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enum mapping in lowercase fails by default #198

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@beeondev

Description

@beeondev

I have a legacy API that takes an enumeration as argument, here is a yaml fragment of OpenAPI spec :

...
components 
    schemas:
       Mode:
          type: string
          enum: 
            - a
            - b

Such enumeration should be used as string in API, but is translated to Enum with processor (why not, this is not the problem) as :

@Generated(value = "openapi-processor-spring", version = "2023.4", date = "2023-10-05T14:30:44.211810700+02:00")
public enum Mode {
    A("a"),
    B("b");
...

Internally spring use StringToEnumConverterFactory to convert the string to enumeration:

Daemon Thread [parallel-3] (Suspended)	
	owns: FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber<T,R>  (id=741)	
	owns: FluxConcatMapNoPrefetch$FluxConcatMapNoPrefetchSubscriber<T,R>  (id=742)	
	Enum<E>.valueOf(Class<T>, String) line: 268	
	StringToEnumConverterFactory$StringToEnum<T>.convert(String) line: 54	
	StringToEnumConverterFactory$StringToEnum<T>.convert(Object) line: 39	
	GenericConversionService$ConverterFactoryAdapter.convert(Object, TypeDescriptor, TypeDescriptor) line: 436	
	ConversionUtils.invokeConverter(GenericConverter, Object, TypeDescriptor, TypeDescriptor) line: 41	
	DefaultFormattingConversionService(GenericConversionService).convert(Object, TypeDescriptor, TypeDescriptor) line: 192	
	TypeConverterDelegate.convertIfNecessary(String, Object, Object, Class<T>, TypeDescriptor) line: 129	
	SimpleTypeConverter(TypeConverterSupport).convertIfNecessary(Object, Class<T>, TypeDescriptor) line: 73	
	SimpleTypeConverter(TypeConverterSupport).convertIfNecessary(Object, Class<T>, MethodParameter) line: 53	
	BindingContext$ExtendedWebExchangeDataBinder(DataBinder).convertIfNecessary(Object, Class<T>, MethodParameter) line: 729	
	RequestParamMethodArgumentResolver(AbstractNamedValueArgumentResolver).applyConversion(Object, AbstractNamedValueArgumentResolver$NamedValueInfo, MethodParameter, BindingContext, ServerWebExchange) line: 193

and it fail, because Enum.valueOf(Mode.class, "a") delegates to internal enumConstantDirectory which contains only uppercase values "A" and "B" !

So the only workaround is to inject custom converter, but this is not desirable.

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