102 lines
1.9 KiB
C#
102 lines
1.9 KiB
C#
//
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// Author:
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// Jb Evain (jbevain@gmail.com)
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//
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// Copyright (c) 2008 - 2015 Jb Evain
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// Copyright (c) 2008 - 2011 Novell, Inc.
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//
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// Licensed under the MIT/X11 license.
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//
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Threading;
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namespace MonoFN.Collections.Generic {
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public sealed class ReadOnlyCollection<T> : Collection<T>, ICollection<T>, IList {
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static ReadOnlyCollection<T> empty;
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public static ReadOnlyCollection<T> Empty {
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get {
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if (empty != null)
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return empty;
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Interlocked.CompareExchange (ref empty, new ReadOnlyCollection<T> (), null);
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return empty;
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}
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}
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bool ICollection<T>.IsReadOnly {
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get { return true; }
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}
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bool IList.IsFixedSize {
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get { return true; }
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}
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bool IList.IsReadOnly {
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get { return true; }
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}
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ReadOnlyCollection ()
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{
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}
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public ReadOnlyCollection (T [] array)
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{
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if (array == null)
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throw new ArgumentNullException ();
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Initialize (array, array.Length);
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}
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public ReadOnlyCollection (Collection<T> collection)
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{
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if (collection == null)
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throw new ArgumentNullException ();
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Initialize (collection.items, collection.size);
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}
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void Initialize (T [] items, int size)
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{
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this.items = new T [size];
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Array.Copy (items, 0, this.items, 0, size);
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this.size = size;
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}
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internal override void Grow (int desired)
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{
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throw new InvalidOperationException ();
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}
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protected override void OnAdd (T item, int index)
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{
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throw new InvalidOperationException ();
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}
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protected override void OnClear ()
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{
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throw new InvalidOperationException ();
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}
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protected override void OnInsert (T item, int index)
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{
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throw new InvalidOperationException ();
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}
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protected override void OnRemove (T item, int index)
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{
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throw new InvalidOperationException ();
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}
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protected override void OnSet (T item, int index)
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{
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throw new InvalidOperationException ();
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}
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}
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}
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