util

Type Members

1. case class DateTimeUTC(year: Int, month: Int, day: Int, hour: Int, minute: Int, second: Int, millis: Int = 0) extends Product with Serializable

   

   A simple structure representing a calendar date in UTC.

   A simple structure representing a calendar date in UTC.

   This class is deliberately extremely simple and delegates out to joda-time for its actual functionality; it exists solely to abstract away our choice of date and time library. (In JDK 8, it would probably make sense to use the new standard library date and time classes.)

   If you need to deal with multiple time zones or different calendars, you're probably best served by using something more sophisticated (although the from method in the companion object to convert from a org.joda.time.DateTime will convert to UTC first).

2. trait Logging extends AnyRef

   

3. trait NumericLimits[T] extends AnyRef

   

4. final class OptionalArg[A] extends AnyVal

   

   Provides idiomatic optional parameter values on top of Option, but which can be passed in as raw values, instead of having to pass in Some(value)

   Provides idiomatic optional parameter values on top of Option, but which can be passed in as raw values, instead of having to pass in Some(value)

   import io.radanalytics.silex.util.OptionalArg
   
   def possiblyFilter(data: Seq[Int], filterMax: OptionalArg[Int] = None) = {
     // Treat an OptionalArg like an Option, for idiomatic handling of unset vals as None
     if (filterMax.isEmpty) data else data.filter(_ <= filterMax.get)
   }
   
   val data = Seq(1, -1, 2)
   
   // default filterMax is None
   possiblyFilter(data) // returns data unfiltered
   
   // provide argument as (-1), instead of having to specify Some(-1)
   possiblyFilter(data, filterMax = -1) // returns Seq(-1)
   
   // Support full Option methods and implicit conversion to Option
   import OptionalArg.fullOptionSupport
   def possiblyFilterUsingMap(data: Seq[Int], filterMax: OptionalArg[Int] = None) = {
     // use the 'map' method on an OptionalArg:
     filterMax.map(t => data.filter(_ <= t)).getOrElse(data)
   }

   A

   The underlying value type.

5. sealed class SampleSink[S] extends Serializable

   

   On-line mean and variance estimates for a stream of fractional values.

   On-line mean and variance estimates for a stream of fractional values. Uses Chan's formulae.

   Type S must have a scala.math.Fractional[S] witness in scope, a NumericLimits[S] witness in scope, and a function converting from Long to S in scope. Scala provides the former and the latter for its fractional numeric types; the SampleSink companion object provides witnesses forNumericLimits[Float] and NumericLimits[Double].

6. trait TimeLens extends AnyRef

   

   A function object to convert to and from times in some particular string format