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,
            ElyFalcon
        }

        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 = "474a0f28-0d33-4c9b-9e20-52baaea8ce5e"
        };

        private readonly Hotfix elyFalconHotfix = new SingleHotfix
        {
            Filename = "RPU004",
            UUID = "439235bf-48fa-4ee3-9c11-d67084a01205"
        };

        public Hotfix Hotfix(Host host)
        {
            if (Helpers.ElyOrGreater(host) && !Helpers.InvernessOrGreater(host))
                return Hotfix(HotfixableServerVersion.ElyFalcon);
            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.ElyFalcon)
                return elyFalconHotfix;
            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;
        }
    }
}