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| -rw-r--r-- | src/compiler/scala/tools/nsc/interpreter/AbstractOrMissingHandler.scala | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/src/compiler/scala/tools/nsc/interpreter/AbstractOrMissingHandler.scala b/src/compiler/scala/tools/nsc/interpreter/AbstractOrMissingHandler.scala new file mode 100644 index 0000000000..2f47685757 --- /dev/null +++ b/src/compiler/scala/tools/nsc/interpreter/AbstractOrMissingHandler.scala @@ -0,0 +1,41 @@ +/* NSC -- new Scala compiler + * Copyright 2005-2011 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 programatically, settings.usejavacp.value = true.""".stripMargin.format(x.req) + ) + value + } +} + +object AbstractOrMissingHandler { + def apply[T]() = new AbstractOrMissingHandler[T](Console println _, null.asInstanceOf[T]) +} |