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Scala example source code file (SigParser.scala)

This example Scala source code file (SigParser.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

anyref, anyref, boolean, classsignature, genericsignatureformaterror, methodtypesignature, reflection, signatureparserinterface, sigparser, sigparser, string, string, sunsignatureparser, typesignature, typesignature

The Scala SigParser.scala source code

/* NSC -- new Scala compiler
 * Copyright 2005-2011 LAMP/EPFL
 * @author Paul Phillips
 */
 
package scala.tools
package reflect

import java.lang.reflect.{ GenericSignatureFormatError, Method }

/** The usual reflection song and dance to avoid referencing
 *  any sun.* classes.
 */
class SigParser {
  val SunSignatureParser = "sun.reflect.generics.parser.SignatureParser"
  private lazy val makeMethod: Method =
    try Class.forName(SunSignatureParser) getMethod "make"
    catch { case t => null }

  def make() = makeMethod.invoke(null).asInstanceOf[SignatureParserInterface]
  
  private def wrap(op: => Any) =
    try   { op ; true }
    catch { case _: GenericSignatureFormatError => false }
  
  def isParserAvailable = makeMethod != null
  def verifyClass(s: String)  = isParserAvailable && wrap(make() parseClassSig s)
  def verifyMethod(s: String) = isParserAvailable && wrap(make() parseMethodSig s)
  def verifyType(s: String)   = isParserAvailable && wrap(make() parseTypeSig s)

  type ClassSignature <: AnyRef
  type MethodTypeSignature <: AnyRef
  type TypeSignature <: AnyRef
  
  type SignatureParserInterface = {
    def isParserAvailable: Boolean
    def parseClassSig(s: String): ClassSignature
    def parseMethodSig(s: String): MethodTypeSignature
    def parseTypeSig(s: String): TypeSignature
  }
}
object SigParser extends SigParser { }

Other Scala examples (source code examples)

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