Collection.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.Collection
//
// 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;
using System.Collections.Generic;
using System.Runtime.InteropServices;

namespace System.Collections.ObjectModel{
  [ComVisible (false)]
  [Serializable]
  public class Collection <T> : IList <T>, ICollection <T>, IEnumerable <T>, IList, ICollection, IEnumerable
  {
    IList <T> list;
    object syncRoot;
    
    public Collection ()
    {
      List <T> l = new List <T> ();
      IList l2 = l as IList;
      syncRoot = l2.SyncRoot;
      list = l;
    }

    public Collection (IList <T> list)
    {
      if (list == null)
        throw new ArgumentNullException ("list");
      this.list = list;
      ICollection l = list as ICollection;
      syncRoot = (l != null) ? l.SyncRoot : new object ();
    }

    public void Add (T item)
    {
      int idx = list.Count;
      InsertItem (idx, item);
    }

    public void Clear ()
    {
      ClearItems ();
    }

    protected virtual void ClearItems ()
    {
      list.Clear ();
    }

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

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

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

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

    public void Insert (int index, T item)
    {
      InsertItem (index, item);
    }

    protected virtual void InsertItem (int index, T item)
    {
      list.Insert (index, item);
    }

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

    public bool Remove (T item)
    {
      int idx = IndexOf (item);
      if (idx == -1) 
        return false;
      
      RemoveItem (idx);
      
      return true;
    }

    public void RemoveAt (int index)
    {
      RemoveItem (index);
    }

    protected virtual void RemoveItem (int index)
    {
      list.RemoveAt (index);
    }

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

    public T this [int index] {
      get { return list [index]; }
      set { SetItem (index, value); }
    }

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

    protected virtual void SetItem (int index, T item)
    {
      list[index] = item;
    }

    
#region Helper methods for non-generic interfaces
    
    internal static bool IsValidItem (object item)
    {
      return (item is T || (item == null && ! typeof (T).IsValueType));
    }
    
    internal static T ConvertItem (object item)
    {
      if (IsValidItem (item))
        return (T)item;
      throw new ArgumentException ("item");
    }
    
    internal static void CheckWritable (IList <T> list)
    {
      if (list.IsReadOnly)
        throw new NotSupportedException ();
    }
    
    internal static bool IsSynchronized (IList <T> list)
    {
      ICollection c = list as ICollection;
      return (c != null) ? c.IsSynchronized : false;
    }
    
    internal static bool IsFixedSize (IList <T> list)
    {
      IList l = list as IList;
      return (l != null) ? l.IsFixedSize : false;
    }
#endregion

#region Not generic interface implementations
    void ICollection.CopyTo (Array array, int index)
    {
      ((ICollection)list).CopyTo (array, index);
    }
    
    IEnumerator IEnumerable.GetEnumerator ()
    {
      return (IEnumerator) list.GetEnumerator ();
    }
        
    int IList.Add (object value)
    {
      int idx = list.Count;
      InsertItem (idx, ConvertItem (value));
      return idx;
    }
    
    bool IList.Contains (object value)
    {
      if (IsValidItem (value))
        return list.Contains ((T) value);
      return false;
    }
    
    int IList.IndexOf (object value)
    {
      if (IsValidItem (value))
        return list.IndexOf ((T) value);
      return -1;
    }
    
    void IList.Insert (int index, object value)
    {
      InsertItem (index, ConvertItem (value));
    }
    
    void IList.Remove (object value)
    {
      CheckWritable (list);

      int idx = IndexOf (ConvertItem (value));

      RemoveItem (idx);
    }
    
    bool ICollection.IsSynchronized {
      get { return IsSynchronized (list); }
    }
    
    object ICollection.SyncRoot {
      get { return syncRoot; }
    }
    bool IList.IsFixedSize {
      get { return IsFixedSize (list); }
    }
    
    bool IList.IsReadOnly {
      get { return list.IsReadOnly; }
    }
    
    object IList.this [int index] {
      get { return list [index]; }
      set { SetItem (index, ConvertItem (value)); }
    }
#endregion
  }
}