Added LinqToHqlGeneratorsRegistryFactory to create Generators Registry from configuration properties and through ObjectsFactory

SVN: trunk@5071

Author: fabiomaulo

src/NHibernate.Test/Linq/LinqToHqlGeneratorsRegistryFactoryTest.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Reflection;
+using NHibernate.Linq.Functions;
+using NUnit.Framework;
+using SharpTestsEx;
+using Environment = NHibernate.Cfg.Environment;
+
+namespace NHibernate.Test.Linq
+{
+	public class LinqToHqlGeneratorsRegistryFactoryTest
+	{
+		[Test]
+		public void WhenNotDefinedThenReturnDefaultRegistry()
+		{
+			var registry = LinqToHqlGeneratorsRegistryFactory.CreateGeneratorsRegistry(new Dictionary<string, string>());
+			registry.Should().Not.Be.Null();
+			registry.Should().Be.OfType<FunctionRegistry>();
+		}
+
+		[Test]
+		public void WhenDefinedThenReturnCustomtRegistry()
+		{
+			var properties = new Dictionary<string, string> { { Environment.LinqToHqlGeneratorsRegistry, typeof(MyLinqToHqlGeneratorsRegistry).AssemblyQualifiedName } };
+			var registry = LinqToHqlGeneratorsRegistryFactory.CreateGeneratorsRegistry(properties);
+			registry.Should().Not.Be.Null();
+			registry.Should().Be.OfType<MyLinqToHqlGeneratorsRegistry>();
+		}
+
+		private class MyLinqToHqlGeneratorsRegistry : ILinqToHqlGeneratorsRegistry
+		{
+			public bool TryGetGenerator(MethodInfo method, out IHqlGeneratorForMethod generator)
+			{
+				throw new NotImplementedException();
+			}
+
+			public bool TryGetGenerator(MemberInfo property, out IHqlGeneratorForProperty generator)
+			{
+				throw new NotImplementedException();
+			}
+
+			public void RegisterGenerator(MethodInfo method, IHqlGeneratorForMethod generator)
+			{
+				throw new NotImplementedException();
+			}
+
+			public void RegisterGenerator(MemberInfo property, IHqlGeneratorForProperty generator)
+			{
+				throw new NotImplementedException();
+			}
+		}
+	}
+}

src/NHibernate.Test/NHibernate.Test.csproj

@@ -425,6 +425,7 @@
     <Compile Include="Linq\LinqQuerySamples.cs" />
     <Compile Include="Linq\LinqReadonlyTestsContext.cs" />
     <Compile Include="Linq\LinqTestCase.cs" />
+    <Compile Include="Linq\LinqToHqlGeneratorsRegistryFactoryTest.cs" />
     <Compile Include="Linq\MethodCallTests.cs" />
     <Compile Include="Linq\MiscellaneousTextFixture.cs" />
     <Compile Include="Linq\NorthwindDbCreator.cs" />

src/NHibernate/Cfg/Environment.cs

@@ -159,6 +159,8 @@ public static string Version
 		public const string DefaultBatchFetchSize = "default_batch_fetch_size";
 
 		public const string CollectionTypeFactoryClass = "collectiontype.factory_class";
+		
+		public const string LinqToHqlGeneratorsRegistry = "linqtohql.generatorsregistry";
 
 		private static readonly Dictionary<string, string> GlobalProperties;
 

src/NHibernate/Linq/Functions/LinqToHqlGeneratorsRegistryFactory.cs

@@ -0,0 +1,32 @@
+using System;
+using System.Collections.Generic;
+using log4net;
+using NHibernate.Util;
+using Environment = NHibernate.Cfg.Environment;
+
+namespace NHibernate.Linq.Functions
+{
+	public sealed class LinqToHqlGeneratorsRegistryFactory
+	{
+		private static readonly ILog log = LogManager.GetLogger(typeof (LinqToHqlGeneratorsRegistryFactory));
+
+		public static ILinqToHqlGeneratorsRegistry CreateGeneratorsRegistry(IDictionary<string, string> properties)
+		{
+			string registry;
+			if (properties.TryGetValue(Environment.LinqToHqlGeneratorsRegistry, out registry))
+			{
+				try
+				{
+					log.Info("Initializing LinqToHqlGeneratorsRegistry: " + registry);
+					return (ILinqToHqlGeneratorsRegistry) Environment.BytecodeProvider.ObjectsFactory.CreateInstance(ReflectHelper.ClassForName(registry));
+				}
+				catch (Exception e)
+				{
+					log.Fatal("Could not instantiate LinqToHqlGeneratorsRegistry", e);
+					throw new HibernateException("Could not instantiate LinqToHqlGeneratorsRegistry: " + registry, e);
+				}
+			}
+			return new FunctionRegistry();
+		}
+	}
+}

src/NHibernate/NHibernate.csproj

@@ -655,6 +655,7 @@
     <Compile Include="Linq\Expressions\AggregateExpressionNode.cs" />
     <Compile Include="Linq\EagerFetchingExtensionMethods.cs" />
     <Compile Include="Linq\Functions\ILinqToHqlGeneratorsRegistry.cs" />
+    <Compile Include="Linq\Functions\LinqToHqlGeneratorsRegistryFactory.cs" />
     <Compile Include="Linq\LinqExtensionMethodAttribute.cs" />
     <Compile Include="Linq\TypeHelperExtensionMethods.cs" />
     <Compile Include="Linq\Visitors\NameUnNamedParameters.cs" />