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Mastering Kotlin Essentials

Exercise: Code Generation

Explore how to create and apply a custom Validation annotation in Kotlin. Understand how to implement a ValidationProcessor to enforce rules on data class properties during runtime, including string length and email format validations.

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Problem statement

Implement a custom annotation called Validation that defines validation rules for properties of a data class called Person. Additionally, you need to create a processor called ValidationProcessor to process these annotations at runtime.

You have the following annotations:

Kotlin 1.5
@Retention(AnnotationRetention.RUNTIME)
@Target(AnnotationTarget.PROPERTY)
annotation class Validation(val minLength: Int = 0, val maxLength: Int = Int.MAX_VALUE, val validationType: ValidationType = ValidationType.NON_EMPTY)

Use the provided Person ...