Add support for @Tags annotation

[setarator]

Feature
If I annotate the handler method with multiple @Tag annotations or aggregate them in @Tags, the builder will not read them (multiple @Tag after compilation will be aggregated in @Tags). I believe that the issue is in OpenAPIBuilder.buildTags method as it only tries to read Tag.class.

To Reproduce
Steps to reproduce the behavior:

• Annotate any handler method with multiple @Tag or use @Tags
  We are using springdoc 1.2.33 & spring-boot 2.2.5.RELEASE

Expected behavior
Tags are read correctly.

Also would it be possible to have control over isAutoTagClasses? I would like to tag class automatically even when handler method tags are present.

Thanks,
Tom

[bnasslahsen]

@setarator,

The support of @Tags will be available for the next release: v1.2.35.
OpenAPIBuilder.splitCamelCase, will be public.

For your second request, you can use OperationCustomizer for that:

@Component
public class OperationTagsCustomizer implements OperationCustomizer {
	@Override
	public Operation customize(Operation operation, HandlerMethod handlerMethod) {
		Set<String> tagsStr = new HashSet<>();
		tagsStr.add(OpenAPIBuilder.splitCamelCase(handlerMethod.getBeanType().getSimpleName()));
		if (!CollectionUtils.isEmpty(operation.getTags()))
			tagsStr.addAll(operation.getTags());
		operation.setTags(new ArrayList<>(tagsStr));
		return operation;
	}
}