public AccumulatorExpression(Type type, string fieldName, IBsonSerializer serializer, AccumulatorType accumulatorType, Expression argument)
{
_type = Ensure.IsNotNull(type, nameof(type));
_fieldName = Ensure.IsNotNull(fieldName, nameof(fieldName));
_serializer = Ensure.IsNotNull(serializer, nameof(serializer));
_accumulatorType = accumulatorType;
_argument = Ensure.IsNotNull(argument, nameof(argument));
}
public AccumulatorExpression(Type type, string fieldName, IBsonSerializer serializer, AccumulatorType accumulatorType, Expression argument)
{
_type = Ensure.IsNotNull(type, nameof(type));
_fieldName = Ensure.IsNotNull(fieldName, nameof(fieldName));
_serializer = Ensure.IsNotNull(serializer, nameof(serializer));
_accumulatorType = accumulatorType;
_argument = Ensure.IsNotNull(argument, nameof(argument));
}
private bool TryGetAccumulatorType(string methodName, out AccumulatorType accumulatorType)
{
switch (methodName)
{
case "Average":
accumulatorType = AccumulatorType.Average;
return(true);
case "Count":
case "LongCount":
case "Sum":
accumulatorType = AccumulatorType.Sum;
return(true);
case "Distinct":
accumulatorType = AccumulatorType.AddToSet;
return(true);
case "First":
accumulatorType = AccumulatorType.First;
return(true);
case "Last":
accumulatorType = AccumulatorType.Last;
return(true);
case "Max":
accumulatorType = AccumulatorType.Max;
return(true);
case "Min":
accumulatorType = AccumulatorType.Min;
return(true);
case "Select":
case "ToArray":
case "ToList":
accumulatorType = AccumulatorType.Push;
return(true);
}
accumulatorType = 0; // dummy assignment to appease compiler
return(false);
}
private bool TryGetAccumulatorTypeAndArgument(PipelineExpression node, out AccumulatorType accumulatorType, out Expression argument)
{
if (node.ResultOperator == null)
{
var distinct = node.Source as DistinctExpression;
if (distinct != null)
{
accumulatorType = AccumulatorType.AddToSet;
argument = GetAccumulatorArgument(distinct.Source);
return(true);
}
accumulatorType = AccumulatorType.Push;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
var resultOperator = node.ResultOperator;
if (resultOperator is AverageResultOperator)
{
accumulatorType = AccumulatorType.Average;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is CountResultOperator)
{
accumulatorType = AccumulatorType.Sum;
argument = Expression.Constant(1);
return(true);
}
if (resultOperator is FirstResultOperator)
{
accumulatorType = AccumulatorType.First;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is LastResultOperator)
{
accumulatorType = AccumulatorType.Last;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is MaxResultOperator)
{
accumulatorType = AccumulatorType.Max;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is MinResultOperator)
{
accumulatorType = AccumulatorType.Min;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is SumResultOperator)
{
accumulatorType = AccumulatorType.Sum;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is ArrayResultOperator)
{
accumulatorType = AccumulatorType.Push;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is HashSetResultOperator)
{
accumulatorType = AccumulatorType.AddToSet;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
if (resultOperator is ListResultOperator)
{
accumulatorType = AccumulatorType.Push;
argument = GetAccumulatorArgument(node.Source);
return(true);
}
accumulatorType = 0;
argument = null;
return(false);
}
public AccumulatorExpression(Type type, AccumulatorType accumulatorType, Expression argument)
{
_type = Ensure.IsNotNull(type, "type");
_accumulatorType = accumulatorType;
_argument = argument;
}
private bool TryGetAccumulatorTypeAndArgument(PipelineExpression node, out AccumulatorType accumulatorType, out Expression argument)
{
if (node.ResultOperator == null)
{
var distinct = node.Source as DistinctExpression;
if (distinct != null)
{
accumulatorType = AccumulatorType.AddToSet;
argument = GetAccumulatorArgument(distinct.Source);
return true;
}
accumulatorType = AccumulatorType.Push;
argument = GetAccumulatorArgument(node.Source);
return true;
}
var resultOperator = node.ResultOperator;
if (resultOperator is AverageResultOperator)
{
accumulatorType = AccumulatorType.Average;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is CountResultOperator)
{
accumulatorType = AccumulatorType.Sum;
argument = Expression.Constant(1);
return true;
}
if (resultOperator is FirstResultOperator)
{
accumulatorType = AccumulatorType.First;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is LastResultOperator)
{
accumulatorType = AccumulatorType.Last;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is MaxResultOperator)
{
accumulatorType = AccumulatorType.Max;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is MinResultOperator)
{
accumulatorType = AccumulatorType.Min;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is StandardDeviationResultOperator)
{
var isSample = ((StandardDeviationResultOperator)resultOperator).IsSample;
accumulatorType = isSample ? AccumulatorType.StandardDeviationSample : AccumulatorType.StandardDeviationPopulation;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is SumResultOperator)
{
accumulatorType = AccumulatorType.Sum;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is ArrayResultOperator)
{
accumulatorType = AccumulatorType.Push;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is HashSetResultOperator)
{
accumulatorType = AccumulatorType.AddToSet;
argument = GetAccumulatorArgument(node.Source);
return true;
}
if (resultOperator is ListResultOperator)
{
accumulatorType = AccumulatorType.Push;
argument = GetAccumulatorArgument(node.Source);
return true;
}
accumulatorType = 0;
argument = null;
return false;
}
public AccumulatorExpression(Type type, AccumulatorType accumulatorType, Expression argument)
{
_type = Ensure.IsNotNull(type, "type");
_accumulatorType = accumulatorType;
_argument = argument;
}
private bool TryGetAccumulatorType(string methodName, out AccumulatorType accumulatorType)
{
switch (methodName)
{
case "Average":
accumulatorType = AccumulatorType.Average;
return true;
case "Count":
case "LongCount":
case "Sum":
accumulatorType = AccumulatorType.Sum;
return true;
case "Distinct":
accumulatorType = AccumulatorType.AddToSet;
return true;
case "First":
accumulatorType = AccumulatorType.First;
return true;
case "Last":
accumulatorType = AccumulatorType.Last;
return true;
case "Max":
accumulatorType = AccumulatorType.Max;
return true;
case "Min":
accumulatorType = AccumulatorType.Min;
return true;
case "Select":
case "ToArray":
case "ToList":
accumulatorType = AccumulatorType.Push;
return true;
}
accumulatorType = 0; // dummy assignment to appease compiler
return false;
}
