Remove OData specific functions

Author: irvinesunday

src/Microsoft.OpenApi/Services/OpenApiUrlTreeNode.cs

@@ -63,11 +63,11 @@ private OpenApiUrlTreeNode(string segment)
         /// <summary>
         /// Creates a structured directory of <see cref="OpenApiUrlTreeNode"/> nodes from the paths of an OpenAPI document.
         /// </summary>
-        /// <param name="doc">The OpenAPI document.</param>
-        /// <param name="label">Name tag for labelling the <see cref="OpenApiUrlTreeNode"/> nodes
+        /// <param name="doc">Optional. The OpenAPI document.</param>
+        /// <param name="label">Optional. Name tag for labelling the <see cref="OpenApiUrlTreeNode"/> nodes
         /// in the directory structure.</param>
         /// <returns>The root node of the created <see cref="OpenApiUrlTreeNode"/> directory structure.</returns>
-        public static OpenApiUrlTreeNode Create(OpenApiDocument doc, string label = "")
+        public static OpenApiUrlTreeNode Create(OpenApiDocument doc = null, string label = "")
         {
             OpenApiUrlTreeNode root = new OpenApiUrlTreeNode(string.Empty);
 
@@ -144,7 +144,7 @@ private OpenApiUrlTreeNode Attach(IEnumerable<string> segments, OpenApiPathItem
             // If the child segment has already been defined, then insert into it
             if (Children.ContainsKey(segment))
             {
-                return Children[segment].Attach(segments.Skip(1), pathItem, label, currentPath + "\\" + segment );
+                return Children[segment].Attach(segments.Skip(1), pathItem, label, currentPath + "\\" + segment);
             }
             else
             {

test/Microsoft.OpenApi.Tests/Services/OpenApiUrlTreeNodeTests.cs

@@ -1,22 +1,17 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT license.
 
-using System.Collections.Generic;
-using Microsoft.OpenApi.Models;
-using Microsoft.OpenApi.Services;
-using Xunit;
-
 namespace Microsoft.OpenApi.Tests.Services
 {
     public class OpenApiUrlTreeNodeTests
     {
         [Fact]
-        public void CreateEmptyUrlTreeNode()
+        public void CreateUrlSpaceWithEmptyAndNullOpenApiDocument()
         {
             var doc = new OpenApiDocument() { };
 
             var rootNode = OpenApiUrlTreeNode.Create(doc);
-            var rootNode1 = OpenApiUrlTreeNode.Create(null);
+            var rootNode1 = OpenApiUrlTreeNode.Create();
 
             Assert.NotNull(rootNode);
             Assert.NotNull(rootNode1);