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SortDefinition.cs
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SortDefinition.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.Expressions;
using MongoDB.Bson;
using MongoDB.Bson.Serialization;
using MongoDB.Driver.Core.Misc;
using MongoDB.Driver.Linq;
namespace MongoDB.Driver
{
/// <summary>
/// The direction of the sort.
/// </summary>
public enum SortDirection
{
/// <summary>
/// Ascending.
/// </summary>
Ascending,
/// <summary>
/// Descending.
/// </summary>
Descending
}
/// <summary>
/// Base class for sorts.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
public abstract class SortDefinition<TDocument>
{
/// <summary>
/// Renders the sort to a <see cref="BsonDocument"/>.
/// </summary>
/// <param name="documentSerializer">The document serializer.</param>
/// <param name="serializerRegistry">The serializer registry.</param>
/// <returns>A <see cref="BsonDocument"/>.</returns>
public virtual BsonDocument Render(IBsonSerializer<TDocument> documentSerializer, IBsonSerializerRegistry serializerRegistry)
{
return Render(documentSerializer, serializerRegistry, LinqProvider.V3);
}
/// <summary>
/// Renders the sort to a <see cref="BsonDocument"/>.
/// </summary>
/// <param name="documentSerializer">The document serializer.</param>
/// <param name="serializerRegistry">The serializer registry.</param>
/// <param name="linqProvider">The LINQ provider.</param>
/// <returns>A <see cref="BsonDocument"/>.</returns>
public abstract BsonDocument Render(IBsonSerializer<TDocument> documentSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider);
/// <summary>
/// Performs an implicit conversion from <see cref="BsonDocument"/> to <see cref="SortDefinition{TDocument}"/>.
/// </summary>
/// <param name="document">The document.</param>
/// <returns>
/// The result of the conversion.
/// </returns>
public static implicit operator SortDefinition<TDocument>(BsonDocument document)
{
if (document == null)
{
return null;
}
return new BsonDocumentSortDefinition<TDocument>(document);
}
/// <summary>
/// Performs an implicit conversion from <see cref="System.String"/> to <see cref="SortDefinition{TDocument}"/>.
/// </summary>
/// <param name="json">The JSON string.</param>
/// <returns>
/// The result of the conversion.
/// </returns>
public static implicit operator SortDefinition<TDocument>(string json)
{
if (json == null)
{
return null;
}
return new JsonSortDefinition<TDocument>(json);
}
}
/// <summary>
/// A <see cref="BsonDocument"/> based sort.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
public sealed class BsonDocumentSortDefinition<TDocument> : SortDefinition<TDocument>
{
private readonly BsonDocument _document;
/// <summary>
/// Initializes a new instance of the <see cref="BsonDocumentSortDefinition{TDocument}"/> class.
/// </summary>
/// <param name="document">The document.</param>
public BsonDocumentSortDefinition(BsonDocument document)
{
_document = Ensure.IsNotNull(document, nameof(document));
}
/// <summary>
/// Gets the document.
/// </summary>
public BsonDocument Document
{
get { return _document; }
}
/// <inheritdoc />
public override BsonDocument Render(IBsonSerializer<TDocument> documentSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider)
{
return _document;
}
}
/// <summary>
/// A JSON <see cref="String" /> based sort.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
public sealed class JsonSortDefinition<TDocument> : SortDefinition<TDocument>
{
private readonly string _json;
/// <summary>
/// Initializes a new instance of the <see cref="JsonSortDefinition{TDocument}"/> class.
/// </summary>
/// <param name="json">The json.</param>
public JsonSortDefinition(string json)
{
_json = Ensure.IsNotNullOrEmpty(json, nameof(json));
}
/// <summary>
/// Gets the json.
/// </summary>
public string Json
{
get { return _json; }
}
/// <inheritdoc />
public override BsonDocument Render(IBsonSerializer<TDocument> documentSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider)
{
return BsonDocument.Parse(_json);
}
}
/// <summary>
/// An <see cref="Object" /> based sort.
/// </summary>
/// <typeparam name="TDocument">The type of the document.</typeparam>
public sealed class ObjectSortDefinition<TDocument> : SortDefinition<TDocument>
{
private readonly object _obj;
/// <summary>
/// Initializes a new instance of the <see cref="ObjectSortDefinition{TDocument}"/> class.
/// </summary>
/// <param name="obj">The object.</param>
public ObjectSortDefinition(object obj)
{
_obj = Ensure.IsNotNull(obj, nameof(obj));
}
/// <summary>
/// Gets the object.
/// </summary>
public object Object
{
get { return _obj; }
}
/// <inheritdoc />
public override BsonDocument Render(IBsonSerializer<TDocument> documentSerializer, IBsonSerializerRegistry serializerRegistry, LinqProvider linqProvider)
{
var serializer = serializerRegistry.GetSerializer(_obj.GetType());
return new BsonDocumentWrapper(_obj, serializer);
}
}
}