CODEWITHSUNDEEP
arraysscalavector
Sat
Sat

Reputation: 73

Load a key value file to a map in scala then load the values to a vector

New to scala. I have a key value file containing

    key1=value1~value2 
    key2=value3~value4~value5
    key3=value7~value8

I want to load it to a map from a file. I want to find and match if I receive key1 or key2 at run time. Then store the corresponding values (separated by ~) to a vector. So that I can do foreach on the vector and perform different things based on the value.

Upvotes: 1

Views: 1416

Answers (2)

tmucha
tmucha

Reputation: 709

Let's assume you have file test.txt which contains:

key1=value1~value2 
key2=value3~value4~value5
key3=value7~value8

Below code will parse and create List of Tuple with key and related to it List (it could be easily convert to Map -> just invoke toMap):

val filename = "test.txt"

val result = Source.fromFile(filename).getLines
  .map(line => {
    line.split("=") match {
      case Array(a, b) => (a, b.split("~").toList)
    }
  }).toList

println(result)

The result would be:

List((key1,List(value1, value2)), (key2,List(value3, value4, value5)), (key3,List(value7, value8)))

If you want Map you need just invoke toMap: println(result.toMap) Result for that would be:

Map(key1 -> List(value1, value2), key2 -> List(value3, value4, value5), key3 -> List(value7, value8))

Upvotes: 1

geek94
geek94

Reputation: 473

Here is the solution, though it might not be the ideal solution, though it will give you the desired output:

Read lines from the file

val list = Source.fromFile("path").getLines().toList

then do the following:

  val outPutList = list.map { data =>
 val splittedList =  data.split("=").toList
  val listOfTupple =(splittedList.head,splittedList.tail.mkString.split("~").toList)
  listOfTupple
}

outPutList.toMap

Expected Output:

 Map(key1 -> List(value1, value2), key2 -> List(value3, value4,value5))

Iterate over the values to perform the desired action.

Upvotes: 1

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