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MongoQueryable.cs
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MongoQueryable.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;
using System.Linq.Expressions;
using System.Reflection;
namespace MongoDB.Driver.Linq
{
/// <summary>
/// An implementation of IQueryable{{T}} for querying a MongoDB collection.
/// This class has been named MongoQueryable instead of MongoQuery to avoid confusion with IMongoQuery.
/// </summary>
/// <typeparam name="T">The type of the documents being queried.</typeparam>
public class MongoQueryable<T> : IOrderedQueryable<T>
{
// private fields
private MongoQueryProvider _provider;
private Expression _expression;
// constructors
/// <summary>
/// Initializes a new instance of the MongoQueryable class.
/// </summary>
/// <param name="provider">The query provider.</param>
public MongoQueryable(MongoQueryProvider provider)
{
if (provider == null)
{
throw new ArgumentNullException("provider");
}
_provider = provider;
_expression = Expression.Constant(this);
}
/// <summary>
/// Initializes a new instance of the MongoQueryable class.
/// </summary>
/// <param name="provider">The query provider.</param>
/// <param name="expression">The expression.</param>
public MongoQueryable(MongoQueryProvider provider, Expression expression)
{
if (provider == null)
{
throw new ArgumentNullException("provider");
}
if (expression == null)
{
throw new ArgumentNullException("expression");
}
if (!typeof(IQueryable<T>).GetTypeInfo().IsAssignableFrom(expression.Type))
{
throw new ArgumentOutOfRangeException("expression");
}
_provider = provider;
_expression = expression;
}
// public methods
/// <summary>
/// Gets an enumerator for the results of a MongoDB LINQ query.
/// </summary>
/// <returns>An enumerator for the results of a MongoDB LINQ query.</returns>
public IEnumerator<T> GetEnumerator()
{
return ((IEnumerable<T>)_provider.Execute(_expression)).GetEnumerator();
}
/// <summary>
/// Gets the MongoDB query that will be sent to the server when this LINQ query is executed.
/// </summary>
/// <returns>The MongoDB query.</returns>
public IMongoQuery GetMongoQuery()
{
return _provider.BuildMongoQuery(this);
}
// explicit implementation of IEnumerable
IEnumerator IEnumerable.GetEnumerator()
{
return ((IEnumerable)_provider.Execute(_expression)).GetEnumerator();
}
// explicit implementation of IQueryable
Type IQueryable.ElementType
{
get { return typeof(T); }
}
Expression IQueryable.Expression
{
get { return _expression; }
}
IQueryProvider IQueryable.Provider
{
get { return _provider; }
}
}
}