How to convert scala Array to Java array []

Question

I have java package There is Host class and Client class that can reveive many hosts

public final class Host {
   public final String name;
   public final int port; 
} 

public class SomeClient{...
   public Client(Host... hosts) throws Exception {
  ....
}

I'm writing scala code to creating this client

//  the hosts example is hosts1,host2,host3
def getClient(hosts:String) :SomeClient ={
   val default_port:Int = 100
   val hostsArr: Array[String] =hosts.split(",")
   new Client (hostArr ???)
 }

How can I map and convert scala array of strings to Host[], so the client will be created properly?

Fatih Donmez · Accepted Answer · 2015-10-21 07:51:27Z

11

def getClient(hosts:String): SomeClient = {

    val default_port:Int = 100
    val hostsArr: Array[String] = hosts.split(",")

    //Here you map over array of string and create Host object for each item 
    val hosts = hostsArr map { hostStr =>
        val host = new Host()
        //Rest of assignment

        host
    }

    new Client(hosts:_*)
}

You can check the scala reference for repeated parameters section 4.6.2

answered Oct 21, 2015 at 7:51

Fatih Donmez

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Comments

codejitsu · Accepted Answer · 2015-10-21 05:32:12Z

0

So, actually your Scala array is already a Java array. You need to map your string array to Host array like:

val hosts = hostsArr.map { h => 
   val host = new Host()
   host.name = h
   host.port = default_port

   host
}

new Client(hosts)

edited Oct 21, 2015 at 5:32

answered Oct 21, 2015 at 4:58

codejitsu

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2 Comments

Julias Over a year ago

That's doesn't compiles with (Host... hosts) signature :-( I need to convert it to Host[] somehow ...

codejitsu Over a year ago

Hm. I think, I forgot varargs: new Client(hosts : _*) ?

Keshav Lodhi · Accepted Answer · 2020-10-22 16:45:17Z

0

I have provided the basic Scala example of the Elasticsearch client here, where it accepts many hosts/nodes(Array/List of hosts) as a parameter. I have used Java Varargs(:_*) as mentioned by @Fatih Donmez.

answered Oct 22, 2020 at 16:45

Keshav Lodhi

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