public static QueryableExecutionModel Build(Expression node, IBsonSerializerRegistry serializerRegistry)
{
var builder = new QueryableExecutionModelBuilder(serializerRegistry);
builder.Visit(node);
return (QueryableExecutionModel)Activator.CreateInstance(
typeof(AggregateQueryableExecutionModel<>).MakeGenericType(builder._serializer.ValueType),
builder._stages,
builder._serializer);
}
public static QueryableExecutionModel Build(Expression node, IBsonSerializerRegistry serializerRegistry)
{
var builder = new QueryableExecutionModelBuilder(serializerRegistry);
builder.Visit(node);
return((QueryableExecutionModel)Activator.CreateInstance(
typeof(AggregateQueryableExecutionModel <>).MakeGenericType(builder._serializer.ValueType),
builder._stages,
builder._serializer));
}
protected internal override Expression VisitProjection(ProjectionExpression node)
{
var model = QueryableExecutionModelBuilder.Build(node, _serializerRegistry);
Expression executor;
if (_cancellationToken != null)
{
// we are async
executor = Expression.Call(
_provider,
"ExecuteAsync",
Type.EmptyTypes,
Expression.Constant(model, typeof(QueryableExecutionModel)),
_cancellationToken);
if (node.Aggregator != null)
{
executor = Expression.Invoke(
node.Aggregator,
Expression.Convert(executor, node.Aggregator.Parameters[0].Type),
_cancellationToken);
}
}
else
{
// we are sync
executor = Expression.Call(
_provider,
"Execute",
Type.EmptyTypes,
Expression.Constant(model, typeof(QueryableExecutionModel)));
if (node.Aggregator != null)
{
executor = Expression.Invoke(
node.Aggregator,
Expression.Convert(executor, node.Aggregator.Parameters[0].Type));
}
}
return(executor);
}
public QueryableExecutionModel BuildExecutionModel(Expression expression)
{
return(QueryableExecutionModelBuilder.Build(
Prepare(expression),
_collection.Settings.SerializerRegistry));
}
