105 lines
3.8 KiB
C#
105 lines
3.8 KiB
C#
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//
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// CollectionFromEnumerable.cs
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//
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// Author:
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// Leszek Ciesielski (skolima@gmail.com)
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//
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// (C) 2011 Leszek Ciesielski
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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namespace Microsoft.Build.Internal
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{
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internal class CollectionFromEnumerable<T> : ICollection<T>
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{
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IEnumerable<T> backingEnumerable;
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public CollectionFromEnumerable (IEnumerable<T> enumerable)
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{
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backingEnumerable = enumerable;
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}
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public void Add (T item)
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{
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throw new InvalidOperationException ("This collection is read-only.");
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}
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public void Clear ()
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{
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throw new InvalidOperationException ("This collection is read-only.");
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}
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public bool Contains (T item)
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{
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List<T> backingList = backingEnumerable as List<T>;
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if (backingList != null)
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return backingList.Contains (item);
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return backingEnumerable.Contains (item);
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}
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public void CopyTo (T[] array, int arrayIndex)
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{
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List<T> backingList = backingEnumerable as List<T>;
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if (backingList != null) {
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backingList.CopyTo (array, arrayIndex);
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return;
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}
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int i = arrayIndex;
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foreach (var item in backingEnumerable) {
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array[i++] = item;
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}
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}
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public int Count {
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get {
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var backingList = backingEnumerable as List<T>;
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if(backingList == null)
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backingEnumerable = backingList = new List<T> (backingEnumerable);
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return backingList.Count;
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}
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}
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public bool IsReadOnly {
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get { return true; }
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}
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public bool Remove (T item)
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{
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throw new InvalidOperationException ("This collection is read-only.");
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}
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public IEnumerator<T> GetEnumerator ()
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{
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return backingEnumerable.GetEnumerator ();
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}
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System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator ()
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{
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return backingEnumerable.GetEnumerator ();
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}
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}
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}
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