Florian Hockmann created TINKERPOP-1901:
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Summary: Enable usage of enums in more steps in Gremlin.Net
Key: TINKERPOP-1901
URL: https://issues.apache.org/jira/browse/TINKERPOP-1901
Project: TinkerPop
Issue Type: Improvement
Components: dotnet
Affects Versions: 3.3.1, 3.2.7
Reporter: Florian Hockmann
Java enums can implement interfaces and some Gremlin steps take interfaces as
arguments that are implemented by enums like {{T}} or {{P}} in Java. However,
C# enums can't have any methods and therefore also not implement interfaces.
For this reason, step arguments whose type is one of those interfaces
({{Predicate}}, {{Function}}, ...) currently have the type {{object}} in
Gremlin.Net which makes it hard for users to know what kind of values they can
use for these arguments.
This overload of the {{By}} step is a good example for this:
* In Gremlin-java:
{code:java}
public default <V> GraphTraversal<S, E> by(final Traversal<?, ?> traversal,
final Comparator<V> comparator)
{code}
* In Gremlin.Net:
{code}
public GraphTraversal<S, E> By (object function, object comparator)
{code}
[~jorgebg] [suggested two possible
solutions|https://github.com/apache/tinkerpop/pull/792#discussion_r167847541]
for this problem:
{quote} * Use a class for T (not an enum), properties like T.Id could return
instances of whatever interface we create for it. Given that java enums
functionality is more comprehensive than what C# currently supports, it makes
sense to use a class IMO.
* Generate the offending traversal methods manually.{quote}
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