ReadOnlyCollection.cs :  » 2.6.4-mono-.net-core » System.Collections » System » Collections » ObjectModel » C# / CSharp Open Source

// -*- Mode: csharp; tab-width: 8; indent-tabs-mode: t; c-basic-offset: 8 -*-
//
// System.Collections.ObjectModel.ReadOnlyCollection
//
// Author:
//    Zoltan Varga (vargaz@gmail.com)
//    David Waite (mass@akuma.org)
//
// (C) 2005 Novell, Inc.
// (C) 2005 David Waite
//

//
// Copyright (C) 2005 Novell, Inc (http://www.novell.com)
// Copyright (C) 2005 David Waite
//
// 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.Runtime.InteropServices;

namespace System.Collections.ObjectModel{
  [ComVisible (false)]
  [Serializable]
  public class ReadOnlyCollection <T> : IList <T>, ICollection <T>, IEnumerable <T>, IList, ICollection, IEnumerable
  {
    IList <T> list;
    
    public ReadOnlyCollection (IList <T> list)
    {
      if (list == null)
        throw new ArgumentNullException ("list");
      this.list = list;
    }

    void ICollection<T>.Add (T item)
    {
      throw new NotSupportedException ();
    }
    
    void ICollection<T>.Clear ()
    {
      throw new NotSupportedException ();
    }

    public bool Contains (T value)
    {
      return list.Contains (value);
    }

    public void CopyTo (T [] array, int index)
    {
      list.CopyTo (array, index);
    }

    public IEnumerator <T> GetEnumerator ()
    {
      return list.GetEnumerator ();
    }

    public int IndexOf (T value)
    {
      return list.IndexOf (value);
    }

    void IList<T>.Insert (int index, T item)
    {
      throw new NotSupportedException ();
    }

    bool ICollection<T>.Remove (T item)
    {
      throw new NotSupportedException ();
    }

    void IList<T>.RemoveAt (int index)
    {
      throw new NotSupportedException ();
    }

    public int Count {
      get { return list.Count; }
    }

    protected IList<T> Items {
      get { return list; }
    }

    public T this [int index] {
      get { return list [index]; }
    }

    T IList<T>.this [int index] {
      get { return this [index]; }
      set { throw new NotSupportedException (); }
    }

    bool ICollection<T>.IsReadOnly {
      get { return true; }
    }

#region Not generic interface implementations
    void ICollection.CopyTo (Array array, int index)
    {
      ((ICollection)list).CopyTo (array, index);
    }
        
    IEnumerator IEnumerable.GetEnumerator ()
    {
      return ((IEnumerable) list).GetEnumerator ();
    }
    
    int IList.Add (object value)
    {
      throw new NotSupportedException ();
    }
    
    void IList.Clear ()
    {
      throw new NotSupportedException ();
    }

    bool IList.Contains (object value)
    {
      if (Collection <T>.IsValidItem (value))
        return list.Contains ((T) value);
      return false;
    }
    
    int IList.IndexOf (object value)
    {
      if (Collection <T>.IsValidItem (value))
        return list.IndexOf ((T) value);
      return -1;
    }
    
    void IList.Insert (int index, object value)
    {
      throw new NotSupportedException ();
    }
    
    void IList.Remove (object value)
    {
      throw new NotSupportedException ();
    }
    
    void IList.RemoveAt (int index)
    {
      throw new NotSupportedException ();
    }

    bool ICollection.IsSynchronized {
      get { return false; }
    }
    
    object ICollection.SyncRoot {
      get { return this; }
    }

    bool IList.IsFixedSize {
      get { return true; }
    }
    
    bool IList.IsReadOnly {
      get { return true; }
    }
    
    object IList.this [int index] {
      get { return list [index]; }
      set { throw new NotSupportedException (); }
    }
#endregion
  }
}