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//
// CollectionFromEnumerable.cs
//
// Author:
// Leszek Ciesielski (skolima@gmail.com)
//
// (C) 2011 Leszek Ciesielski
//
// 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.Generic;
using System.Linq;
using System.Text;
namespace Microsoft.Build.Internal
{
internal class CollectionFromEnumerable<T> : ICollection<T>
{
IEnumerable<T> backingEnumerable;
public CollectionFromEnumerable (IEnumerable<T> enumerable)
{
backingEnumerable = enumerable;
}
public void Add (T item)
{
throw new InvalidOperationException ("This collection is read-only.");
}
public void Clear ()
{
throw new InvalidOperationException ("This collection is read-only.");
}
public bool Contains (T item)
{
List<T> backingList = backingEnumerable as List<T>;
if (backingList != null)
return backingList.Contains (item);
return backingEnumerable.Contains (item);
}
public void CopyTo (T[] array, int arrayIndex)
{
List<T> backingList = backingEnumerable as List<T>;
if (backingList != null) {
backingList.CopyTo (array, arrayIndex);
return;
}
int i = arrayIndex;
foreach (var item in backingEnumerable) {
array[i++] = item;
}
}
public int Count {
get {
var backingList = backingEnumerable as List<T>;
if(backingList == null)
backingEnumerable = backingList = new List<T> (backingEnumerable);
return backingList.Count;
}
}
public bool IsReadOnly {
get { return true; }
}
public bool Remove (T item)
{
throw new InvalidOperationException ("This collection is read-only.");
}
public IEnumerator<T> GetEnumerator ()
{
return backingEnumerable.GetEnumerator ();
}
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()
{
return backingEnumerable.GetEnumerator ();
}
}
}
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