public static String getSelectorTypeByCode(final int code) {
        return Arrays.stream(SelectorTypeEnum.values())
                .filter(v -> v.getCode() == code)
                .findFirst()
                .map(SelectorTypeEnum::getName).orElse(null);
    }
get selector type name by code.

@param code selector type code.
@return selector type name.
shenyu-common/src/main/java/org/apache/shenyu/common/enums/SelectorTypeEnum.java