protected List<String> resolveAllowedValues(MemberScope<?, ?> member) {
        return this.findModelPropertyAllowableValues(member)
                .filter(allowableValues -> !ALLOWABLE_VALUES_RANGE.matcher(allowableValues).matches())
                .map(allowableValues -> Arrays.asList(allowableValues.split(", *")))
                .orElse(null);
    }
Look-up a "const"/"enum" for the given member or its associated getter/field from the {@link ApiModelProperty} annotation's
{@code allowedValues}.

@param member targeted field/method
@return list of allowed values (or {@code null})
jsonschema-module-swagger-1.5/src/main/java/com/github/victools/jsonschema/module/swagger15/SwaggerModule.java