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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
namespace System.Data.Entity
{
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Linq.Expressions;
using System.Threading;
using System.Threading.Tasks;
/// <summary>
/// In-memory implementation of IDbSet based on a <see cref="HashSet" />
/// </summary>
/// <typeparam name="T"> Type of elements to be stored in the set </typeparam>
public class HashSetBasedDbSet<T> : IDbSet<T>
where T : class, new()
{
private readonly HashSet<T> _data;
private readonly IQueryable _query;
private readonly Func<IEnumerable<T>, T> _findFunc;
public HashSetBasedDbSet()
: this(null)
{
}
public HashSetBasedDbSet(Func<IEnumerable<T>, T> findFunc)
{
_data = new HashSet<T>();
_query = _data.AsQueryable();
_findFunc = findFunc;
}
public T Find(params object[] keyValues)
{
if (_findFunc == null)
{
throw new NotSupportedException("If you want to call find then use the constructor that specifies a find func.");
}
return _findFunc(_data);
}
public Task<T> FindAsync(CancellationToken cancellationToken, params object[] keyValues)
{
throw new NotImplementedException();
}
public T Add(T item)
{
_data.Add(item);
return item;
}
public T Remove(T item)
{
_data.Remove(item);
return item;
}
public T Attach(T item)
{
_data.Add(item);
return item;
}
Type IQueryable.ElementType
{
get { return _query.ElementType; }
}
Expression IQueryable.Expression
{
get { return _query.Expression; }
}
IQueryProvider IQueryable.Provider
{
get { return _query.Provider; }
}
IEnumerator IEnumerable.GetEnumerator()
{
return _data.GetEnumerator();
}
IEnumerator<T> IEnumerable<T>.GetEnumerator()
{
return _data.GetEnumerator();
}
public ObservableCollection<T> Local
{
get { return new ObservableCollection<T>(_data); }
}
public T Create()
{
return new T();
}
public TDerivedEntity Create<TDerivedEntity>() where TDerivedEntity : class, T
{
throw new NotImplementedException();
}
}
}
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