I have a class ```data class Login(@get:NotBlank @...

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[rrader]

I have a class

data class Login(@get:NotBlank @get:Size(min=3) @JsonProperty(value = "login", required = true) val login: String, 
                  @get:NotBlank @JsonProperty(value = "password", required = true) val password: String)

annotations are used for validation, validation is executed after constructor
but before validation, I need to trim login and password, in order to reject values as " r " for login, because real value is "r" and size is 1, which is less than 3
how to do this in Kotlin?

[rafal]

you can try:

class Login(login: String, password: String){
    @get:NotBlank @get:Size(min=3) @JsonProperty(value = "login", required = true) val login: String = login.trim()
    @get:NotBlank @JsonProperty(value = "password", required = true) val password: String = password.trim()
}

[rafal]

however with this approach you cannot have data class

[rafal]

The other approach might be private constructor and factory method

[rafal]

data class Login private constructor(@get:NotBlank @get:Size(min=3) @JsonProperty(value = "login", required = true) val login: String,
                 @get:NotBlank @JsonProperty(value = "password", required = true) val password: String){
    companion object Factory{
        operator fun invoke(login: String, password: String) = Login(login.trim(), password.trim())
    }
}

[rafal]

You then use it as if it was constructor invocation, whereas in fact it is invoking operator invoke

[rafal]

val login = Login("login", "pass")