/// <summary>
/// Begins the asynchronous variation.
/// </summary>
/// <param name="name">The name of the variation (will be the name of the method in the generated code).</param>
/// <returns>
/// CodeDom <see cref="CodeExpression"/> which can be used to refer to asynchronous continuation parameter in the generated code.
/// </returns>
public override CodeExpression BeginAsyncVariation(string name)
{
this.EnsureNotInBlock();
this.nextVariableSuffix.Clear();
this.currentVariation = this.currentBlock = new BlockInformation(name, BlockType.Method, new CodeStatementCollection(), true);
return(Code.Argument("continuation"));
}
/// <summary>
/// Generates System.CodeDom.CodeExpression from the given expression.
/// </summary>
/// <param name="expression">Expression from which System.CodeDom.CodeExpression is generated.</param>
/// <returns>Generated System.CodeDom.CodeExpression.</returns>
public override CodeExpression Visit(LinqParameterExpression expression)
{
CodeParameterDeclarationExpression prm;
if (!this.ParameterNamesDictionary.TryGetValue(expression, out prm))
{
// for query syntax specific methods we use ParameterNamesDictionary, for non-specific methods (like Count, All, Any) we fall back to
// using parametr name (just like in method syntax)
return(Code.Argument(expression.Name));
}
else
{
return(Code.Argument(prm.Name));
}
}
private void BuildExecuteAndCompareAsyncCall(Dictionary <string, ReadOnlyCollection <QueryExpression> > freeVariableValues, CodeExpression continuationExpression, CodeExpressionWithFreeVariables generatedCode, int maxValueCount, Dictionary <string, QueryExpression> freeVariableAssignments, CodeExpression queryVariable)
{
var listVariable = this.CodeBuilder.Declare(
"actionList",
Code.New(Code.TypeRef <List <Action <IAsyncContinuation> > >()));
for (int j = 0; j < maxValueCount; ++j)
{
if (j > 0)
{
// for anything but the first value, set the new value of each free variable
var lambda = Code.Lambda().WithParameter("c");
this.CodeBuilder.BeginLambda(lambda);
foreach (var freeVar in generatedCode.FreeVariables)
{
this.CodeBuilder.Add(Code.Variable(freeVar.Name).Assign(freeVar.PossibleValues[j % freeVar.PossibleValues.Count]));
}
this.CodeBuilder.Add(Code.Argument("c").Call("Continue"));
this.CodeBuilder.EndLambda();
this.CodeBuilder.Add(listVariable.Call("Add", lambda));
}
foreach (var free in generatedCode.FreeVariables)
{
freeVariableAssignments[free.Name] = freeVariableValues[free.Name][j % freeVariableValues[free.Name].Count];
}
var lambdaBody = this.BuildQueryExecuteCallAndVariables(Code.Argument("c"), queryVariable, freeVariableAssignments);
// add the lambda body to the list
this.CodeBuilder.Add(listVariable.Call("Add", Code.Lambda().WithParameter("c").WithBody(lambdaBody)));
}
// add code to run all lambdas accumulated so far
this.CodeBuilder.Add(Code.Type(typeof(AsyncHelpers).Name).Call("RunActionSequence", continuationExpression, listVariable));
}
private CodeExpression RewritePropertyReference(CodePropertyReferenceExpression propertyReference, ref bool didRewrite)
{
var targetRef = propertyReference.TargetObject as CodePropertyReferenceExpression;
if (targetRef != null)
{
//
// Replace this pattern :
// context.entity
//
// With:
// context.GetQueryRootForResourceSet(<entity reference name>).Cast<entity type>()
//
if (targetRef.PropertyName.Equals(DictionaryProviderServiceMethodResolver.ContextInstancePropertyName))
{
var entitySet = this.model.GetDefaultEntityContainer().EntitySets.SingleOrDefault(s => s.Name == propertyReference.PropertyName);
if (entitySet != null)
{
this.rootEntitySet = entitySet;
var setLambda = Code.Lambda().WithParameter("s").WithBody(Code.Argument("s").Property("Name").Equal(Code.Primitive(entitySet.Name), DataTypes.String));
var setReference = Code.This().Property(DictionaryProviderServiceMethodResolver.ContextInstancePropertyName).Property(ResourceSetsPropertyName).Call("Single", setLambda);
var setBaseTypeReference = this.GetClrTypeReference(entitySet.EntityType);
didRewrite = true;
return(targetRef.Call(RootQueryMethodName, setReference).Call("Cast", new CodeTypeReference[] { setBaseTypeReference }));
}
}
}
else if (propertyReference.TargetObject is CodeArgumentReferenceExpression)
{
if (this.rootEntitySet != null)
{
// TODO: more derived types?
var entityType = this.rootEntitySet.EntityType;
var property = entityType.AllProperties.Where(p => p.Name == propertyReference.PropertyName && !p.IsTypeBacked()).SingleOrDefault();
if (property != null)
{
//
// Replace this pattern:
// arg.EntityProperty
// With:
// (<property type>)arg[<PropertyName>]
//
var propertyType = property.PropertyType;
CodeTypeReference propertyTypeRef = Code.TypeRef(typeof(object));
if (propertyType != null)
{
var primitivePropertyType = propertyType as PrimitiveDataType;
if (primitivePropertyType != null)
{
var clrType = primitivePropertyType.GetFacetValue <PrimitiveClrTypeFacet, Type>(typeof(object));
// We need to make sure we have the right primitive type for the cast below.
// If its a nullable property, then the CLR type we cast to must be nullable as well
bool clrTypeIsNullable = clrType.IsClass() || Nullable.GetUnderlyingType(clrType) != null;
if (primitivePropertyType.IsNullable && !clrTypeIsNullable)
{
clrType = typeof(Nullable <>).MakeGenericType(clrType);
}
propertyTypeRef = Code.TypeRef(clrType);
}
var complexPropertyType = propertyType as ComplexDataType;
if (complexPropertyType != null)
{
propertyTypeRef = this.GetClrTypeReference(complexPropertyType.Definition);
}
}
didRewrite = true;
return(propertyReference.TargetObject.Index(Code.Primitive(propertyReference.PropertyName)).Cast(propertyTypeRef));
}
}
}
return(base.Rewrite(propertyReference, ref didRewrite));
}
/// <summary>
/// Generates System.CodeDom.CodeExpression from the given expression.
/// </summary>
/// <param name="expression">Expression from which System.CodeDom.CodeExpression is generated.</param>
/// <returns>Generated System.CodeDom.CodeExpression.</returns>
public override CodeExpression Visit(LinqParameterExpression expression)
{
return(Code.Argument(expression.Name));
}