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IOrderedEnumerableSerializer.cs
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IOrderedEnumerableSerializer.cs
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/* Copyright 2010-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Represents a serializer for IOrderedEnumerable<typeparamref name="TItem"/>.
/// </summary>
/// <typeparam name="TItem">The type of the items.</typeparam>
public class IOrderedEnumerableSerializer<TItem> : SerializerBase<IOrderedEnumerable<TItem>>, IBsonArraySerializer
{
// private fields
private readonly IBsonSerializer<TItem> _itemSerializer;
private readonly string _thenByExceptionMessage;
// public constructors
/// <summary>
/// Initializes a new instance of IOrderedEnumerableSerializer.
/// </summary>
/// <param name="itemSerializer">The item serializer.</param>
/// <param name="thenByExceptionMessage">The message to use when throwing an exception because ThenBy is not supported.</param>
public IOrderedEnumerableSerializer(IBsonSerializer<TItem> itemSerializer, string thenByExceptionMessage)
{
_itemSerializer = itemSerializer ?? throw new ArgumentNullException(nameof(itemSerializer));
_thenByExceptionMessage = thenByExceptionMessage ?? throw new ArgumentNullException(nameof(thenByExceptionMessage));
}
// public methods
/// <inheritdoc/>
public override IOrderedEnumerable<TItem> Deserialize(BsonDeserializationContext context, BsonDeserializationArgs args)
{
var reader = context.Reader;
reader.ReadStartArray();
var list = new List<TItem>();
while (reader.ReadBsonType() != 0)
{
var item = _itemSerializer.Deserialize(context);
list.Add(item);
}
reader.ReadEndArray();
return new OrderedEnumerableListWrapper<TItem>(list, _thenByExceptionMessage);
}
/// <inheritdoc/>
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, IOrderedEnumerable<TItem> value)
{
var writer = context.Writer;
writer.WriteStartArray();
foreach (var item in value)
{
_itemSerializer.Serialize(context, item);
}
writer.WriteEndArray();
}
/// <inheritdoc/>
public bool TryGetItemSerializationInfo(out BsonSerializationInfo serializationInfo)
{
serializationInfo = new BsonSerializationInfo(null, _itemSerializer, typeof(TItem));
return true;
}
}
/// <summary>
/// A factory class for instances of IOrderedEnumerableSerializer<TItem>.
/// </summary>
public static class IOrderedEnumerableSerializer
{
/// <summary>
/// Creates an instance IOrderedEnumerableSerializer<TItem>.
/// </summary>
/// <param name="itemSerializer">The item serializer.</param>
/// <param name="thenByExceptionMessage">The message to use when throwing an exception because ThenBy is not supported.</param>
/// <returns>An IOrderedEnumerableSerializer<TItem>.</returns>
public static IBsonSerializer Create(IBsonSerializer itemSerializer, string thenByExceptionMessage)
{
if (itemSerializer == null) { throw new ArgumentNullException(nameof(itemSerializer)); }
var itemType = itemSerializer.ValueType;
var serializerType = typeof(IOrderedEnumerableSerializer<>).MakeGenericType(itemType);
return (IBsonSerializer)Activator.CreateInstance(serializerType, itemSerializer, thenByExceptionMessage);
}
}
internal class OrderedEnumerableListWrapper<T> : IOrderedEnumerable<T>
{
private readonly List<T> _list;
private readonly string _thenByExceptionMessage;
public OrderedEnumerableListWrapper(List<T> list, string thenByExceptionMessage)
{
_list = list;
_thenByExceptionMessage = thenByExceptionMessage;
}
public IOrderedEnumerable<T> CreateOrderedEnumerable<TKey>(Func<T, TKey> keySelector, IComparer<TKey> comparer, bool descending)
{
throw new InvalidOperationException(_thenByExceptionMessage);
}
public IEnumerator<T> GetEnumerator()
{
return _list.GetEnumerator();
}
IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
}
}