Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web/Util/SingleObjectCollection.cs

@@ -0,0 +1,53 @@
+//------------------------------------------------------------------------------
+// <copyright file="SingleObjectCollection.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>                                                                
+//------------------------------------------------------------------------------
+
+/*
+ * SingleObjectCollection class
+ * 
+ * Copyright (c) 1999 Microsoft Corporation
+ */
+
+namespace System.Web.Util {
+
+using System.Collections;
+
+/*
+ * Fast implementation of a collection with a single object
+ */
+internal class SingleObjectCollection: ICollection {
+
+    private class SingleObjectEnumerator: IEnumerator {
+        private object _object;
+        private bool done;
+
+        public SingleObjectEnumerator(object o) { _object = o; }
+        public object Current { get { return _object; } }
+        public bool MoveNext() {
+            if (!done) {
+                done = true;
+                return true;
+            }
+
+            return false;
+        }
+        public void Reset() { done = false; }
+    }
+
+    private object _object;
+
+    public SingleObjectCollection(object o) { _object = o; }
+
+    IEnumerator IEnumerable.GetEnumerator() { return new SingleObjectEnumerator(_object); }
+    public int Count { get { return 1; } }
+    bool ICollection.IsSynchronized { get { return true; } }
+    object ICollection.SyncRoot { get { return this; } }
+
+    public void CopyTo(Array array, int index) {
+        array.SetValue(_object, index);
+    }
+}
+
+}