Reuse instance

Author: bahusoid

src/NHibernate.Test/NHSpecificTest/NH3957/ResultTransformerEqualityFixture.cs

@@ -31,7 +31,6 @@ public void Setup()
 			var hasherForAll = typeof(AliasToEntityMapResultTransformer)
 				.GetField("Hasher", BindingFlags.Static | BindingFlags.NonPublic)
 				.GetValue(null);
-			TweakHashcode(typeof(DistinctRootEntityResultTransformer), hasherForAll);
 			TweakHashcode(typeof(PassThroughResultTransformer), hasherForAll);
 			TweakHashcode(typeof(RootEntityResultTransformer), hasherForAll);
 			TweakHashcode(typeof(ToListResultTransformer), hasherForAll);
@@ -133,4 +132,4 @@ public void ToListEquality()
 			Assert.IsTrue(transf2.Equals(transf1));
 		}
 	}
-}
+}

src/NHibernate/Criterion/CriteriaSpecification.cs

@@ -33,7 +33,7 @@ static CriteriaSpecification()
 		{
 			AliasToEntityMap = new AliasToEntityMapResultTransformer();
 			RootEntity = new RootEntityResultTransformer();
-			DistinctRootEntity = new DistinctRootEntityResultTransformer();
+			DistinctRootEntity = DistinctRootEntityResultTransformer.Instance;
 			Projection = new PassThroughResultTransformer();
 			InnerJoin = JoinType.InnerJoin;
 			FullJoin = JoinType.FullJoin;

src/NHibernate/Linq/IntermediateHqlTree.cs

@@ -110,7 +110,7 @@ public void AddDistinctRootOperator()
 			if (!_hasDistinctRootOperator)
 			{
 				Expression<Func<IEnumerable<object>, IList>> x =
-					l => new DistinctRootEntityResultTransformer().TransformList(l.ToList());
+					l => Transformers.DistinctRootEntity.TransformList(l.ToList());
 
 				_listTransformers.Add(x);
 				_hasDistinctRootOperator = true;

src/NHibernate/Transform/DistinctRootEntityResultTransformer.cs

@@ -10,7 +10,7 @@ namespace NHibernate.Transform
 	public class DistinctRootEntityResultTransformer : IResultTransformer, ITupleSubsetResultTransformer
 	{
 		private static readonly INHibernateLogger log = NHibernateLogger.For(typeof(DistinctRootEntityResultTransformer));
-		private static readonly object Hasher = new object();
+		internal static readonly DistinctRootEntityResultTransformer Instance = new DistinctRootEntityResultTransformer();
 
 		internal sealed class IdentityComparer : IEqualityComparer<object>
 		{
@@ -81,7 +81,7 @@ public override bool Equals(object obj)
 
 		public override int GetHashCode()
 		{
-			return Hasher.GetHashCode();
+			return Instance.GetHashCode();
 		}
 	}
 }

src/NHibernate/Transform/Transformers.cs

@@ -44,7 +44,7 @@ public static IResultTransformer AliasToBean<T>()
 			return AliasToBean(typeof(T));
 		}
 
-		public static readonly IResultTransformer DistinctRootEntity = new DistinctRootEntityResultTransformer();
+		public static readonly IResultTransformer DistinctRootEntity = DistinctRootEntityResultTransformer.Instance;
 
 		public static IResultTransformer AliasToBeanConstructor(System.Reflection.ConstructorInfo constructor)
 		{