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107 lines
3.3 KiB
107 lines
3.3 KiB
/* Copyright 2010-2011 10gen Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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using System.Text;
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using System.Threading;
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namespace MongoDB.Driver.Linq {
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/// <summary>
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/// An implementation of IQueryable{{T}} for querying a MongoDB collection.
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/// </summary>
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public class MongoQueryable<T> : IOrderedQueryable<T> {
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#region private fields
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private MongoQueryProvider provider;
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private Expression expression;
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#endregion
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#region constructors
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/// <summary>
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/// Initializes a new instance of the MongoQueryable class.
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/// </summary>
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public MongoQueryable(
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MongoQueryProvider provider
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) {
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if (provider == null) {
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throw new ArgumentNullException("provider");
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}
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this.provider = provider;
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this.expression = Expression.Constant(this);
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}
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/// <summary>
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/// Initializes a new instance of the MongoQueryable class.
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/// </summary>
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public MongoQueryable(
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MongoQueryProvider provider,
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Expression expression
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) {
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if (provider == null) {
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throw new ArgumentNullException("provider");
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}
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if (expression == null) {
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throw new ArgumentNullException("expression");
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}
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if (!typeof(IQueryable<T>).IsAssignableFrom(expression.Type)) {
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throw new ArgumentOutOfRangeException("expression");
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}
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this.provider = provider;
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this.expression = expression;
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}
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#endregion
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#region public methods
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/// <summary>
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/// Gets an enumerator for the results of a MongoDB LINQ query.
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/// </summary>
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/// <returns></returns>
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public IEnumerator<T> GetEnumerator() {
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return provider.GetEnumerator<T>(expression);
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}
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/// <summary>
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/// Gets a string representation of the MongoDB query obtained by translating the LINQ query.
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/// </summary>
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/// <returns></returns>
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public override string ToString() {
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return provider.GetQueryText(expression);
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}
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#endregion
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#region explicit implementation of IEnumerable
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IEnumerator IEnumerable.GetEnumerator() {
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return GetEnumerator();
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}
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#endregion
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#region explicit implementation of IQueryable
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Type IQueryable.ElementType {
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get { return typeof(T); }
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}
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Expression IQueryable.Expression {
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get { return expression; }
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}
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IQueryProvider IQueryable.Provider {
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get { return provider; }
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}
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#endregion
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}
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}
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