Kotlin强制由特定类设置的属性值

class RestrictedProperty<T>(private var value: T) {
    operator fun getValue(thisRef: Any?, property: KProperty<*>): T {
        return value
    }

    operator fun setValue(thisRef: Any?, property: KProperty<*>, newValue: T) {
        if (thisRef is RestrictedClass) {
            // 在这里添加自定义逻辑，例如检查newValue是否符合特定条件
            if (newValue is String && newValue.length > 5) {
                value = newValue
            } else {
                throw IllegalArgumentException("属性值不符合要求")
            }
        } else {
            throw IllegalAccessException("只有RestrictedClass可以设置该属性")
        }
    }
}

class RestrictedClass {
    var restrictedProperty: String by RestrictedProperty("默认值")
}

fun main() {
    val obj = RestrictedClass()
    println(obj.restrictedProperty) // 输出：默认值

    obj.restrictedProperty = "Hello World"
    println(obj.restrictedProperty) // 输出：Hello World

    obj.restrictedProperty = "Hi"
    // 抛出异常：IllegalArgumentException("属性值不符合要求")
}