Scala example source code file (JavaPlatform.scala)

This example Scala source code file (JavaPlatform.scala) is included in my "Source Code Warehouse" project. The intent of this project is to help you more easily find Scala source code examples by using tags.

All credit for the original source code belongs to scala-lang.org; I'm just trying to make examples easier to find. (For my Scala work, see my Scala examples and tutorials.)

Scala tags/keywords

abstractfile, classpath, comparableclass, compiler, javaplatform, javaserializableclass, nsc, objectclass, option, platform, some, symbol, utilities

The JavaPlatform.scala Scala example source code

/* NSC -- new Scala compiler
 * Copyright 2005-2013 LAMP/EPFL
 * @author  Paul Phillips
 */

package scala.tools.nsc
package backend

import io.AbstractFile
import util.{ClassPath,MergedClassPath,DeltaClassPath}
import scala.tools.util.PathResolver

trait JavaPlatform extends Platform {
  val global: Global
  override val symbolTable: global.type = global
  import global._
  import definitions._

  private var currentClassPath: Option[MergedClassPath[AbstractFile]] = None

  def classPath: ClassPath[AbstractFile] = {
    if (currentClassPath.isEmpty) currentClassPath = Some(new PathResolver(settings).result)
    currentClassPath.get
  }

  /** Update classpath with a substituted subentry */
  def updateClassPath(subst: Map[ClassPath[AbstractFile], ClassPath[AbstractFile]]) =
    currentClassPath = Some(new DeltaClassPath(currentClassPath.get, subst))

  private def classEmitPhase =
    if (settings.isBCodeActive) genBCode
    else genASM

  def platformPhases = List(
    flatten,        // get rid of inner classes
    classEmitPhase  // generate .class files
  )

  lazy val externalEquals          = getDecl(BoxesRunTimeClass, nme.equals_)
  lazy val externalEqualsNumNum    = getDecl(BoxesRunTimeClass, nme.equalsNumNum)
  lazy val externalEqualsNumChar   = getDecl(BoxesRunTimeClass, nme.equalsNumChar)
  lazy val externalEqualsNumObject = getDecl(BoxesRunTimeClass, nme.equalsNumObject)

  /** We could get away with excluding BoxedBooleanClass for the
   *  purpose of equality testing since it need not compare equal
   *  to anything but other booleans, but it should be present in
   *  case this is put to other uses.
   */
  def isMaybeBoxed(sym: Symbol) = {
    (sym == ObjectClass) ||
    (sym == JavaSerializableClass) ||
    (sym == ComparableClass) ||
    (sym isNonBottomSubClass BoxedNumberClass) ||
    (sym isNonBottomSubClass BoxedCharacterClass) ||
    (sym isNonBottomSubClass BoxedBooleanClass)
  }

  def needCompile(bin: AbstractFile, src: AbstractFile) =
    src.lastModified >= bin.lastModified
}