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/* NSC -- new Scala compiler
* Copyright 2006-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools
package reflect
import scala.util.PropertiesTrait
import java.security.AccessControlException
/** For placing a wrapper function around property functions.
* Motivated by places like google app engine throwing exceptions
* on property lookups.
*/
trait WrappedProperties extends PropertiesTrait {
def wrap[T](body: => T): Option[T]
protected def propCategory = "wrapped"
protected def pickJarBasedOn = this.getClass
override def propIsSet(name: String) = wrap(super.propIsSet(name)) exists (x => x)
override def propOrElse(name: String, alt: String) = wrap(super.propOrElse(name, alt)) getOrElse alt
override def setProp(name: String, value: String) = wrap(super.setProp(name, value)).orNull
override def clearProp(name: String) = wrap(super.clearProp(name)).orNull
override def envOrElse(name: String, alt: String) = wrap(super.envOrElse(name, alt)) getOrElse alt
override def envOrNone(name: String) = wrap(super.envOrNone(name)).flatten
override def envOrSome(name: String, alt: Option[String]) = wrap(super.envOrNone(name)).flatten orElse alt
def systemProperties: List[(String, String)] = {
import scala.collection.JavaConverters._
wrap {
// SI-7269,7775 Avoid `ConcurrentModificationException` and nulls if another thread modifies properties
val props = System.getProperties
val it = props.stringPropertyNames().asScala.iterator map (k => (k, props getProperty k)) filter (_._2 ne null)
it.toList
} getOrElse Nil
}
}
object WrappedProperties {
object AccessControl extends WrappedProperties {
def wrap[T](body: => T) = try Some(body) catch { case _: AccessControlException => None }
}
}
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