Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/Channels/UriGenerator.cs

@@ -0,0 +1,42 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.ServiceModel.Channels
+{
+    using System.Threading;
+    using System.Globalization;
+
+    class UriGenerator
+    {
+        long id;
+        string prefix;
+
+        public UriGenerator()
+            : this("uuid")
+        {
+        }
+
+        public UriGenerator(string scheme)
+            : this(scheme, ";")
+        {
+        }
+
+        public UriGenerator(string scheme, string delimiter)
+        {
+            if (scheme == null)
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentNullException("scheme"));
+
+            if (scheme.Length == 0)
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentException(SR.GetString(SR.UriGeneratorSchemeMustNotBeEmpty), "scheme"));
+
+            prefix = string.Concat(scheme, ":", Guid.NewGuid().ToString(), delimiter, "id=");
+        }
+
+        public string Next()
+        {
+            long nextId = Interlocked.Increment(ref id);
+            return prefix + nextId.ToString(CultureInfo.InvariantCulture);
+        }
+    }
+}