Filtering maps in iterator - scala

Question

I have following code:
val rows: Iterator[Map[String,String]] = CSVDictReader(file.getInputStream)
val parsedProducts = rows.map(x => Product(name = x.get("NAME"), id = x.get("ID")))
And I would like to replace map entries with empty string. With a map alone I could use:
filter(_._2.trim.nonEmpty)
I cannot get my head around how to do this in a nice way without introducing some helper function to return None in case value is empty string.
Edit: In my example I have only name and id but in the real code there are easily over ten columns of data. Also, I would need to have None instead of empty string value. So name=Option("") should be replaced with name=None

Answer 1

You can filter Options as well.
Let's say your x.get("NAME") returns a Some("") or even Some(" ").
Then you may do something like this: x.get("NAME").filter(_.trim.nonEmpty)
Hope I understood your question correctly

Answer 2

something like this?
val rows: Iterator[Map[String,String]] = CSVDictReader(file.getInputStream)
val parsedProducts = for {
row <- rows
name <- row.get("NAME")
id <- row.get("ID")
} yield Product(name, id)
Here, if row.get("NAME") or row.get("ID") return None, the corresponding entry will not be yielded.

Answer 3

I'm not sure if this is what you're looking for, but the following code snippet:
val rows: Iterator[Map[String,String]] = Iterator(Map("NAME" -> " ", "ID" -> "foo"), Map("NAME" -> " ", "ID" -> ""))
val fieldNames = List("NAME","ID","ANOTHER COLUMN")
val cleanedRows = rows map { row =>
fieldNames map { fieldName =>
Map ( fieldName -> row.get(fieldName).filter (_.trim.nonEmpty) )
}
}
while(cleanedRows.hasNext) {
println(cleanedRows.next)
}
Would print out:
List(Map(NAME -> None), Map(ID -> Some(foo)), Map(ANOTHER COLUMN -> None))
List(Map(NAME -> None), Map(ID -> None), Map(ANOTHER COLUMN -> None))
So at this point cleanedRows would have the entries you need to create your Product instances.