From 043aa0b6ef2a1ffea33a45419fb395f218131c37 Mon Sep 17 00:00:00 2001
From: unknown <eh2weld@.zitd.global.commerzbank.com>
Date: Tue, 14 Sep 2010 17:02:05 +0200
Subject: [PATCH 1/2] CreateIndex

---
 source/MongoDB/IMongoCollection_1.cs |   12 +++++++
 source/MongoDB/MongoCollection_1.cs  |   53 ++++++++++++++++++++++++++++++++++
 source/MongoDB/MongoDB.csproj        |    1 +
 3 files changed, 66 insertions(+), 0 deletions(-)

diff --git a/source/MongoDB/IMongoCollection_1.cs b/source/MongoDB/IMongoCollection_1.cs
index 9ddfa88..6ed8df2 100644
--- a/source/MongoDB/IMongoCollection_1.cs
+++ b/source/MongoDB/IMongoCollection_1.cs
@@ -1,5 +1,7 @@
 using System;
 using System.Collections.Generic;
+using System.Linq.Expressions;
+using MongoDB.Protocol;
 
 namespace MongoDB
 {
@@ -338,5 +340,15 @@ namespace MongoDB
         /// <param name = "document">The document.</param>
         /// <param name = "safemode">if set to <c>true</c> [safemode].</param>
         void Save(object document, bool safemode);
+
+        /// <summary>
+        /// Creates an index
+        /// </summary>
+        /// <typeparam name="U"></typeparam>
+        /// <param name="index">The index expression</param>
+        /// <param name="indexName">The name of the Index</param>
+        /// <param name="isUnique">True if the index is unique, false otherwise</param>
+        /// <param name="direction">The direction of the index for multi-column indexes</param>
+        void CreateIndex<U>(Expression<Func<T, U>> index, string indexName, bool isUnique, IndexDirection direction);
     }
 }
\ No newline at end of file
diff --git a/source/MongoDB/MongoCollection_1.cs b/source/MongoDB/MongoCollection_1.cs
index 4944558..978904b 100644
--- a/source/MongoDB/MongoCollection_1.cs
+++ b/source/MongoDB/MongoCollection_1.cs
@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Linq.Expressions;
 using MongoDB.Configuration;
 using MongoDB.Connections;
 using MongoDB.Protocol;
@@ -556,6 +557,58 @@ namespace MongoDB
         }
 
         /// <summary>
+        /// Creates an index
+        /// </summary>
+        /// <typeparam name="U"></typeparam>
+        /// <param name="index">The index expression</param>
+        /// <param name="indexName">The name of the Index</param>
+        /// <param name="isUnique">True if the index is unique, false otherwise</param>
+        /// <param name="direction">The direction of the index for multi-column indexes</param>
+        public void CreateIndex<U>(Expression<Func<T, U>> index, string indexName, bool isUnique, IndexDirection direction)
+        {
+            var fieldsAndDirections = new Document();
+
+            // Build document from expression
+            var exp = index.Body as NewExpression;
+            if (exp != null)
+            {
+                foreach (var x in exp.Arguments.OfType<MemberExpression>())
+                {
+                    string alias = x.Member.Name;
+
+                    var classMap = _configuration.MappingStore.GetClassMap(x.Member.DeclaringType);
+                    if (classMap != null)
+                    {
+                        var memberMap = classMap.GetMemberMapFromMemberName(x.Member.Name);
+                        if (memberMap != null)
+                            alias = memberMap.Alias;
+                    }
+
+                    fieldsAndDirections[alias] = direction;
+                }
+            }
+
+            else if (index.Body is MemberExpression)
+            {
+                var me = index.Body as MemberExpression;
+                string alias = me.Member.Name;
+
+                var classMap = _configuration.MappingStore.GetClassMap(me.Member.DeclaringType);
+                if (classMap != null)
+                {
+                    var memberMap = classMap.GetMemberMapFromMemberName(me.Member.Name);
+                    if (memberMap != null)
+                        alias = memberMap.Alias;
+                }
+
+                fieldsAndDirections[alias] = direction;
+            }
+
+            // create the index
+            Metadata.CreateIndex(indexName, fieldsAndDirections, isUnique);
+        }
+
+        /// <summary>
         /// Checks the error.
         /// </summary>
         /// <param name="safemode">if set to <c>true</c> [safemode].</param>
diff --git a/source/MongoDB/MongoDB.csproj b/source/MongoDB/MongoDB.csproj
index 78f966c..61fbbac 100644
--- a/source/MongoDB/MongoDB.csproj
+++ b/source/MongoDB/MongoDB.csproj
@@ -144,6 +144,7 @@
     <Compile Include="MapReduce.cs" />
     <Compile Include="Commands\MapReduceCommand.cs" />
     <Compile Include="MongoRegexOption.cs" />
+    <Compile Include="Protocol\IndexDirection.cs" />
     <Compile Include="Results\MapReduceResult.cs" />
     <Compile Include="Serialization\Builders\DictionaryBuilder.cs" />
     <Compile Include="Serialization\Builders\PropertyDescriptor.cs" />
-- 
1.6.4.msysgit.0