source: branches/2893_BNLR/HeuristicLab.ExtLibs/HeuristicLab.Cecil/0.9.5/Mono.Cecil-0.9.5/Mono.Cecil/Mono.Collections.Generic/ReadOnlyCollection.cs

//
// ReadOnlyCollection.cs
//
// Author:
//   Jb Evain (jbevain@gmail.com)
//
// Copyright (c) 2008 - 2011 Jb Evain
//
// 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;

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 ();
    }
  }
}