Improved Quality lookup.

src/NzbDrone.Core/Qualities/Quality.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using NzbDrone.Common.Extensions;
 using NzbDrone.Core.Datastore;
 
 namespace NzbDrone.Core.Qualities
@@ -72,15 +73,13 @@ namespace NzbDrone.Core.Qualities
         //public static Quality WEBRip720p  { get { return new Quality(14, "WEBRip-720p"); } }
         //public static Quality WEBRip1080p { get { return new Quality(15, "WEBRip-1080p"); } }
         public static Quality HDTV2160p   { get { return new Quality(16, "HDTV-2160p"); } }
-        //public static Quality WEBRip2160p { get { return new Quality(17, "WEBRip-1080p"); } }
+        //public static Quality WEBRip2160p { get { return new Quality(17, "WEBRip-2160p"); } }
         public static Quality WEBDL2160p  { get { return new Quality(18, "WEBDL-2160p"); } }
         public static Quality Bluray2160p { get { return new Quality(19, "Bluray-2160p"); } }
         
-        public static List<Quality> All
+        static Quality()
         {
-            get
-            {
-                return new List<Quality>
+            All = new List<Quality>
             {
                 Unknown,
                 SDTV,
@@ -97,14 +96,14 @@ namespace NzbDrone.Core.Qualities
                 WEBDL2160p,
                 Bluray2160p,
             };
-            }
-        }
 
-        public static HashSet<QualityDefinition> DefaultQualityDefinitions
+            AllLookup = new Quality[All.Select(v => v.Id).Max() + 1];
+            foreach (var quality in All)
             {
-            get
-            {
-                return new HashSet<QualityDefinition>
+                AllLookup[quality.Id] = quality;
+            }
+
+            DefaultQualityDefinitions = new HashSet<QualityDefinition>
             {
                 new QualityDefinition(Quality.Unknown)     { Weight = 1,  MinSize = 0, MaxSize = 100 },
                 new QualityDefinition(Quality.SDTV)        { Weight = 2,  MinSize = 0, MaxSize = 100 },
@@ -122,13 +121,18 @@ namespace NzbDrone.Core.Qualities
                 new QualityDefinition(Quality.Bluray2160p) { Weight = 14, MinSize = 0, MaxSize = null },
             };
         }
-        }
+
+        public static readonly List<Quality> All;
+
+        public static readonly Quality[] AllLookup;
+
+        public static readonly HashSet<QualityDefinition> DefaultQualityDefinitions;
 
         public static Quality FindById(int id)
         {
             if (id == 0) return Unknown;
 
-            Quality quality = All.FirstOrDefault(v => v.Id == id);
+            var quality = AllLookup[id];
 
             if (quality == null)
                 throw new ArgumentException("ID does not match a known quality", "id");