Expose ReadOnlyCollection

2 files changed, 100 insertions, 1 deletions

diff --git a/Mono.Collections.Generic/Collection.cs b/Mono.Collections.Generic/Collection.cs
index d7628f0..9177e39 100644
--- a/Mono.Collections.Generic/Collection.cs
+++ b/Mono.Collections.Generic/Collection.cs
@@ -237,7 +237,7 @@ namespace Mono.Collections.Generic {
 		{
 		}
 
-		void Grow (int desired)
+		internal virtual void Grow (int desired)
 		{
 			int new_size = size + desired;
 			if (new_size <= items.Length)
diff --git a/Mono.Collections.Generic/ReadOnlyCollection.cs b/Mono.Collections.Generic/ReadOnlyCollection.cs
new file mode 100644
index 0000000..61f6912
--- /dev/null
+++ b/Mono.Collections.Generic/ReadOnlyCollection.cs
@@ -0,0 +1,99 @@
+//
+// ReadOnlyCollection.cs
+//
+// Author:
+//   Jb Evain (jbevain@gmail.com)
+//
+// Copyright (c) 2008 - 2010 Jb Evain
+//
+// Permission is hereby granted, free of charge, to any person obtaining
+// a copy of this software and associated documentation files (the
+// "Software"), to deal in the Software without restriction, including
+// without limitation the rights to use, copy, modify, merge, publish,
+// distribute, sublicense, and/or sell copies of the Software, and to
+// permit persons to whom the Software is furnished to do so, subject to
+// the following conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+//
+
+using System;
+using System.Collections;
+
+namespace Mono.Collections.Generic {
+
+	public sealed class ReadOnlyCollection<T> : Collection<T>, IList {
+
+		static ReadOnlyCollection<T> empty;
+
+		public static ReadOnlyCollection<T> Empty {
+			get { return empty ?? (empty = new ReadOnlyCollection<T> ()); }
+		}
+
+		readonly bool initialized;
+
+		bool IList.IsReadOnly {
+			get { return true; }
+		}
+
+		public ReadOnlyCollection ()
+		{
+			initialized = true;
+		}
+
+		public ReadOnlyCollection (T [] array)
+			: this ()
+		{
+			this.items = array;
+			this.size = array.Length;
+		}
+
+		public ReadOnlyCollection (Collection<T> collection)
+			: this ()
+		{
+			this.items = collection.items;
+			this.size = collection.size;
+		}
+
+		internal override void Grow (int desired)
+		{
+			if (initialized)
+				throw new InvalidOperationException ();
+		}
+
+		protected override void OnAdd (T item, int index)
+		{
+			if (initialized)
+				throw new InvalidOperationException ();
+		}
+
+		protected override void OnClear ()
+		{
+			throw new InvalidOperationException ();
+		}
+
+		protected override void OnInsert (T item, int index)
+		{
+			throw new InvalidOperationException ();
+		}
+
+		protected override void OnRemove (T item, int index)
+		{
+			throw new InvalidOperationException ();
+		}
+
+		protected override void OnSet (T item, int index)
+		{
+			throw new InvalidOperationException ();
+		}
+	}
+}