1 files changed, 73 insertions, 0 deletions

diff --git a/src/WixToolset.Core/Link/WixComplexReferenceTupleExtensions.cs b/src/WixToolset.Core/Link/WixComplexReferenceTupleExtensions.cs
new file mode 100644
index 00000000..80cafa50
--- /dev/null
+++ b/src/WixToolset.Core/Link/WixComplexReferenceTupleExtensions.cs
@@ -0,0 +1,73 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+
+namespace WixToolset.Core.Link
+{
+    using System;
+    using WixToolset.Data.Tuples;
+
+    internal static class WixComplexReferenceTupleExtensions
+    {
+        /// <summary>
+        /// Creates a shallow copy of the ComplexReference.
+        /// </summary>
+        /// <returns>A shallow copy of the ComplexReference.</returns>
+        public static WixComplexReferenceTuple Clone(this WixComplexReferenceTuple source)
+        {
+            var clone = new WixComplexReferenceTuple(source.SourceLineNumbers, source.Id);
+            clone.ParentType = source.ParentType;
+            clone.Parent = source.Parent;
+            clone.ParentLanguage = source.ParentLanguage;
+            clone.ChildType = source.ChildType;
+            clone.Child = source.Child;
+            clone.IsPrimary = source.IsPrimary;
+
+            return clone;
+        }
+
+        /// <summary>
+        /// Compares two complex references without considering the primary bit.
+        /// </summary>
+        /// <param name="obj">Complex reference to compare to.</param>
+        /// <returns>Zero if the objects are equivalent, negative number if the provided object is less, positive if greater.</returns>
+        public static int CompareToWithoutConsideringPrimary(this WixComplexReferenceTuple tuple, WixComplexReferenceTuple other)
+        {
+            var comparison = tuple.ChildType - other.ChildType;
+            if (0 == comparison)
+            {
+                comparison = String.Compare(tuple.Child, other.Child, StringComparison.Ordinal);
+                if (0 == comparison)
+                {
+                    comparison = tuple.ParentType - other.ParentType;
+                    if (0 == comparison)
+                    {
+                        string thisParentLanguage = null == tuple.ParentLanguage ? String.Empty : tuple.ParentLanguage;
+                        string otherParentLanguage = null == other.ParentLanguage ? String.Empty : other.ParentLanguage;
+                        comparison = String.Compare(thisParentLanguage, otherParentLanguage, StringComparison.Ordinal);
+                        if (0 == comparison)
+                        {
+                            comparison = String.Compare(tuple.Parent, other.Parent, StringComparison.Ordinal);
+                        }
+                    }
+                }
+            }
+
+            return comparison;
+        }
+
+        /// <summary>
+        /// Changes all of the parent references to point to the passed in parent reference.
+        /// </summary>
+        /// <param name="parent">New parent complex reference.</param>
+        public static void Reparent(this WixComplexReferenceTuple tuple, WixComplexReferenceTuple parent)
+        {
+            tuple.Parent = parent.Parent;
+            tuple.ParentLanguage = parent.ParentLanguage;
+            tuple.ParentType = parent.ParentType;
+
+            if (!tuple.IsPrimary)
+            {
+                tuple.IsPrimary = parent.IsPrimary;
+            }
+        }
+    }
+}