org.coursera.common.collection
Enum
Related Doc:
package collection
All the symbols of the enumeration.
Gets a Enum symbol by its name.
Gets a Enum symbol by its name.
provide the enum symbol's name.
the Enum symbol matching the given name.
NoSuchElementException if no enum symbol is found for the given name
Provides a convenient way to define "ADT" based Scala enumerations (enumerations defined with case objects extending a sealed trait) while still retaining the ability to:
- Look up all the symbols of the enumeration - Look up a particular enumeration symbol given its string name
Using case objects for enumerations has some important advantages over using scala.Enumeration:
- Exhaustive pattern matching - The types used to declare enumeration symbols are 1st class scala types
Example usage:
sealed trait Direction extends EnumSymbolobject Direction extends Enum[Direction] { case object NORTH extends Direction case object SOUTH extends Direction case object EAST extends Direction case object WEST extends Direction }
scala> Direction.symbols res1: Set[Direction] = Set(NORTH, SOUTH, EAST, WEST)
scala> Direction.withName("SOUTH") res2: Direction = Direction.SOUTH