Merge pull request #2 from phirSOFT/AccumulatedTopologicalComparer

AccumulatedTopologicalComparer

phirSOFT.ConstraintedComparison/AccumulatedTopologicalComparer.cs

@@ -0,0 +1,30 @@
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using System.Linq;
+
+
+namespace phirSOFT.TopologicalComparison
+{
+    /// <inheritdoc cref="ITopologicalComparer{T}"/>
+    /// <summary>
+    /// A topological comparer that wraps multiple <see cref="ITopologicalComparer{T}"/> into one.
+    /// </summary>
+    /// <typeparam name="T">The type to compare</typeparam>
+    /// <remarks>
+    /// The comparers are applied in ascending index order.
+    /// </remarks>
+    public class  AccumulatedTopologicalComparer<T> : Collection<ITopologicalComparer<T>>, ITopologicalComparer<T>
+    {
+        /// <inheritdoc cref="IComparer{T}.Compare"/>
+        public int Compare(T x, T y)
+        {
+            return this.First(item => item.CanCompare(x, y)).Compare(x, y);
+        }
+
+        /// <inheritdoc cref="ITopologicalComparer{T}.CanCompare"/>
+        public bool CanCompare(T x, T y)
+        {
+            return this.Any(item => item.CanCompare(x, y));
+        }
+    }
+}