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/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / DataWeb / Client / System / Data / Services / Client / DataServiceRequest.cs / 1305376 / DataServiceRequest.cs
//---------------------------------------------------------------------- //// Copyright (c) Microsoft Corporation. All rights reserved. // //// query request object // //--------------------------------------------------------------------- namespace System.Data.Services.Client { using System; using System.Collections; using System.Collections.Generic; using System.Diagnostics; using System.IO; using System.Linq; using System.Text; #if !ASTORIA_LIGHT // Data.Services http stack using System.Net; #else using System.Data.Services.Http; #endif using System.Xml; ///non-generic placeholder for generic implementation public abstract class DataServiceRequest { ///internal constructor so that only our assembly can provide an implementation internal DataServiceRequest() { } ///Element Type public abstract Type ElementType { get; } ///Gets the URI for a the query public abstract Uri RequestUri { get; } ///The ProjectionPlan for the request, if precompiled in a previous page; null otherwise. internal abstract ProjectionPlan Plan { get; } ///The TranslateResult associated with this request internal abstract QueryComponents QueryComponents { get; } ///Gets the URI for a the query ///a string with the URI public override string ToString() { return this.QueryComponents.Uri.ToString(); } ////// get an enumerable materializes the objects the response /// /// context /// query components /// Projection plan (if compiled in an earlier query). /// contentType /// method to get http response stream ///atom materializer [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Reliability", "CA2000:Dispose objects before losing scope", Justification = "Returning MaterializeAtom, caller will dispose")] internal static MaterializeAtom Materialize(DataServiceContext context, QueryComponents queryComponents, ProjectionPlan plan, string contentType, Stream response) { Debug.Assert(null != queryComponents, "querycomponents"); string mime = null; Encoding encoding = null; if (!String.IsNullOrEmpty(contentType)) { HttpProcessUtility.ReadContentType(contentType, out mime, out encoding); } if (String.Equals(mime, XmlConstants.MimeApplicationAtom, StringComparison.OrdinalIgnoreCase) || String.Equals(mime, XmlConstants.MimeApplicationXml, StringComparison.OrdinalIgnoreCase)) { if (null != response) { XmlReader reader = XmlUtil.CreateXmlReader(response, encoding); return new MaterializeAtom(context, reader, queryComponents, plan, context.MergeOption); } } return MaterializeAtom.EmptyResults; } ////// Creates a instance of strongly typed DataServiceRequest with the given element type. /// /// element type for the DataServiceRequest. /// constructor parameter. ///returns the strongly typed DataServiceRequest instance. internal static DataServiceRequest GetInstance(Type elementType, Uri requestUri) { Type genericType = typeof(DataServiceRequest<>).MakeGenericType(elementType); return (DataServiceRequest)Activator.CreateInstance(genericType, new object[] { requestUri }); } ////// Ends an asynchronous request to an Internet resource. /// ///Element type of the result. /// Source object of async request. /// The data service context. /// The asyncResult being ended. ///The response - result of the request. internal static IEnumerableEndExecute (object source, DataServiceContext context, IAsyncResult asyncResult) { QueryResult result = null; try { result = QueryResult.EndExecute (source, asyncResult); return result.ProcessResult (context, result.ServiceRequest.Plan); } catch (DataServiceQueryException ex) { Exception inEx = ex; while (inEx.InnerException != null) { inEx = inEx.InnerException; } DataServiceClientException serviceEx = inEx as DataServiceClientException; if (context.IgnoreResourceNotFoundException && serviceEx != null && serviceEx.StatusCode == (int)HttpStatusCode.NotFound) { QueryOperationResponse qor = new QueryOperationResponse (new Dictionary (ex.Response.Headers), ex.Response.Query, MaterializeAtom.EmptyResults); qor.StatusCode = (int)HttpStatusCode.NotFound; return (IEnumerable )qor; } throw; } } #if !ASTORIA_LIGHT // Synchronous methods not available /// /// execute uri and materialize result /// ///element type /// context /// query components for request to execute ///enumerable of results internal QueryOperationResponseExecute (DataServiceContext context, QueryComponents queryComponents) { QueryResult result = null; try { DataServiceRequest serviceRequest = new DataServiceRequest (queryComponents, this.Plan); result = serviceRequest.CreateResult(this, context, null, null); result.Execute(); return result.ProcessResult (context, this.Plan); } catch (InvalidOperationException ex) { QueryOperationResponse operationResponse = result.GetResponse (MaterializeAtom.EmptyResults); if (null != operationResponse) { if (context.IgnoreResourceNotFoundException) { DataServiceClientException cex = ex as DataServiceClientException; if (cex != null && cex.StatusCode == (int)HttpStatusCode.NotFound) { // don't throw return (QueryOperationResponse )operationResponse; } } operationResponse.Error = ex; throw new DataServiceQueryException(Strings.DataServiceException_GeneralError, ex, operationResponse); } throw; } } /// /// Synchronizely get the query set count from the server by executing the $count=value query /// /// The context ///The server side count of the query set internal long GetQuerySetCount(DataServiceContext context) { Debug.Assert(null != context, "context is null"); this.QueryComponents.Version = Util.DataServiceVersion2; QueryResult response = null; DataServiceRequestserviceRequest = new DataServiceRequest (this.QueryComponents, null); HttpWebRequest request = context.CreateRequest(this.QueryComponents.Uri, XmlConstants.HttpMethodGet, false, null, this.QueryComponents.Version, false); request.Accept = "text/plain"; response = new QueryResult(this, "Execute", serviceRequest, request, null, null); try { response.Execute(); if (HttpStatusCode.NoContent != response.StatusCode) { StreamReader sr = new StreamReader(response.GetResponseStream()); long r = -1; try { r = XmlConvert.ToInt64(sr.ReadToEnd()); } finally { sr.Close(); } return r; } else { throw new DataServiceQueryException(Strings.DataServiceRequest_FailGetCount, response.Failure); } } catch (InvalidOperationException ex) { QueryOperationResponse operationResponse = null; operationResponse = response.GetResponse (MaterializeAtom.EmptyResults); if (null != operationResponse) { operationResponse.Error = ex; throw new DataServiceQueryException(Strings.DataServiceException_GeneralError, ex, operationResponse); } throw; } } #endif /// /// Begins an asynchronous request to an Internet resource. /// /// source of execute (DataServiceQuery or DataServiceContext /// context /// The AsyncCallback delegate. /// The state object for this request. ///An IAsyncResult that references the asynchronous request for a response. internal IAsyncResult BeginExecute(object source, DataServiceContext context, AsyncCallback callback, object state) { QueryResult result = this.CreateResult(source, context, callback, state); result.BeginExecute(); return result; } ////// Creates the result object for the specified query parameters. /// /// The source object for the request. /// The data service context. /// The AsyncCallback delegate. /// The state object for the callback. ///Result representing the create request. The request has not been initiated yet. private QueryResult CreateResult(object source, DataServiceContext context, AsyncCallback callback, object state) { Debug.Assert(null != context, "context is null"); HttpWebRequest request = context.CreateRequest(this.QueryComponents.Uri, XmlConstants.HttpMethodGet, false, null, this.QueryComponents.Version, false); return new QueryResult(source, "Execute", this, request, callback, state); } } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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