say, i have one Kotlin class with annotations:
@Entity @Table(name="user") data class User (val id:Long, val name:String)
如何从@Table annotation获取name属性的值？
fun <T> tableName(c: KClass<T>):String {
// i can get the @Table annotation like this:
val t = c.annotations.find { it.annotationClass == Table::class }
// but how can i get the value of "name" attribute from t?
}
你可以简单地:
val table = c.annotations.find { it is Table } as? Table
println(table?.name)
Note, I used the is operator since the annotation has RUNTIME retention and therefore it is an actual instance of the Table annotation within the collection. But the following works for any annotation:
val table = c.annotations.find { it.annotationClass == Table::class } as? Table