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//----------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------
namespace System.IdentityModel
{
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
//
// A collection that can be made immutable by calling the
// MakeReadOnly method. Once the collection is made read-only
// Add, Remove and Clear methods will throw an exception
// failing to add a item to the collection.
//
internal sealed class ImmutableCollection<T> : Collection<T>, IList<T>, IList
{
bool isReadOnly = false;
public void MakeReadOnly()
{
this.isReadOnly = true;
}
public bool IsReadOnly
{
get { return this.isReadOnly; }
}
protected override void ClearItems()
{
if (this.isReadOnly)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));
base.ClearItems();
}
protected override void InsertItem(int index, T item)
{
if (this.isReadOnly)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));
base.InsertItem(index, item);
}
protected override void RemoveItem(int index)
{
if (this.isReadOnly)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));
base.RemoveItem(index);
}
protected override void SetItem(int index, T item)
{
if (this.isReadOnly)
throw DiagnosticUtility.ExceptionUtility.ThrowHelperError(new InvalidOperationException(SR.GetString(SR.ObjectIsReadOnly)));
base.SetItem(index, item);
}
bool ICollection<T>.IsReadOnly
{
get { return this.isReadOnly; }
}
bool IList.IsReadOnly
{
get { return this.isReadOnly; }
}
}
}
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