/* Copyright 2010-2011 10gen 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.Generic;
using System.Linq;
using System.Linq.Expressions;
using System.Text;
using System.Threading;

namespace MongoDB.Driver.Linq {
    /// <summary>
    /// Represents a LINQ query that has been translated to an equivalent MongoDB Find query.
    /// </summary>
    public class MongoLinqFindQuery : MongoLinqQuery {
        #region private fields
        private IMongoQuery query;
        #endregion

        #region constructor
        /// <summary>
        /// Initializes a new instance of the MongoLinqFindQuery class.
        /// </summary>
        /// <param name="collection">The collection being queried.</param>
        /// <param name="query">The query.</param>
        public MongoLinqFindQuery(
            MongoCollection collection,
            IMongoQuery query
        )
            : base(collection) {
                this.query = query;
        }
        #endregion

        #region public methods
        /// <summary>
        /// Executes the translated Find query.
        /// </summary>
        /// <returns>The result of executing the translated Find query.</returns>
        public override IEnumerator<T> GetEnumerator<T>() {
            var cursor = collection.FindAs<T>(query);
            // TODO: modify the cursor with things like sort order, skip and limit
            return cursor.GetEnumerator();
        }
        #endregion
    }
}