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config: MapParameters are back in style

This commit is contained in:
Henry Cook 2017-10-25 11:17:32 -07:00
parent f4853c4f63
commit 46751bedeb
1 changed files with 18 additions and 3 deletions
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21
src/main/scala/config/Config.scala
View File

@ -23,9 +23,17 @@ abstract class View {
}
abstract class Parameters extends View {
final def ++ (x: Parameters): Parameters = new ChainParameters(this, x)
final def alter(f: (View, View, View) => PartialFunction[Any,Any]): Parameters = Parameters(f) ++ this
final def alterPartial(f: PartialFunction[Any,Any]): Parameters = Parameters((_,_,_) => f) ++ this
final def ++ (x: Parameters): Parameters =
new ChainParameters(this, x)
final def alter(f: (View, View, View) => PartialFunction[Any,Any]): Parameters =
Parameters(f) ++ this
final def alterPartial(f: PartialFunction[Any,Any]): Parameters =
Parameters((_,_,_) => f) ++ this
final def alterMap(m: Map[Any,Any]): Parameters =
new MapParameters(m) ++ this
protected[config] def chain[T](site: View, tail: View, pname: Field[T]): Option[T]
protected[config] def find[T](pname: Field[T], site: View) = chain(site, new TerminalView, pname)
@ -69,3 +77,10 @@ private class PartialParameters(f: (View, View, View) => PartialFunction[Any,Any
if (g.isDefinedAt(pname)) Some(g.apply(pname).asInstanceOf[T]) else tail.find(pname, site)
}
}
private class MapParameters(map: Map[Any, Any]) extends Parameters {
protected[config] def chain[T](site: View, tail: View, pname: Field[T]) = {
val g = map.get(pname)
if (g.isDefined) Some(g.get.asInstanceOf[T]) else tail.find(pname, site)
}
}