org.specs2.mock.HamcrestMatcherAdapter.scala Maven / Gradle / Ivy
package org.specs2
package mock
import org.hamcrest.{BaseMatcher, Description, TypeSafeMatcher}
import matcher._
/**
* Adapter class to use specs2 matchers as Hamcrest matchers
*/
case class HamcrestMatcherAdapter[T](m: Matcher[T]) extends BaseMatcher {
/** this variable is necessary to store the result of a match */
private var message = ""
def matches(item: Object): Boolean = matchesSafely(item: Any, m.asInstanceOf[Matcher[Any]])
/** this method used to be called when extending TypeSafeMatcher. However the final `matches` method was bypassing 'null' values */
def matchesSafely(item: T): Boolean = matchesSafely(item, m)
private def matchesSafely[A](item: A, matcher: Matcher[A]): Boolean = {
// special case for by-name arguments
// in that case we apply the Function0 to get the value
val i = if (item != null && item.isInstanceOf[Function0[_]]) item.asInstanceOf[Function0[_]].apply().asInstanceOf[A] else item
try {
matcher.apply(Expectable(i)) match {
case MatchFailure(_, ko, _, _) => message = ko(); false
case _ => true
}
// a class cast exception can happen if we tried: vet.treat(dog); there must be one(vet).treat(bird) (see issue #222)
} catch { case c: ClassCastException => false; case e: Throwable => throw e }
}
def describeTo(description: Description) {
description.appendText(message)
}
}