ScalaX

Extension for Scala library

Examples

StringOption

import scalax._

StringOption(null) // None
StringOption("") // None
StringOption("\t\n\r ") // None
StringOption("nonempty") // Some("nonempty")
StringOption("\t\nnonempty\r ") // Some("nonempty")

asInstanceOfOpt

import scalax._

(null: Any).asInstanceOfOpt[String] // None
("string": Any).asInstanceOfOpt[String] // Some

RichEnum

Adds withNameOpt method additionally to default withName

  object Color extends Enumeration {
    val Green, Blue, Red = Value
  }

  import scalax._

  Color.withNameOpt("Green") // Some(Green)
  Color.withNameOpt("Black") // None

RichSet

Adds collate method to set. collate tries to compare sets of items in detail and returns items which were added, updated (key relative) and deleted in s2 regarding s1

  import scalax.RichSet

  case class Entity(id: Int, name: String)

  val s1 = Set(Entity(1, "1"), Entity(2, "2"), Entity(3, "3"))
  val s2 = Set(Entity(1, "1"), Entity(2, "u"), Entity(4, "4"))

  s1.collate(s2)(_.id) // Some(Set(Entity(4, "4")), Set(Entity(2, "u")), Set(3))

RichDuration

  import scalax.RichDuration
  import concurrent.duration._

  60.seconds.toCoarsest // 1.minute
  60.minutes.toCoarsest // 1.hour
  180.minutes.toCoarsest // 3.hours
  24.hours.toCoarsest // 1.day
  Duration.Inf.toCoarsest // Duration.Inf
  Duration.MinusInf.toCoarsest // Duration.MinusInf

RichPartialFunction

  import scalax.RichPartialFunction

  val pf1: PartialFunction[Int, String] = {
    case 0 => "0"
    case 1 => "1"
  }

  val pf2 = pf1.filter(_ == 0)

  pf2.isDefinedAt(0) // true
  pf2.isDefinedAt(1) // false

ExpiringCache

  import scalax.util.ExpiringCache

  val cache = new ExpiringCache[Int, Int](duration = 5,
                                        unit = TimeUnit.SECONDS,
                                        queryOverflow = 3)
  cache.put(0,0)
  cache.get(0) // Some(0)

  // after 5 seconds
  cache.get(0) // None, however it is not cleaned up yet, need one more query to go

  cache.get(0) // None, now it's cleaned up as we reached `queryOverflow` limit

FieldsMap

Method to get map of field name - value pairs, implemented with help of Scala Macros It means that method call has no performance drawback at runtime.

import scalax.FieldsMap

case class User(name: String, age: Int, address: Option[String]) extends FieldsMap
val user = User("Chuck", 30, None)
user.fieldsMap // Map("name" -> "Chuck", "age" -> 30, "address" -> None)

Setup

1. Add this repository to your pom.xml:

    <repository>
        <id>thenewmotion</id>
        <name>The New Motion Repository</name>
        <url>http://nexus.thenewmotion.com/content/repositories/releases-public</url>
    </repository>

2. Add dependency to your pom.xml:

    <dependency>
        <groupId>ua.t3hnar.scalax</groupId>
        <artifactId>scalax_2.10</artifactId>
        <version>1.6</version>
    </dependency>