Sunday, September 18, 2011

Scala map implicit conversion into Java Properties

As it looks that there's no implicit conversion of a Scala Map (of Strings) into a Java Properties even in the latest Scala release, let's define one.
  implicit def map2Properties(map:Map[String,String]):java.util.Properties = {
    val props = new java.util.Properties()
    map foreach { case (key,value) => props.put(key, value)}

Or even in a one line fashion, using folding :
  implicit def map2Properties(map:Map[String,String]):java.util.Properties = {
    (new java.util.Properties /: map) {case (props, (k,v)) => props.put(k,v); props}

CONTEXT : Linux Gentoo / Scala 2.9.1 / Java 1.6.0_26


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