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// -----------------------------------------------------------------------
// Copyright (c) Microsoft Corporation. All rights reserved.
// -----------------------------------------------------------------------
using System;
using System.Collections;
using System.Collections.Generic;
using System.Reflection;
namespace Microsoft.Internal.Collections
{
internal static partial class CollectionServices
{
public static ICollection<object> GetCollectionWrapper(Type itemType, object collectionObject)
{
Assumes.NotNull(itemType, collectionObject);
if (itemType == typeof(object))
{
return (ICollection<object>)collectionObject;
}
// Most common .Net collections implement IList as well so for those
// cases we can optimize the wrapping instead of using reflection to create
// a generic type.
if (typeof(IList).IsAssignableFrom(collectionObject.GetType()))
{
return new CollectionOfObjectList((IList)collectionObject);
}
Type collectionType = typeof(CollectionOfObject<>).MakeGenericType(itemType);
return (ICollection<object>)Activator.CreateInstance(collectionType, collectionObject);
}
private class CollectionOfObjectList : ICollection<object>
{
private readonly IList _list;
public CollectionOfObjectList(IList list)
{
this._list = list;
}
public void Add(object item)
{
this._list.Add(item);
}
public void Clear()
{
this._list.Clear();
}
public bool Contains(object item)
{
return Assumes.NotReachable<bool>();
}
public void CopyTo(object[] array, int arrayIndex)
{
Assumes.NotReachable<object>();
}
public int Count
{
get { return Assumes.NotReachable<int>(); }
}
public bool IsReadOnly
{
get { return this._list.IsReadOnly; }
}
public bool Remove(object item)
{
return Assumes.NotReachable<bool>();
}
public IEnumerator<object> GetEnumerator()
{
return Assumes.NotReachable<IEnumerator<object>>();
}
IEnumerator IEnumerable.GetEnumerator()
{
return Assumes.NotReachable<IEnumerator>();
}
}
private class CollectionOfObject<T> : ICollection<object>
{
private readonly ICollection<T> _collectionOfT;
public CollectionOfObject(object collectionOfT)
{
this._collectionOfT = (ICollection<T>)collectionOfT;
}
public void Add(object item)
{
this._collectionOfT.Add((T) item);
}
public void Clear()
{
this._collectionOfT.Clear();
}
public bool Contains(object item)
{
return Assumes.NotReachable<bool>();
}
public void CopyTo(object[] array, int arrayIndex)
{
Assumes.NotReachable<object>();
}
public int Count
{
get { return Assumes.NotReachable<int>(); }
}
public bool IsReadOnly
{
get { return this._collectionOfT.IsReadOnly; }
}
public bool Remove(object item)
{
return Assumes.NotReachable<bool>();
}
public IEnumerator<object> GetEnumerator()
{
return Assumes.NotReachable<IEnumerator<object>>();
}
IEnumerator IEnumerable.GetEnumerator()
{
return Assumes.NotReachable<IEnumerator>();
}
}
}
}
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