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GroupByBuilder.cs
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GroupByBuilder.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.Linq;
using System.Linq.Expressions;
using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Bson.Serialization.Attributes;
using MongoDB.Bson.Serialization.Serializers;
using MongoDB.Driver.Linq.Utils;
namespace MongoDB.Driver.Builders
{
/// <summary>
/// A builder for specifying what the GroupBy command should group by.
/// </summary>
public static class GroupBy
{
// public static methods
/// <summary>
/// Sets a key function.
/// </summary>
/// <param name="keyFunction">The key function.</param>
/// <returns>A BsonJavaScript.</returns>
public static BsonJavaScript Function(BsonJavaScript keyFunction)
{
return keyFunction;
}
/// <summary>
/// Sets one or more key names.
/// </summary>
/// <param name="names">One or more key names.</param>
/// <returns>The builder (so method calls can be chained).</returns>
public static GroupByBuilder Keys(params string[] names)
{
return new GroupByBuilder(names);
}
}
/// <summary>
/// A builder for specifying what the GroupBy command should group by.
/// </summary>
[Serializable]
[BsonSerializer(typeof(GroupByBuilder.Serializer))]
public class GroupByBuilder : BuilderBase, IMongoGroupBy
{
// private fields
private BsonDocument _document;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="GroupByBuilder"/> class.
/// </summary>
public GroupByBuilder()
{
_document = new BsonDocument();
}
/// <summary>
/// Initializes a new instance of the GroupByBuilder class.
/// </summary>
/// <param name="names">One or more key names.</param>
public GroupByBuilder(string[] names)
: this()
{
Keys(names);
}
// public methods
/// <summary>
/// Sets one or more key names.
/// </summary>
/// <param name="names">The names.</param>
/// <returns>The builder (so method calls can be chained).</returns>
public GroupByBuilder Keys(params string[] names)
{
foreach (var name in names)
{
_document.Add(name, 1);
}
return this;
}
/// <summary>
/// Returns the result of the builder as a BsonDocument.
/// </summary>
/// <returns>A BsonDocument.</returns>
public override BsonDocument ToBsonDocument()
{
return _document;
}
// nested classes
new internal class Serializer : SerializerBase<GroupByBuilder>
{
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, GroupByBuilder value)
{
BsonDocumentSerializer.Instance.Serialize(context, value._document);
}
}
}
/// <summary>
/// A builder for specifying what the GroupBy command should group by.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
public static class GroupBy<TDocument>
{
// public static methods
/// <summary>
/// Sets one or more key names.
/// </summary>
/// <param name="memberExpressions">One or more key names.</param>
/// <returns>The builder (so method calls can be chained).</returns>
public static GroupByBuilder<TDocument> Keys(params Expression<Func<TDocument, object>>[] memberExpressions)
{
return new GroupByBuilder<TDocument>().Keys(memberExpressions);
}
}
/// <summary>
/// A builder for specifying what the GroupBy command should group by.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
[BsonSerializer(typeof(GroupByBuilder<>.Serializer))]
public class GroupByBuilder<TDocument> : BuilderBase, IMongoGroupBy
{
// private fields
private readonly BsonSerializationInfoHelper _serializationInfoHelper;
private GroupByBuilder _groupByBuilder;
// constructors
/// <summary>
/// Initializes a new instance of the <see cref="GroupByBuilder{TDocument}"/> class.
/// </summary>
public GroupByBuilder()
{
_serializationInfoHelper = new BsonSerializationInfoHelper();
_groupByBuilder = new GroupByBuilder();
}
// public methods
/// <summary>
/// Sets one or more key names.
/// </summary>
/// <param name="memberExpressions">One or more key names.</param>
/// <returns>The builder (so method calls can be chained).</returns>
public GroupByBuilder<TDocument> Keys(params Expression<Func<TDocument, object>>[] memberExpressions)
{
var names = memberExpressions
.Select(x => _serializationInfoHelper.GetSerializationInfo(x))
.Select(x => x.ElementName);
_groupByBuilder = _groupByBuilder.Keys(names.ToArray());
return this;
}
/// <summary>
/// Converts this object to a BsonDocument.
/// </summary>
/// <returns>A BsonDocument.</returns>
public override BsonDocument ToBsonDocument()
{
return _groupByBuilder.ToBsonDocument();
}
// nested classes
new internal class Serializer : SerializerBase<GroupByBuilder<TDocument>>
{
public override void Serialize(BsonSerializationContext context, BsonSerializationArgs args, GroupByBuilder<TDocument> value)
{
BsonDocumentSerializer.Instance.Serialize(context, value._groupByBuilder.ToBsonDocument());
}
}
}
}