HotfixableServerVersion.Clearwater);

            return null;
        }

        public Hotfix Hotfix(HotfixableServerVersion version)
        {
            if (version == HotfixableServerVersion.ElyKolkata)
                return elyKolkataHotfix;
            if (version == HotfixableServerVersion.Dundee)
                return dundeeHotfix;
            if (version == HotfixableServerVersion.Creedence)
                return creedenceHotfix;
            if (version == HotfixableServerVersion.Clearwater)
                return clearwaterHotfix;

            throw new ArgumentException("A version was provided for which there is no hotfix filename");
        }

        public bool IsHotfixRequired(Host host)
        {
            return Hotfix(host) != null;
        }
    }
}