[英]How perform reflection to find all classes that extend a base class in Scala?
我有一个DataObject类型的基类,该基类扩展了其他类。 我想从主类中找到所有类,这样就不必手工导入它们。 我该如何实现?
当前实现(导入分别扩展DataObject的每个类):
...
val dataObjects: Array[DataObject] = Array(
new ExtendedDataObject(),
new SecondExtendedDataObject(),
.
.
.
new LastExtendedDataObject(),
)
dataObjects.par.foreach(_.doSomething())
...
理想实现的示例:
...
def main(args: Array[String]): Unit = {
val dataObjects: Array[DataObject] = <method to find all classes extended by DataObject>
dataObjects.par.foreach(_.doSomething())
}
...
我不太了解Scala Reflection文档
UPDATE
使用org.reflections ,如何将dataObjects
转换为Array[DataObject]
?
...
def main(args: Array[String]): Unit = {
val reflections = new Reflections("my.package.dataobjects")
val dataObjects = reflections.getSubTypesOf(classOf[DataObject]).toArray()
}
...
根据您的答案,您需要的是:
import scala.collection.JavaConverters._
val reflections = new Reflections("my.package.dataobjects")
val dataObjects = asScalaSet(reflections.getSubTypesOf(classOf[Base])).map(_.newInstance())
如果您想使其成为不变的,那是一组可变的实例:
val immutableDataObjects = dataObjects.toSet
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