kotlinlang #announcements

Still strange, I can't really think of something that could cause it to take this long. It's not like your system is overloaded right? Or that something is taking up all disk reads?

chb0kotlin

12/22/2017, 5:58 PM

Is there a more Kotlin idiomatic way of writing this class:

class CompositeReader(private var readers: List<Reader> = listOf()) : Reader() {
    override fun close() = readers.forEach(Reader::close)

    override fun read(cbuf: CharArray?, off: Int, len: Int): Int {
        var result = -1

        if (readers.isNotEmpty()) {
            result = readers.first().read(cbuf, off, len)
            if (result == -1) {
                readers = readers.subList(1, readers.lastIndex)
                if (readers.isNotEmpty()) {
                    result = readers.first().read(cbuf, off, len)
                }
            }
        }
        return result
    }


    fun copy(reader: Reader) = CompositeReader(readers = this.readers + reader)

}

karelpeeters

12/22/2017, 9:20 PM

This is a common feture request: https://youtrack.jetbrains.com/issue/KT-14663

stkent

12/23/2017, 3:55 AM

When I call

.withDefault

on a map, the default behavior seems to be lost if I call another method (e.g.

toMutableMap

) on that map instance. Is that expected/documented behavior? I couldn't find clear rules in the docs.

evanchooly

12/23/2017, 9:01 PM

it’s likely complaining about the

jsparn

12/23/2017, 11:38 PM

Ok. So what's up with this bit here

var digitArray: MutableList<MutableList>

jkbbwr

12/24/2017, 12:30 AM

val converters = mutableMapOf<Class<*>, Load<*>>()

karelpeeters

12/24/2017, 9:44 AM

Comparator.naturalOrder<Message>()

ferrytan

12/24/2017, 5:31 PM

i see... i guess i need to modify my code, thanks @Shawn!

👍 1

dSebastien

12/25/2017, 11:11 PM

I was getting my sentence in the logical order first 😉

dSebastien

12/26/2017, 12:17 AM

Xebia got me answers, nice: https://blog.xebia.fr/2017/09/19/les-kproperty2-ou-la-reflexion-signee-kotlin/

🇫🇷 1

👍 1

mike_shysh

12/26/2017, 9:19 AM

Hi, how could affect application changing val to var in terms of memory usage?

mike_shysh

12/26/2017, 3:55 PM

Guys, Does anyone face the situation when jackson serialization partially wrong? For example:

params={"currency_info":{"iso_4217":"CAD","name":"Canadian Dollar","imerchantAccount":0,"ixrateSource":2}}

instead if

params={"currency_info":{"iso_4217":"CAD","name":"Canadian Dollar","i_merchant_account":0,"i_xrate_source":2}}

Here is the data class

data class CurrencyInfo(
		@JsonProperty("currency_info") val currencyInfo: CurrencyInfoItem?
)

@JsonInclude(JsonInclude.Include.NON_NULL)
data class CurrencyInfoItem(
		@JsonProperty("iso_4217") val iso4217: String?,
		@JsonProperty("name") val name: String?,
		@JsonProperty("name_major") val nameMajor: String?,
		@JsonProperty("name_minor") val nameMinor: String?,
		@JsonProperty("i_ma_currency") val iMaCurrency: Int?,
		@JsonProperty("i_merchant_account") val iMerchantAccount: Int?,
		@JsonProperty("i_x_rate_source") val iXRateSource: Int?,
		@JsonProperty("base_units") val baseUnits: Double?,
		@JsonProperty("min_allowed_payment") val minAllowedPayment: Int?,
		@JsonProperty("decimal_digits") val decimalDigits: Int?,
		@JsonProperty("is_used") val isUsed: Boolean?
)

karelpeeters

12/26/2017, 4:18 PM

buildSequence(::getThingBlocking).forEach { ... }

lewik

12/26/2017, 7:43 PM

Did anybody faces

An exception occurs during Evaluate Expression Action : Back-end (JVM) Internal error: No implClassName for public expect fun kotlin.Array<out kotlin.Byte>.toByteArray(): kotlin.ByteArray defined in kotlin.collections[DeserializedSimpleFunctionDescriptor...

