private FilterLambdaOperatorDescriptor GetFilterExpressionDescriptor <T>(OperatorDescriptorBase filterBody, string parameterName = "$it")
=> new FilterLambdaOperatorDescriptor
{
FilterBody = filterBody,
SourceElementType = typeof(T).AssemblyQualifiedName,
ParameterName = parameterName
};
private static OperatorDescriptorBase GetTakeOperator(this OperatorDescriptorBase pagingDescriptor, SortCollectionDescriptor sortCollectionDescriptor)
=> sortCollectionDescriptor.Take.HasValue
? new TakeOperatorDescriptor
{
SourceOperand = pagingDescriptor,
Count = sortCollectionDescriptor.Take.Value
}
: pagingDescriptor;
private SelectorLambdaOperatorDescriptor GetExpressionDescriptor <T, TResult>(OperatorDescriptorBase selectorBody, string parameterName = "$it")
=> new SelectorLambdaOperatorDescriptor
{
Selector = selectorBody,
SourceElementType = typeof(T).AssemblyQualifiedName,
ParameterName = parameterName,
BodyType = typeof(TResult).AssemblyQualifiedName
};
public static IExpressionPart MapToOperator(this IMapper mapper, OperatorDescriptorBase expression)
=> mapper.Map <IExpressionPart>
(
expression,
opts => opts.Items[PARAMETERS_KEY] = GetParameters()
);
private static OperatorDescriptorBase CreateSortBody(SortCollectionDescriptor sortCollectionDescriptor, OperatorDescriptorBase sourceOperand)
{
if (sortCollectionDescriptor?.SortDescriptions?.Any() != true)
{
throw new ArgumentException($"{nameof(sortCollectionDescriptor.SortDescriptions)}: C55F5642-5811-4840-B643-E38BDE7DA16E");
}
return(sortCollectionDescriptor.SortDescriptions.Aggregate
(
sourceOperand,
(OperatorDescriptorBase descriptor, SortDescriptionDescriptor next) =>
{
return object.ReferenceEquals(descriptor, sourceOperand)
? new OrderByOperatorDescriptor
{
SortDirection = next.SortDirection,
SourceOperand = descriptor,
SelectorBody = new MemberSelectorOperatorDescriptor
{
SourceOperand = new ParameterOperatorDescriptor {
ParameterName = selectorParameterName
},
MemberFullName = next.PropertyName
},
SelectorParameterName = selectorParameterName
}
: new ThenByOperatorDescriptor
{
SortDirection = next.SortDirection,
SourceOperand = descriptor,
SelectorBody = new MemberSelectorOperatorDescriptor
{
SourceOperand = new ParameterOperatorDescriptor {
ParameterName = selectorParameterName
},
MemberFullName = next.PropertyName
},
SelectorParameterName = selectorParameterName
};
}
));
}
private static SelectorLambdaOperatorDescriptor GetSelector(string queryableType, SortCollectionDescriptor sortDescriptor, OperatorDescriptorBase sourceOperand)
=> new SelectorLambdaOperatorDescriptor
{
Selector = CreatePagingDescriptor
(
sortDescriptor,
CreateSortBody
(
sortDescriptor,
sourceOperand
)
),
ParameterName = queryParameterName,
BodyType = queryableType,
SourceElementType = queryableType
};
private static OperatorDescriptorBase CreatePagingDescriptor(SortCollectionDescriptor sortCollectionDescriptor, OperatorDescriptorBase sortBody) => sortBody.GetSkipOperator(sortCollectionDescriptor).GetTakeOperator(sortCollectionDescriptor);
