Is there a way to limit the size/nested of additionalProperties Map?

[KalCramer]

Hello!

I'm adding MAP_VALUES_AS_ADDITIONAL_PROPERTIES option which allows the schema to accept Map values, but I was wondering if there is a way to limit the number of entries in the map like on a List. Is this something that is currently supported and I'm doing it incorrectly?

Something like the following maybe:

@Size(max = 20)
private Map<String, Object> additionalParameters;

I would also want to make sure the values are not nested Maps. Is this something patternProperties would be able to do on top of this?

Edit: fixed wording

[CarstenWickner]

HI @KalCramer,

What the Option.MAP_VALUES_AS_ADDITIONAL_PROPERTIES does is this:

configBuilder.forTypesInGeneral()
        .withAdditionalPropertiesResolver(scope -> {
            if (scope.getType().isInstanceOf(Map.class)) {
                // within a Map<Key, Value> allow additionalProperties of the Value type
                // if no type parameters are defined, this will result in additionalProperties to be omitted (by way of returning Object.class)
                return scope.getTypeParameterFor(Map.class, 1);
            }
            return null;
        });

You'd have to handle the scenario when scope.getTypeParameterFor(Map.class, 1) returns just Object, to define an alternative sub-schema that prevents nested Maps.
The patternProperties would only allow you to restrict the keys but not the values of the Map.

Regarding your second question:
The @Size annotation on anything but a Collection is ignored out-of-the-box.
In this context, it should affect the maxProperties attribute I imagine. For that you could add something like this:

configBuilder.forFields()
        .withInstanceAttributeOverride((node, field, context) -> {
            Size annotation = field.getAnnotationConsideringFieldAndGetter(Size.class);
            if (annotation != null && x.max() < Integer.MAX_VALUE && field.getType().isInstanceOf(Map.class)) {
                node.put(context.getKeyword(SchemaKeyword.TAG_PROPERTIES_MAX), x.max());
            }
        });