private Stream <CompilationMessage> ValidateAggregationUpdateMethod(ExecutableElement aggregationFunction, Element returnType, IList <ExecutableElement> updateMethods)
{
if (updateMethods.Count != 1)
{
return(Stream.of(MissingAnnotation(aggregationFunction, returnType, updateMethods, typeof(UserAggregationUpdate))));
}
Stream <CompilationMessage> errors = Stream.empty();
ExecutableElement updateMethod = updateMethods.GetEnumerator().next();
if (!IsValidUpdateSignature(updateMethod))
{
errors = Stream.of(new AggregationError(updateMethod, "@%s usage error: method should be public, non-static and define 'void' as return type.", typeof(UserAggregationUpdate).Name));
}
return(Stream.concat(errors, _functionVisitor.validateParameters(updateMethod.Parameters)));
}
public override Stream <CompilationMessage> VisitExecutable(ExecutableElement executableElement, Void ignored)
{
return(Stream.of <Stream <CompilationMessage> >(_functionVisitor.validateEnclosingClass(executableElement), _functionVisitor.validateParameters(executableElement.Parameters), _functionVisitor.validateName(executableElement), _functionVisitor.validateReturnType(executableElement)).flatMap(System.Func.identity()));
}
