1 files changed, 57 insertions, 0 deletions
diff --git a/LibGit2Sharp/FollowFilter.cs b/LibGit2Sharp/FollowFilter.cs
new file mode 100644
index 00000000..7bd60708
--- /dev/null
+++ b/LibGit2Sharp/FollowFilter.cs
@@ -0,0 +1,57 @@
+using System;
+using System.Collections.Generic;
+
+namespace LibGit2Sharp
+{
+    /// <summary>
+    /// Criteria used to order the commits of the repository when querying its history.
+    /// <para>
+    /// The commits will be enumerated from the current HEAD of the repository.
+    /// </para>
+    /// </summary>
+    public sealed class FollowFilter
+    {
+        private static readonly List<CommitSortStrategies> AllowedSortStrategies = new List<CommitSortStrategies>
+        {
+            CommitSortStrategies.Topological,
+            CommitSortStrategies.Time,
+            CommitSortStrategies.Topological | CommitSortStrategies.Time
+        };
+
+        private CommitSortStrategies _sortBy;
+
+        /// <summary>
+        /// Initializes a new instance of <see cref="FollowFilter" />.
+        /// </summary>
+        public FollowFilter()
+        {
+            SortBy = CommitSortStrategies.Time;
+        }
+
+        /// <summary>
+        /// The ordering strategy to use.
+        /// <para>
+        /// By default, the commits are shown in reverse chronological order.
+        /// </para>
+        /// <para>
+        /// Only 'Topological', 'Time', or 'Topological | Time' are allowed.
+        /// </para>
+        /// </summary>
+        public CommitSortStrategies SortBy
+        {
+            get { return _sortBy; }
+
+            set
+            {
+                if (!AllowedSortStrategies.Contains(value))
+                {
+                    throw new ArgumentException(
+                        "Unsupported sort strategy. Only 'Topological', 'Time', or 'Topological | Time' are allowed.",
+                        "value");
+                }
+
+                _sortBy = value;
+            }
+        }
+    }
+}