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Calling private methods in Scala
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| // Usage: | |
| // p(instance)('privateMethod)(arg1, arg2, arg3) | |
| class PrivateMethodCaller(x: AnyRef, methodName: String) { | |
| def apply(_args: Any*): Any = { | |
| val args = _args.map(_.asInstanceOf[AnyRef]) | |
| def _parents: Stream[Class[_]] = Stream(x.getClass) #::: _parents.map(_.getSuperclass) | |
| val parents = _parents.takeWhile(_ != null).toList | |
| val methods = parents.flatMap(_.getDeclaredMethods) | |
| val method = methods.find(_.getName == methodName).getOrElse(throw new IllegalArgumentException("Method " + methodName + " not found")) | |
| method.setAccessible(true) | |
| method.invoke(x, args : _*) | |
| } | |
| } | |
| class PrivateMethodExposer(x: AnyRef) { | |
| def apply(method: scala.Symbol): PrivateMethodCaller = new PrivateMethodCaller(x, method.name) | |
| } | |
| def p(x: AnyRef): PrivateMethodExposer = new PrivateMethodExposer(x) |
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