CODEWITHSUNDEEP
scala
gotch4
gotch4

Reputation: 13269

How to read a stream in a simple way in scala?

To read from a stream in Java I would do the usual:

byte buff[] = new byte[10]
int len = 0;
while ((len = inputStream.read(buff)) != -1){
 ...do something with buff..
}

I know scala offers things like Source.fromInputStream but I see it a bit heavy to be honest. I know the above won't work in Scala because the assignment doesn't return the value. Is there a simple way without using the library?

Upvotes: 0

Views: 164

Answers (1)

Oleg Pyzhcov
Oleg Pyzhcov

Reputation: 7353

It is possible to close over mutable state and use Iterator.continually like so:

val buff = Array.ofDim[Byte](10)
Iterator.continually(inputStream.read(buff))
  .takeWhile(_ != -1)
  .foreach { len =>
    // do something wit buff and len
  }

being a more or less direct translation of Java code. I'd reach for the libraries based on task at hand, however.

Upvotes: 1

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