Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.IdentityModel/System/IdentityModel/Tokens/AbsoluteUriCollection.cs

@@ -0,0 +1,41 @@
+//-----------------------------------------------------------------------
+// <copyright file="AbsoluteUriCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace System.IdentityModel.Tokens
+{
+    using System;
+    using System.Collections.ObjectModel;
+
+    /// <summary>
+    /// A collection of absolute URIs.
+    /// </summary>
+    internal class AbsoluteUriCollection : Collection<Uri>
+    {
+        public AbsoluteUriCollection()
+        {
+        }
+
+        protected override void InsertItem(int index, Uri item)
+        {
+            if (null == item || !item.IsAbsoluteUri)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument("item", SR.GetString(SR.ID0013));
+            }
+            
+            base.InsertItem(index, item);
+        }
+
+        protected override void SetItem(int index, Uri item)
+        {
+            if (null == item || !item.IsAbsoluteUri)
+            {
+                throw DiagnosticUtility.ExceptionUtility.ThrowHelperArgument("item", SR.GetString(SR.ID0013));
+            }
+
+            base.SetItem(index, item);
+        }
+    }
+}