exception? In

public expect fun Array<out Byte>.toByteArray(): ByteArray

called on Byte[] size 78

groostav

12/27/2017, 7:01 AM

well this is pretty frustraiting. The only thing I could find to do was go into

C:\Users\Geoff\.IntelliJIdea2017.3\config\plugins\Kotlin

deleting files and copying them over from the zip for 1.1.60 downloaded on the archives https://plugins.jetbrains.com/plugin/6954-kotlin

Erfan

12/27/2017, 2:57 PM

why is it so?

irus

12/27/2017, 3:07 PM

Huh, so I have to use hack:

inline fun <reified T : Any?> sample() {
    println("Is nullable: ${isNullable<T>()}")
}

inline fun <reified T : Any?> isNullable(): Boolean {
    return try {
        null as T
        true
    } catch (e: Exception) {
        false
    }
}

fun main(args: Array<String>) {
    sample<String?>()
    sample<String>()
}

herlevsen

12/27/2017, 4:42 PM

Alright. If i use a secondary constructor i have to provide defaults for the non-nullable fields, which feels wrong to me. And the init block is just extra boilerplate, that i would rather not type. Would be cool if there was some way to explicitly call the setter from the primary constructor

mike_shysh

12/27/2017, 5:34 PM

dataIds.put(cc.customerClassInfo?.name, ccResponse.iCustomerClass)

qwert_ukg

12/28/2017, 7:19 AM

Which modifier should be used for declaring for using inside package only?

altmind

12/28/2017, 11:57 AM

this gives me "Smart cast not possible: t is a mutable property that can change over time"

mike_shysh

12/28/2017, 12:15 PM

Hi, please help me with this strange behaviour) I use testNG, and my lateinit variable is not initialized in @ BeforeSuit

open class BaseTest {
    lateinit var testDataConst: MutableMap<String?,Int?>

    @BeforeSuite
    fun setup() {
        testDataConst = prepareBaseData(conf[system.user],conf[system.password])
        println(testDataConst) <<< here testDataConst is initialized
    }

But in Test class testDataConst is uninitialized

class AddCustomer : BaseTest() {
    @ Test
    fun addCustomer() {
        println(testDataConst)  <<< Here it is an error
    }
}

How could I solve it?

rkeazor

12/28/2017, 5:39 PM

well if you work on a codebase thats both java and kotlin , you will eventually run into this !! , 7 times out of 10

bod

12/28/2017, 6:00 PM

you should know better than the compiler 🙂

😂 1

groostav

12/29/2017, 2:00 AM

I'd really really like to know (because that application architecture is increasingly looking better to us)

nil2l

12/29/2017, 10:15 AM

I got this exception:

kotlin.reflect.jvm.internal.KotlinReflectionInternalError: Introspecting local functions, lambdas, anonymous functions and local variables is not yet fully supported in Kotlin reflection

In function

toString()

of a data class. The data class contains a lambda. Do I need to override

toString()

to exclude the lambda? Or lambdas are not allowed in data classes at all?

:stackoverflow: 1

Roberto Fernandez

12/29/2017, 12:44 PM

hi guys, i have a simple question, i’ve overrided a class that exposes a method

protected Class getPrototypeClass(T content) {

With this code

override fun getPrototypeClass(content: AlfredElement): Class<*> {
        return when (content) {
            is Category -> AlfredCategoryRenderer::class.java
            is Suggestion -> AlfredSuggestionElement::class.java
        }
    }

And AlfredCategoryRenderer is a class with this type

: Renderer<AlfredElement>()

So, how can i tell kotlin compiler something like i can do i java which is tell the method getPrototypeClass will return a class that is Something like extends AlfredElement?

Andreas Sinz

12/29/2017, 1:17 PM

@Roberto Fernandez how do you tell java that?

:thread-please: 1

Title

Andreas Sinz

12/29/2017, 1:17 PM

@Roberto Fernandez how do you tell java that?

:thread-please: 1

marcinmoskala

12/29/2017, 2:03 PM

Check my answer above. In think that the answer to your question is

Class<? extends Renderer>

Andreas Sinz

12/29/2017, 2:35 PM

i'm just wondering what exactly he is trying to achieve

Roberto Fernandez

12/29/2017, 3:07 PM

Class<? extends Whatever>

exactly would be Class<? extends AlfredElement>

I’m not sure because is not code that is java and it’s being moved to kotlin, so i guess that code should work in java, but not sure about

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