99 lines
2.4 KiB
C#
99 lines
2.4 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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{
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public sealed class ReadOnlyCollection<T> : Collection<T>, ICollection<T>, IList
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{
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private static ReadOnlyCollection<T> empty;
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public static ReadOnlyCollection<T> Empty
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{
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get
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{
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if (empty != null)
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return empty;
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Interlocked.CompareExchange(ref empty, new(), 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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{
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get { return true; }
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}
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bool IList.IsFixedSize
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{
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get { return true; }
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}
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bool IList.IsReadOnly
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{
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get { return true; }
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}
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private ReadOnlyCollection() { }
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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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private 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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} |