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/* NSC -- new Scala compiler
* Copyright 2005-2013 LAMP/EPFL
* @author Paul Phillips
*/
package scala.tools.nsc
package interpreter
class AbstractOrMissingHandler[T](onError: String => Unit, value: T) extends PartialFunction[Throwable, T] {
def isDefinedAt(t: Throwable) = t match {
case _: AbstractMethodError => true
case _: NoSuchMethodError => true
case _: MissingRequirementError => true
case _: NoClassDefFoundError => true
case _ => false
}
def apply(t: Throwable) = t match {
case x @ (_: AbstractMethodError | _: NoSuchMethodError | _: NoClassDefFoundError) =>
onError("""
|Failed to initialize compiler: %s.
|This is most often remedied by a full clean and recompile.
|Otherwise, your classpath may continue bytecode compiled by
|different and incompatible versions of scala.
|""".stripMargin.format(x.getClass.getName split '.' last)
)
x.printStackTrace()
value
case x: MissingRequirementError =>
onError("""
|Failed to initialize compiler: %s not found.
|** Note that as of 2.8 scala does not assume use of the java classpath.
|** For the old behavior pass -usejavacp to scala, or if using a Settings
|** object programmatically, settings.usejavacp.value = true.""".stripMargin.format(x.req)
)
value
}
}
object AbstractOrMissingHandler {
def apply[T]() = new AbstractOrMissingHandler[T](Console println _, null.asInstanceOf[T])
}
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