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