CODEWITHSUNDEEP
scala
VictorGram
VictorGram

Reputation: 2661

Scala : How to convert some to actual

I am new to Scala and I am trying to get all attribute values of "Lr" type in a tab separated format. However, whenever I am executing "Echo" as below the program is returning :

Some(something1)    Some(something2)

Whereas, I am expecting :

something1  something2

Any clue on how to modify my code to get my expected format?

package com.......

case class Lr (
             some1_ID : Option[String],
             some2_ID : Option[String]
          )
{
   def getData(): String =
   {
      return productIterator.mkString("\t")
   }
}

object Echo {
   def main( args:Array[String] ):Unit =
   {
      val testLR = Lr(Option("something1"),Option("something2"))
      print(testLR.getData())
   }
}

Upvotes: 1

Views: 1116

Answers (2)

Sebastian Celestino
Sebastian Celestino

Reputation: 1428

It depends on what do you want to do in case some attribute is None.

If you want to discard None 

case class Lr (some1_ID : Option[String], some2_ID : Option[String]) {
 def getData: String = {
   Seq(some1_ID, some2_ID).flatten.mkString("\t")       
 }
}

If you want to use an alternative value

case class Lr(some1_ID : Option[String], some2_ID : Option[String]) {
  def getData: String = {
    Seq(some1_ID, some2_ID).map(_.getOrElse("XXX")).mkString("\t")
  }
}

If you want to use productIterator, it is a Iterator[Any], so you need pattern matching in order to work with Options.

case class Lr(some1_ID : Option[String], some2_ID : Option[String]) {
  def getData: String = {
    productIterator.collect {
      case Some(value) => value
   // case None => "ALTERNATIVE VALUE"
   // case others => others   (non Option fields)
    }.mkString("\t") 
  }
}

Upvotes: 6

Thilo
Thilo

Reputation: 262514

What do you want to print for None? Decide that, then you can do something like

 def getData: String =
    Seq( 
      some1_ID.getOrElse("-"),
      some2_ID.getOrElse("-")
    ).mkString("\t")

Upvotes: 1

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