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Framework/Localization/ExceptionLocalizer.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using Kreta.Framework.Caching;
+
+namespace Kreta.Framework.Localization
+{
+    /// <summary>
+    /// Kivételek nyelvesítésére szolgáló <see cref="ILocalizer"/> megvalósítás.
+    /// </summary>
+    internal class ExceptionLocalizer : ILocalizer
+    {
+        private static object SyncObject = new object();
+        // <<Monostate>>
+        private static readonly Dictionary<Type, FriendlyNameAttribute> friendlyNameAttributeCache = new Dictionary<Type, FriendlyNameAttribute>();
+
+        string ILocalizer.Localize(object value, CultureInfo cultureInfo)
+        {
+            return Localize((Exception)value, cultureInfo);
+        }
+
+        public virtual string Localize(Exception exception, CultureInfo cultureInfo)
+        {
+            FriendlyNameAttribute attribute;
+            lock (SyncObject)
+            {
+                var exceptionType = exception.GetType();
+                if (!friendlyNameAttributeCache.TryGetValue(exceptionType, out attribute))
+                {
+                    attribute = (FriendlyNameAttribute)exceptionType.GetCustomAttributes(typeof(FriendlyNameAttribute), true).FirstOrDefault(); //inherited but allowed only one
+                    friendlyNameAttributeCache[exceptionType] = attribute;
+                }
+            }
+
+            if (attribute != null)
+            {
+                if (attribute.StringResourceId == -1)
+                {
+                    return string.Empty;
+                }
+
+                return SDAServer.Instance.CacheManager.AquireCache<StringResourcesCache>().Get(attribute.StringResourceId, cultureInfo.LCID, attribute.DisplayText);
+            }
+            return exception.Message;
+        }
+    }
+}