[Nhibernate-commit] SF.net SVN: nhibernate:[5317] trunk/nhibernate/src/NHibernate

[<fab...@us...>]

Revision: 5317
          http://nhibernate.svn.sourceforge.net/nhibernate/?rev=5317&view=rev
Author:   fabiomaulo
Date:     2010-12-15 21:57:25 +0000 (Wed, 15 Dec 2010)

Log Message:
-----------
First as enumerable extensions

Modified Paths:
--------------
    trunk/nhibernate/src/NHibernate/Util/EnumerableExtensions.cs
    trunk/nhibernate/src/NHibernate.Test/NHibernate.Test.csproj

Added Paths:
-----------
    trunk/nhibernate/src/NHibernate.Test/UtilityTest/EnumerableExtensionsTests/FirstExtensionTests.cs

Modified: trunk/nhibernate/src/NHibernate/Util/EnumerableExtensions.cs
===================================================================
--- trunk/nhibernate/src/NHibernate/Util/EnumerableExtensions.cs	2010-12-15 21:36:23 UTC (rev 5316)
+++ trunk/nhibernate/src/NHibernate/Util/EnumerableExtensions.cs	2010-12-15 21:57:25 UTC (rev 5317)
@@ -21,6 +21,33 @@
 			return false;
 		}
 
+		public static object First(this IEnumerable source)
+		{
+			if (source == null)
+			{
+				throw new ArgumentNullException("source");
+			}
+			IList collection = source as IList;
+			if (collection != null)
+			{
+				if (collection.Count > 0)
+				{
+					return collection[0];
+				}
+			}
+			else
+			{
+				using (DisposableEnumerator enumerator = source.GetDisposableEnumerator())
+				{
+					if (enumerator.MoveNext())
+					{
+						return enumerator.Current;
+					}
+				}
+			}
+			throw new InvalidOperationException("Sequence contains no elements");
+		}
+
 		private static DisposableEnumerator GetDisposableEnumerator(this IEnumerable source)
 		{
 			return new DisposableEnumerator(source);

Modified: trunk/nhibernate/src/NHibernate.Test/NHibernate.Test.csproj
===================================================================
--- trunk/nhibernate/src/NHibernate.Test/NHibernate.Test.csproj	2010-12-15 21:36:23 UTC (rev 5316)
+++ trunk/nhibernate/src/NHibernate.Test/NHibernate.Test.csproj	2010-12-15 21:57:25 UTC (rev 5317)
@@ -581,6 +581,7 @@
     <Compile Include="TypesTest\XmlDocClass.cs" />
     <Compile Include="TypesTest\XmlDocTypeFixture.cs" />
     <Compile Include="UtilityTest\EnumerableExtensionsTests\AnyExtensionTests.cs" />
+    <Compile Include="UtilityTest\EnumerableExtensionsTests\FirstExtensionTests.cs" />
     <Compile Include="UtilityTest\ReflectionHelperIsMethodOfTests.cs" />
     <Compile Include="UtilityTest\ReflectionHelperTest.cs" />
     <Compile Include="Linq\RegresstionTests.cs" />

Added: trunk/nhibernate/src/NHibernate.Test/UtilityTest/EnumerableExtensionsTests/FirstExtensionTests.cs
===================================================================
--- trunk/nhibernate/src/NHibernate.Test/UtilityTest/EnumerableExtensionsTests/FirstExtensionTests.cs	                        (rev 0)
+++ trunk/nhibernate/src/NHibernate.Test/UtilityTest/EnumerableExtensionsTests/FirstExtensionTests.cs	2010-12-15 21:57:25 UTC (rev 5317)
@@ -0,0 +1,29 @@
+using System;
+using System.Collections;
+using NHibernate.Util;
+using NUnit.Framework;
+using SharpTestsEx;
+
+namespace NHibernate.Test.UtilityTest.EnumerableExtensionsTests
+{
+	public class FirstExtensionTests
+	{
+		[Test]
+		public void WhenNullThenThenThrows()
+		{
+			Executing.This(() => ((IEnumerable)null).First()).Should().Throw<ArgumentNullException>();
+		}
+
+		[Test]
+		public void WhenHasElementsThenReturnFirst()
+		{
+			(new[] { 2, 1 }).First().Should().Be(2);
+		}
+
+		[Test]
+		public void WhenEmptyThenThrowsInvalidOperation()
+		{
+			Executing.This(() => (new object[0]).First()).Should().Throw<InvalidOperationException>();
+		}
+	}
+}
\ No newline at end of file


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