Kotlin中的Javax验证自定义枚举约束

import javax.validation.Constraint
import javax.validation.Payload
import kotlin.reflect.KClass

@Target(AnnotationTarget.FIELD, AnnotationTarget.PROPERTY_GETTER, AnnotationTarget.PROPERTY_SETTER)
@Retention(AnnotationRetention.RUNTIME)
@Constraint(validatedBy = [EnumValidator::class])
annotation class EnumValue(
    val enumClass: KClass<out Enum<*>>,
    val message: String = "Invalid value",
    val groups: Array<KClass<*>> = [],
    val payload: Array<KClass<out Payload>> = []
)

import javax.validation.ConstraintValidator
import javax.validation.ConstraintValidatorContext

class EnumValidator : ConstraintValidator<EnumValue, String> {
    lateinit var enumClass: KClass<out Enum<*>>

    override fun initialize(constraintAnnotation: EnumValue) {
        enumClass = constraintAnnotation.enumClass
    }

    override fun isValid(value: String?, context: ConstraintValidatorContext?): Boolean {
        if (value == null) return true // or false, depending on whether you consider null as valid
        return enumClass.java.enumConstants.any { it.name == value }
    }
}

enum class Color {
    RED, GREEN, BLUE
}

data class Product(
    @field:EnumValue(enumClass = Color::class)
    val color: String
)

fun main() {
    val product = Product(color = "YELLOW")
    // This will trigger a validation error because "YELLOW" is not a valid Color enum value
}