/// <summary>
/// Build QueryValue from query expresion and server response.
/// </summary>
/// <param name="expression">The query expresion of client request.</param>
/// <param name="response">The http response from the server.</param>
/// <returns>The baseline QueryValue converted from payload.</returns>
public QueryValue BuildQueryValue(QueryExpression expression, HttpResponseData response)
{
ExceptionUtilities.CheckArgumentNotNull(expression, "expression");
ExceptionUtilities.CheckArgumentNotNull(response, "response");
ExceptionUtilities.CheckAllRequiredDependencies(this);
// get type resolver and payload deserializer.
var typeResolver = new LinqToAstoriaTypeResolutionVisitor(this.TypeLibrary);
// if the response has an error
if (response.StatusCode != HttpStatusCode.OK)
{
return(expression.ExpressionType.CreateErrorValue(new QueryError("Response from server has an error!")));
}
string contentType;
ExceptionUtilities.Assert(response.Headers.TryGetValue(HttpHeaders.ContentType, out contentType), "Cannot get content type from response.");
var deserializer = this.StrategySelector.GetStrategy(contentType, null).GetDeserializer();
this.currentExpression = expression;
var expressionForUri = this.ClientSideProjectionReplacer.ReplaceClientSideProjections(expression);
ODataUri queryUri = this.QueryToODataUriConverter.ComputeUri(expressionForUri);
queryUri.Segments.Insert(0, ODataUriBuilder.Root(this.Workspace.ServiceUri));
// deserialize byte array payload to OData payload element.
ODataPayloadElement payload = this.DeserializePayloadData(deserializer, response, queryUri);
this.PayloadElementMetadataResolver.ResolveMetadata(payload, queryUri);
var normalizer = this.StrategySelector.GetStrategy(contentType, null).GetPayloadNormalizer();
payload = normalizer.Normalize(payload);
if (this.ShouldUsePayloadDrivenVerification(queryUri))
{
return(this.BuildQueryValueForActionResponse(payload, expression.ExpressionType));
}
else
{
// build query data set from payload for evaluation. It's a different data set from the initial one of current workspace.
IQueryDataSet dataSet = this.BuildQueryDataSet(payload);
// filter the query and resolve types. Need to remove expressions such as $top, $skip, $orderby, $filter because the returned payload is already the result of performing these expressions.
// need to keep root expression, key expression, $expand and $select to have correct anonymous type.
var filteredQuery = this.FilterExpression(expression);
filteredQuery = typeResolver.ResolveTypes(filteredQuery, this.EvaluationStrategy);
// replace the evaluator's query-data-set with the one generated in the payload
using (this.Evaluator.WithTemporaryDataSet(dataSet))
{
return(this.Evaluator.Evaluate(filteredQuery));
}
}
}
/// <summary>
/// Initializes a new instance of the LinqToAstoriaCustomFunctionResolutionVisitor class
/// </summary>
/// <param name="typeResolver">The Type Resolution visitor</param>
internal LinqToAstoriaCustomFunctionResolutionVisitor(LinqToAstoriaTypeResolutionVisitor typeResolver)
{
this.typeResolver = typeResolver;
}
/// <summary>
/// Initializes a new instance of the LinqToAstoriaQueryResolver class.
/// </summary>
/// <param name="identifierGenerator">Identifier generator.</param>
/// <param name="typeLibrary">The query type library.</param>
public LinqToAstoriaQueryResolver(IIdentifierGenerator identifierGenerator, QueryTypeLibrary typeLibrary)
{
this.parameterNameResolutionVisitor = new LinqToAstoriaParameterNameResolutionVisitor(identifierGenerator);
this.typeResolver = new LinqToAstoriaTypeResolutionVisitor(typeLibrary);
this.customFunctionResolutionVisitor = new LinqToAstoriaCustomFunctionResolutionVisitor(this.typeResolver);
}
