Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Data.SqlXml/System/Xml/Xsl/XsltOld/NamespaceEvent.cs

@@ -0,0 +1,47 @@
+//------------------------------------------------------------------------------
+// <copyright file="NameSpaceEvent.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+// <owner current="true" primary="true">[....]</owner>
+//------------------------------------------------------------------------------
+
+namespace System.Xml.Xsl.XsltOld {
+    using Res = System.Xml.Utils.Res;
+    using System;
+    using System.Diagnostics;
+    using System.Xml;
+    using System.Xml.XPath;
+
+    internal class NamespaceEvent : Event {
+        private string namespaceUri;
+        private string name;
+        
+        public NamespaceEvent(NavigatorInput input) {
+            Debug.Assert(input != null);
+            Debug.Assert(input.NodeType == XPathNodeType.Namespace);
+            this.namespaceUri = input.Value;
+            this.name         = input.LocalName;
+        }
+
+        public override void ReplaceNamespaceAlias(Compiler compiler){
+            if (this.namespaceUri.Length != 0) { // Do we need to check this for namespace?
+                NamespaceInfo ResultURIInfo = compiler.FindNamespaceAlias(this.namespaceUri);
+                if (ResultURIInfo != null) {
+                    this.namespaceUri = ResultURIInfo.nameSpace;
+                    if (ResultURIInfo.prefix != null) {
+                        this.name = ResultURIInfo.prefix;
+                    }
+                }
+            }
+        }
+        
+        public override bool Output(Processor processor, ActionFrame frame) {
+            bool res;
+            res = processor.BeginEvent(XPathNodeType.Namespace, /*prefix:*/null, this.name, this.namespaceUri, /*empty:*/false);
+            Debug.Assert(res); // Namespace node as any other attribute can't fail because it doesn't signal record change
+            res = processor.EndEvent(XPathNodeType.Namespace);
+            Debug.Assert(res);
+            return true;
+        }
+    }
+}