mirror of https://github.com/sbt/sbt.git
47 lines
1.3 KiB
Scala
47 lines
1.3 KiB
Scala
/* sbt -- Simple Build Tool
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* Copyright 2009 Mark Harrah
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*/
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package xsbt.boot
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import Pre._
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import java.io.{File, FileInputStream}
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import java.util.Properties
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object ResolveVersions
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{
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def apply(conf: LaunchConfiguration): LaunchConfiguration = (new ResolveVersions(conf))()
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private def trim(s: String) = if(s eq null) None else notEmpty(s.trim)
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private def notEmpty(s: String) = if(isEmpty(s)) None else Some(s)
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private def readProperties(propertiesFile: File) =
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{
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val properties = new Properties
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if(propertiesFile.exists)
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Using( new FileInputStream(propertiesFile) )( properties.load )
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properties
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}
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}
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import ResolveVersions.{readProperties, trim}
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final class ResolveVersions(conf: LaunchConfiguration) extends NotNull
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{
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private def propertiesFile = conf.boot.properties
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private lazy val properties = readProperties(propertiesFile)
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def apply(): LaunchConfiguration =
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{
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import conf._
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val scalaVersion = resolve(conf.scalaVersion)
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val appVersion = resolve(app.version)
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withVersions(scalaVersion, appVersion)
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}
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def resolve(v: Version): String =
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{
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v match
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{
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case e: Version.Explicit => e.value
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case i: Version.Implicit =>
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trim(properties.getProperty(i.name)) orElse
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i.default getOrElse
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error("No " + i.name + " specified in " + propertiesFile)
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}
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}
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} |