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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.sys
import scala.collection.mutable
/** The internal implementation of scala.sys.Prop.
*/
private[sys] class PropImpl[T](val key: String, valueFn: String => T) extends Prop[T] {
def value: T = if (isSet) valueFn(get) else zero
def isSet = underlying contains key
def set(newValue: String): String = {
val old = if (isSet) get else null
underlying(key) = newValue
old
}
def get: String =
if (isSet) underlying(key)
else ""
def clear() = underlying -= key
/** The underlying property map, in our case always sys.props */
protected def underlying: mutable.Map[String, String] = scala.sys.props
protected def zero: T = null.asInstanceOf[T]
private def getString = if (isSet) "currently: " + get else "unset"
override def toString = "%s (%s)".format(key, getString)
}
trait PropCompanion {
self: Prop.type =>
private[sys] class BooleanPropImpl(key: String, valueFn: String => Boolean) extends PropImpl[Boolean](key, valueFn) with BooleanProp {
def enable() = this set "true"
def disable() = this.clear()
def toggle() = if (value) disable() else enable()
}
private[sys] abstract class CreatorImpl[T](f: String => T) extends Creator[T] {
def apply(key: String): Prop[T] = new PropImpl[T](key, f)
}
/** Implicit objects for the standard types. Custom ones can also be
* created by implementing Creator[T].
*/
private[sys] trait BooleanCreatorImpl extends Creator[Boolean] {
self: BooleanProp.type =>
/** As implemented in java.lang.Boolean.getBoolean. */
private def javaStyleTruth(s: String) = s.toLowerCase == "true"
def apply(key: String): BooleanProp = new BooleanPropImpl(key, javaStyleTruth)
}
}
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