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EnumerableInterfaceImplementerSerializer.cs
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EnumerableInterfaceImplementerSerializer.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.Reflection;
namespace MongoDB.Bson.Serialization.Serializers
{
/// <summary>
/// Represents a serializer for a class that implements IEnumerable.
/// </summary>
/// <typeparam name="TValue">The type of the value.</typeparam>
public class EnumerableInterfaceImplementerSerializer<TValue> :
EnumerableInterfaceImplementerSerializerBase<TValue>,
IChildSerializerConfigurable
where TValue : class, IList, new()
{
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="EnumerableInterfaceImplementerSerializer{TValue}"/> class.
/// </summary>
public EnumerableInterfaceImplementerSerializer()
{
}
/// <summary>
/// Initializes a new instance of the <see cref="EnumerableInterfaceImplementerSerializer{TValue}"/> class.
/// </summary>
/// <param name="itemSerializer">The item serializer.</param>
public EnumerableInterfaceImplementerSerializer(IBsonSerializer itemSerializer)
: base(itemSerializer)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="EnumerableInterfaceImplementerSerializer{TValue}" /> class.
/// </summary>
/// <param name="serializerRegistry">The serializer registry.</param>
public EnumerableInterfaceImplementerSerializer(IBsonSerializerRegistry serializerRegistry)
: base(serializerRegistry)
{
}
// public methods
/// <summary>
/// Returns a serializer that has been reconfigured with the specified item serializer.
/// </summary>
/// <param name="itemSerializer">The item serializer.</param>
/// <returns>The reconfigured serializer.</returns>
public EnumerableInterfaceImplementerSerializer<TValue> WithItemSerializer(IBsonSerializer itemSerializer)
{
return new EnumerableInterfaceImplementerSerializer<TValue>(itemSerializer);
}
// protected methods
/// <summary>
/// Creates the accumulator.
/// </summary>
/// <returns>The accumulator.</returns>
protected override object CreateAccumulator()
{
return new TValue();
}
// explicit interface implementations
IBsonSerializer IChildSerializerConfigurable.ChildSerializer
{
get { return ItemSerializer; }
}
IBsonSerializer IChildSerializerConfigurable.WithChildSerializer(IBsonSerializer childSerializer)
{
return WithItemSerializer(childSerializer);
}
}
/// <summary>
/// Represents a serializer for a class that implementes <see cref="IEnumerable{TItem}"/>.
/// </summary>
/// <typeparam name="TValue">The type of the value.</typeparam>
/// <typeparam name="TItem">The type of the item.</typeparam>
public class EnumerableInterfaceImplementerSerializer<TValue, TItem> :
EnumerableInterfaceImplementerSerializerBase<TValue, TItem>,
IChildSerializerConfigurable
where TValue : class, IEnumerable<TItem>
{
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="EnumerableInterfaceImplementerSerializer{TValue, TItem}"/> class.
/// </summary>
public EnumerableInterfaceImplementerSerializer()
{
}
/// <summary>
/// Initializes a new instance of the <see cref="EnumerableInterfaceImplementerSerializer{TValue, TItem}"/> class.
/// </summary>
/// <param name="itemSerializer">The item serializer.</param>
public EnumerableInterfaceImplementerSerializer(IBsonSerializer<TItem> itemSerializer)
: base(itemSerializer)
{
}
/// <summary>
/// Initializes a new instance of the <see cref="EnumerableInterfaceImplementerSerializer{TValue, TItem}" /> class.
/// </summary>
/// <param name="serializerRegistry">The serializer registry.</param>
public EnumerableInterfaceImplementerSerializer(IBsonSerializerRegistry serializerRegistry)
: base(serializerRegistry)
{
}
// public methods
/// <summary>
/// Returns a serializer that has been reconfigured with the specified item serializer.
/// </summary>
/// <param name="itemSerializer">The item serializer.</param>
/// <returns>The reconfigured serializer.</returns>
public EnumerableInterfaceImplementerSerializer<TValue, TItem> WithItemSerializer(IBsonSerializer<TItem> itemSerializer)
{
return new EnumerableInterfaceImplementerSerializer<TValue, TItem>(itemSerializer);
}
// protected methods
/// <summary>
/// Creates the accumulator.
/// </summary>
/// <returns>The accumulator.</returns>
protected override object CreateAccumulator()
{
return new List<TItem>();
}
/// <summary>
/// Finalizes the result.
/// </summary>
/// <param name="accumulator">The accumulator.</param>
/// <returns>The final result.</returns>
protected override TValue FinalizeResult(object accumulator)
{
// find and call a constructor that we can pass the accumulator to
var accumulatorType = accumulator.GetType();
foreach (var constructorInfo in typeof(TValue).GetTypeInfo().GetConstructors())
{
var parameterInfos = constructorInfo.GetParameters();
if (parameterInfos.Length == 1 && parameterInfos[0].ParameterType.GetTypeInfo().IsAssignableFrom(accumulatorType))
{
return (TValue)constructorInfo.Invoke(new object[] { accumulator });
}
}
// otherwise try to find a no-argument constructor and an Add method
var valueTypeInfo = typeof(TValue).GetTypeInfo();
var noArgumentConstructorInfo = valueTypeInfo.GetConstructor(new Type[] { });
var addMethodInfo = typeof(TValue).GetTypeInfo().GetMethod("Add", new Type[] { typeof(TItem) });
if (noArgumentConstructorInfo != null && addMethodInfo != null)
{
var value = (TValue)noArgumentConstructorInfo.Invoke(new Type[] { });
foreach (var item in (IEnumerable<TItem>)accumulator)
{
addMethodInfo.Invoke(value, new object[] { item });
}
return value;
}
var message = string.Format("Type '{0}' does not have a suitable constructor or Add method.", typeof(TValue).FullName);
throw new BsonSerializationException(message);
}
// explicit interface implementations
IBsonSerializer IChildSerializerConfigurable.ChildSerializer
{
get { return ItemSerializer; }
}
IBsonSerializer IChildSerializerConfigurable.WithChildSerializer(IBsonSerializer childSerializer)
{
return WithItemSerializer((IBsonSerializer<TItem>)childSerializer);
}
}
}