public Expression Bind(PipelineExpression pipeline, PipelineBindingContext bindingContext, MethodCallExpression node, IEnumerable <Expression> arguments)
{
var source = pipeline.Source;
if (arguments.Any())
{
source = BinderHelper.BindWhere(
pipeline,
bindingContext,
ExpressionHelper.GetLambda(arguments.Single()));
}
var serializer = bindingContext.GetSerializer(node.Type, null);
var accumulator = new AccumulatorExpression(
node.Type,
"__result",
serializer,
AccumulatorType.Sum,
Expression.Constant(1));
source = new GroupByExpression(
node.Type,
source,
Expression.Constant(1),
new[] { accumulator });
return(new PipelineExpression(
source,
new FieldExpression(accumulator.FieldName, accumulator.Serializer),
new CountResultOperator(
node.Type,
bindingContext.GetSerializer(node.Type, node))));
}
public Expression Bind(PipelineExpression pipeline, EmbeddedPipelineBindingContext bindingContext, MethodCallExpression node, IEnumerable <Expression> arguments)
{
var source = BinderHelper.BindWhere(
pipeline,
bindingContext,
ExpressionHelper.GetLambda(arguments.Single()));
return(new PipelineExpression(
source,
pipeline.Projector));
}
public Expression Bind(PipelineExpression pipeline, EmbeddedPipelineBindingContext bindingContext, MethodCallExpression node, IEnumerable <Expression> arguments)
{
var source = pipeline.Source;
if (arguments.Any())
{
source = BinderHelper.BindWhere(
pipeline,
bindingContext,
ExpressionHelper.GetLambda(arguments.Single()));
}
return(new PipelineExpression(
source,
pipeline.Projector,
new CountResultOperator(node.Type)));
}
public Expression Bind(PipelineExpression pipeline, PipelineBindingContext bindingContext, MethodCallExpression node, IEnumerable <Expression> arguments)
{
var source = pipeline.Source;
if (arguments.Any())
{
source = BinderHelper.BindWhere(
pipeline,
bindingContext,
ExpressionHelper.GetLambda(arguments.Single()));
}
source = new TakeExpression(source, Expression.Constant(1));
return(new PipelineExpression(
source,
pipeline.Projector,
new AnyResultOperator()));
}
public Expression Bind(PipelineExpression pipeline, EmbeddedPipelineBindingContext bindingContext, MethodCallExpression node, IEnumerable <Expression> arguments)
{
var source = pipeline.Source;
if (arguments.Any())
{
source = BinderHelper.BindWhere(
pipeline,
bindingContext,
ExpressionHelper.GetLambda(arguments.Single()));
}
return(new PipelineExpression(
source,
pipeline.Projector,
new FirstResultOperator(
node.Type,
pipeline.Projector.Serializer,
node.Method.Name == nameof(Enumerable.FirstOrDefault))));
}
