rewrite of indexer/episode search

NzbDrone.Core/DecisionEngine/Specifications/Search/SingleEpisodeMatchSpecification.cs

@@ -0,0 +1,44 @@
+using NLog;
+using NzbDrone.Core.IndexerSearch.Definitions;
+using NzbDrone.Core.Model;
+
+namespace NzbDrone.Core.DecisionEngine.Specifications.Search
+{
+    public class SingleEpisodeMatchSpecification : IDecisionEngineSearchSpecification
+    {
+        private readonly Logger _logger;
+
+        public SingleEpisodeMatchSpecification(Logger logger)
+        {
+            _logger = logger;
+        }
+
+        public string RejectionReason
+        {
+            get
+            {
+                return "Episode doesn't match";
+            }
+        }
+
+        public bool IsSatisfiedBy(EpisodeParseResult episodeParseResult, SearchDefinitionBase searchDefinitionBase)
+        {
+            var singleEpisodeSpec = searchDefinitionBase as SingleEpisodeSearchDefinition;
+            if (singleEpisodeSpec == null) return true;
+
+            if (singleEpisodeSpec.SeasonNumber != episodeParseResult.SeasonNumber)
+            {
+                _logger.Trace("Season number does not match searched season number, skipping.");
+                return false;
+            }
+
+            if (!episodeParseResult.EpisodeNumbers.Contains(singleEpisodeSpec.EpisodeNumber))
+            {
+                _logger.Trace("Episode number does not match searched episode number, skipping.");
+                return false;
+            }
+
+            return true;
+        }
+    }
+}