2008-05-01 Jb Evain <jbevain@novell.com>

	* SortDirection.cs, SortContext.cs, SortSequenceContext.cs:
	new infrastructure files for nested orderby/thenby calls.
	* QuickSort.cs: refactored out of OrderedSequence.cs
	* OrderedEnumerable.cs, OrderedSequence.cs: refactoring
	to use the new SortContext infrastructure.

svn path=/trunk/mcs/; revision=102297

1 files changed, 46 insertions, 0 deletions

diff --git a/mcs/class/System.Core/System.Linq/SortContext.cs b/mcs/class/System.Core/System.Linq/SortContext.cs
new file mode 100644
index 00000000000..1485117c16b
--- /dev/null
+++ b/mcs/class/System.Core/System.Linq/SortContext.cs
@@ -0,0 +1,46 @@
+//
+// SortContext.cs
+//
+// Author:
+//   Jb Evain (jbevain@novell.com)
+//
+// (C) 2008 Novell, Inc. (http://www.novell.com)
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+namespace System.Linq {
+
+	abstract class SortContext<TElement> {
+
+		protected SortDirection direction;
+		protected SortContext<TElement> child_context;
+
+		protected SortContext (SortDirection direction, SortContext<TElement> child_context)
+		{
+			this.direction = direction;
+			this.child_context = child_context;
+		}
+
+		public abstract void Initialize (TElement [] elements);
+
+		public abstract int Compare (int first_index, int second_index);
+	}
+}