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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
//
// 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;
using System.Collections.Generic;
using System.Collections.ObjectModel;
namespace ICSharpCode.NRefactory
{
[Serializable]
public sealed class EmptyList<T> : IList<T>, IEnumerator<T>
#if NET45
, IReadOnlyList<T>
#endif
{
public static readonly EmptyList<T> Instance = new EmptyList<T>();
private EmptyList() {}
public T this[int index] {
get { throw new ArgumentOutOfRangeException("index"); }
set { throw new ArgumentOutOfRangeException("index"); }
}
public int Count {
get { return 0; }
}
bool ICollection<T>.IsReadOnly {
get { return true; }
}
int IList<T>.IndexOf(T item)
{
return -1;
}
void IList<T>.Insert(int index, T item)
{
throw new NotSupportedException();
}
void IList<T>.RemoveAt(int index)
{
throw new NotSupportedException();
}
void ICollection<T>.Add(T item)
{
throw new NotSupportedException();
}
void ICollection<T>.Clear()
{
}
bool ICollection<T>.Contains(T item)
{
return false;
}
void ICollection<T>.CopyTo(T[] array, int arrayIndex)
{
}
bool ICollection<T>.Remove(T item)
{
return false;
}
IEnumerator<T> IEnumerable<T>.GetEnumerator()
{
return this;
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()
{
return this;
}
T IEnumerator<T>.Current {
get { return default(T); }
}
object IEnumerator.Current {
get { return default(T); }
}
void IDisposable.Dispose()
{
}
bool IEnumerator.MoveNext()
{
return false;
}
void IEnumerator.Reset()
{
}
}
}
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