Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.IdentityModel/System/IdentityModel/Tokens/Saml2ProxyRestriction.cs

@@ -0,0 +1,62 @@
+//-----------------------------------------------------------------------
+// <copyright file="Saml2ProxyRestriction.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//-----------------------------------------------------------------------
+
+namespace System.IdentityModel.Tokens
+{
+    using System;
+    using System.Collections.ObjectModel;
+
+    /// <summary>
+    /// Represents the ProxyRestriction element specified in [Saml2Core, 2.5.1.6].
+    /// </summary>
+    public class Saml2ProxyRestriction
+    {
+        private Collection<Uri> audiences = new AbsoluteUriCollection();
+        private int? count;
+
+        /// <summary>
+        /// Initializes an instance of <see cref="Saml2ProxyRestriction"/>.
+        /// </summary>
+        public Saml2ProxyRestriction()
+        {
+        }
+
+        /// <summary>
+        /// Gets the set of audiences to whom the asserting party permits
+        /// new assertions to be issued on the basis of this assertion.
+        /// </summary>
+        public Collection<Uri> Audiences
+        {
+            get { return this.audiences; }
+        }
+
+        /// <summary>
+        /// Gets or sets the maximum number of indirections that the asserting party
+        /// permits to exist between this assertion and an assertion which has 
+        /// ultimately been issued on the basis of it.
+        /// </summary>
+        public int? Count
+        {
+            get
+            { 
+                return this.count; 
+            }
+
+            set
+            {
+                if (null != value)
+                {
+                    if (value.Value < 0)
+                    {
+                        throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new ArgumentOutOfRangeException("value", SR.GetString(SR.ID0002)));
+                    }
+                }
+
+                this.count = value;
+            }
+        }
+    }
+}