File: QueryResponse.cs

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//Copyright 2010 Microsoft Corporation
//
//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.


namespace System.Data.Services.Client
{
    #region Namespaces.

    using System;
    using System.Collections;
    using System.Collections.Generic;
    using System.Reflection;
    using System.Diagnostics;

    #endregion Namespaces.

    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Design", "CA1010", Justification = "required for this feature")]
    [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1710", Justification = "required for this feature")]
    public class QueryOperationResponse : OperationResponse, System.Collections.IEnumerable
    {
        #region Private fields.

        private readonly DataServiceRequest query;

        private readonly MaterializeAtom results;

        #endregion Private fields.

        internal QueryOperationResponse(Dictionary<string, string> headers, DataServiceRequest query, MaterializeAtom results)
            : base(headers)
        {
            this.query = query;
            this.results = results;
        }

        public DataServiceRequest Query
        {
            get { return this.query; }
        }

        public virtual long TotalCount
        {
            get
            {
                throw new NotSupportedException();
            }
        }

        internal MaterializeAtom Results
        {
            get
            {
                if (null != this.Error)
                {
                    throw System.Data.Services.Client.Error.InvalidOperation(Strings.Context_BatchExecuteError, this.Error);
                }

                return this.results;
            }
        }

        public System.Collections.IEnumerator GetEnumerator()
        {
            return this.Results.GetEnumerator();
        }

        public DataServiceQueryContinuation GetContinuation()
        {
            return this.results.GetContinuation(null);
        }

        public DataServiceQueryContinuation GetContinuation(IEnumerable collection)
        {
            return this.results.GetContinuation(collection);
        }

        public DataServiceQueryContinuation<T> GetContinuation<T>(IEnumerable<T> collection)
        {
            return (DataServiceQueryContinuation<T>)this.results.GetContinuation(collection);
        }

        internal static QueryOperationResponse GetInstance(Type elementType, Dictionary<string, string> headers, DataServiceRequest query, MaterializeAtom results)
        {
            Type genericType = typeof(QueryOperationResponse<>).MakeGenericType(elementType);
#if !ASTORIA_LIGHT
            return (QueryOperationResponse)Activator.CreateInstance(
                genericType,
                BindingFlags.CreateInstance | BindingFlags.NonPublic | BindingFlags.Instance,
                null,
                new object[] { headers, query, results },
                System.Globalization.CultureInfo.InvariantCulture);
#else
            System.Reflection.ConstructorInfo[] info = genericType.GetConstructors(BindingFlags.NonPublic | BindingFlags.Instance);
            System.Diagnostics.Debug.Assert(1 == info.Length, "only expected 1 ctor");
            return (QueryOperationResponse)Util.ConstructorInvoke(info[0],new object[] { headers, query, results });
#endif
        }
    }
}