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package lspace.librarian.process
import java.lang
import java.time.{Instant, LocalDate, LocalDateTime, LocalTime}
import lspace.librarian.process.traversal.Traverser
import lspace.librarian.structure.{Resource, Value}
package object computer {
object task {
def Mean(stream: Stream[Resource[_]]): Double = {
val (sum, size) = stream.map(_.value).foldLeft[(Double, Int)](0.0, 0) {
case ((sum: Double, size: Int), v: Int) => (sum + v) -> (size + 1)
case ((sum: Double, size: Int), v: Double) => (sum + v) -> (size + 1)
case ((sum: Double, size: Int), v: Long) => (sum + v) -> (size + 1)
case ((sum: Double, size: Int), _) => sum -> size
}
// if (valueStream.lengthCompare(0) == 0) lang.Double.NaN else valueStream.sum / valueStream.size
if (size == 0) lang.Double.NaN else sum / size
}
def Sum(stream: Stream[Resource[_]]): Any = {
stream
.map(_.value)
.foldLeft[Any](0) {
case (sum: Double, v: Int) => sum + v
case (sum: Double, v: Double) => sum + v
case (sum: Double, v: Long) => sum + v
case (sum: Int, v: Int) => sum + v
case (sum: Int, v: Double) => sum + v
case (sum: Int, v: Long) => sum + v
case (sum: Long, v: Int) => sum + v
case (sum: Long, v: Double) => sum + v
case (sum: Long, v: Long) => sum + v
case (sum, v) =>
throw new Exception(s"unexpected numeric type ${v.getClass}") //TODO: log warning and/or accept only a stream with numeric T's
}
// .asInstanceOf[T]
}
// stream.map(_.get.value).sum
def Max[R <: Resource[_]](stream: Stream[Traverser[R]]): Stream[Traverser[R]] = {
stream
.reduceOption[Traverser[R]] {
case (r1, r2) =>
r1.get.value -> r2.get.value match {
case (a: Int, b: Int) => if (a > b) r1 else r2
case (a: Int, b: Double) => if (a > b) r1 else r2
case (a: Int, b: Long) => if (a > b) r1 else r2
case (a: Double, b: Int) => if (a > b) r1 else r2
case (a: Double, b: Double) => if (a > b) r1 else r2
case (a: Double, b: Long) => if (a > b) r1 else r2
case (a: Long, b: Int) => if (a > b) r1 else r2
case (a: Long, b: Double) => if (a > b) r1 else r2
case (a: Long, b: Long) => if (a > b) r1 else r2
case (a: Instant, b: Instant) => if (a.isAfter(b)) r1 else r2
case (a: LocalDateTime, b: LocalDateTime) => if (a.isAfter(b)) r1 else r2
case (a: LocalDate, b: LocalDate) => if (a.isAfter(b)) r1 else r2
case (a: LocalTime, b: LocalTime) => if (a.isAfter(b)) r1 else r2
case _ =>
throw new Exception(s"unexpected numeric or temporal type ${r2.get.value.getClass}") //TODO: log warning and/or accept only a stream with numeric T's
}
}
.toStream
// if (valueStream.lengthCompare(0) == 0) lang.Double.NaN else valueStream.max
}
def Min[R <: Resource[_]](stream: Stream[Traverser[R]]): Stream[Traverser[R]] = {
stream
.reduceOption[Traverser[R]] {
case (r1, r2) =>
r1.get.value -> r2.get.value match {
case (a: Int, b: Int) => if (a < b) r1 else r2
case (a: Int, b: Double) => if (a < b) r1 else r2
case (a: Int, b: Long) => if (a < b) r1 else r2
case (a: Double, b: Int) => if (a < b) r1 else r2
case (a: Double, b: Double) => if (a < b) r1 else r2
case (a: Double, b: Long) => if (a < b) r1 else r2
case (a: Long, b: Int) => if (a < b) r1 else r2
case (a: Long, b: Double) => if (a < b) r1 else r2
case (a: Long, b: Long) => if (a < b) r1 else r2
case (a: Instant, b: Instant) => if (a.isBefore(b)) r1 else r2
case (a: LocalDateTime, b: LocalDateTime) => if (a.isBefore(b)) r1 else r2
case (a: LocalDate, b: LocalDate) => if (a.isBefore(b)) r1 else r2
case (a: LocalTime, b: LocalTime) => if (a.isBefore(b)) r1 else r2
case _ =>
throw new Exception(s"unexpected numeric or temporal type ${r2.get.value.getClass}") //TODO: log warning and/or accept only a stream with numeric T's
}
}
.toStream
// if (valueStream.lengthCompare(0) == 0) lang.Double.NaN else valueStream.min
}
}
}
