Scala example source code file (ClassAndJarInfo.scala)

This example Scala source code file (ClassAndJarInfo.scala) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - Scala tags/keywords

classandjarinfo, classandjarinfo, classmanifest, classmanifest, iterator, iterator, net, network, string, url, url

The Scala ClassAndJarInfo.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author  Paul Phillips
 */

package scala.tools.nsc
package io

import java.net.URL
import collection.JavaConverters._

/** A convenience class for finding the jar with the bytecode for
 *  a given Class object and similar common tasks.
 */
class ClassAndJarInfo[T: ClassManifest] {
  val man   = classManifest[T]
  def clazz = man.erasure
  
  def baseOfPath(path: String) = path indexOf '!' match {
    case -1   => path stripSuffix internalClassName
    case idx  => path take idx
  }
  
  def classUrl             = clazz getResource simpleClassName + ".class"
  def codeSource           = protectionDomain.getCodeSource()
  def internalClassName    = internalName + ".class"
  def internalName         = clazz.getName.replace('.', '/')
  def jarManifest          = new JManifest(jarManifestUrl.openStream())
  def jarManifestMainAttrs = jarManifest.getMainAttributes().asScala
  def jarManifestUrl       = new URL(baseOfPath("" + classUrl) + "!/META-INF/MANIFEST.MF")
  def locationFile         = File(locationUrl.toURI.getPath())
  def locationUrl          = if (codeSource == null) new URL("file:///") else codeSource.getLocation()
  def protectionDomain     = clazz.getProtectionDomain()
  def rootClasspath        = rootPossibles find (_.exists)
  def rootFromLocation     = Path(locationUrl.toURI.getPath())
  def rootFromResource     = Path(baseOfPath(classUrl.getPath) stripPrefix "file:")
  def rootPossibles        = Iterator(rootFromResource, rootFromLocation)
  def simpleClassName      = clazz.getName split """[$.]""" last
}