some preliminary work to move decision engine to use the visitor pattern.

NzbDrone.Core/DecisionEngine/Specifications/LanguageSpecification.cs

@@ -0,0 +1,35 @@
+using NLog;
+using NzbDrone.Core.Model;
+
+namespace NzbDrone.Core.DecisionEngine.Specifications
+{
+    public class LanguageSpecification : IFetchableSpecification
+    {
+        private readonly Logger _logger;
+
+        public LanguageSpecification(Logger logger)
+        {
+            _logger = logger;
+        }
+
+        public string RejectionReason
+        {
+            get
+            {
+                return "Not English";
+            }
+        }
+
+        public virtual bool IsSatisfiedBy(EpisodeParseResult subject)
+        {
+            _logger.Trace("Checking if report meets language requirements. {0}", subject.Language);
+            if (subject.Language != LanguageType.English)
+            {
+                _logger.Trace("Report Language: {0} rejected because it is not English", subject.Language);
+                return false;
+            }
+
+            return true;
+        }
+    }
+}