Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/UI/WebControls/XmlHierarchicalDataSourceView.cs

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+//------------------------------------------------------------------------------
+// <copyright file="XmlHierarchicalDataSourceView.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Web.UI.WebControls {
+
+    using System;
+    using System.Collections;
+    using System.ComponentModel;
+    using System.Data;
+    using System.Drawing.Design;
+    using System.Text;
+    using System.Web;
+    using System.Web.UI;
+    using System.Web.Util;
+    using System.Xml;
+
+
+
+    /// <devdoc>
+    /// Represents a hierarchical view of an XmlDataSource.
+    /// </devdoc>
+    public class XmlHierarchicalDataSourceView : HierarchicalDataSourceView {
+
+        private XmlDataSource _owner;
+        private string _viewPath;
+
+        /// <devdoc>
+        /// Creates a new instance of XmlHierarchicalDataSourceView.
+        /// </devdoc>
+        internal XmlHierarchicalDataSourceView(XmlDataSource owner, string viewPath) {
+            Debug.Assert(owner != null);
+            _owner = owner;
+            _viewPath = viewPath;
+        }
+
+
+
+        public override IHierarchicalEnumerable Select() {
+            XmlNode root = _owner.GetXmlDocument();
+
+            XmlNodeList nodes = null;
+            if (!String.IsNullOrEmpty(_viewPath)) {
+                XmlNode node = root.SelectSingleNode(_viewPath);
+                if (node != null) {
+                    nodes = node.ChildNodes;
+                }
+            }
+            else {
+                if (_owner.XPath.Length > 0) {
+                    nodes = root.SelectNodes(_owner.XPath);
+                }
+                else {
+                    nodes = root.ChildNodes;
+                }
+            }
+
+            return new XmlHierarchicalEnumerable(nodes);
+        }
+    }
+}
+