Package org.apache.thrift

Class Option<T>

java.lang.Object
org.apache.thrift.Option<T>
Direct Known Subclasses:
Option.None, Option.Some
public abstract class Option<T> extends Object
Implementation of the Option type pattern

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Class
    Description
    static class 
    Option.None<T>
    The None type, representing an absent value (instead of "null")
    static class 
    Option.Some<T>
    The Some type, representing an existence of some value

  • Constructor Summary

    Constructors
    Constructor
    Description
    Option()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static <T> Option<T>
    fromNullable(T value)
    Wraps value in an Option type, depending on whether or not value is null
    abstract T
    get()
    Get the value of the Option (if it is defined)
    abstract boolean
    isDefined()
    Whether the Option is defined or not
    static <T> Option.None<T>
    none()
     
    T
    or(T other)
    Get the contained value (if defined) or else return a default value
    static <T> Option.Some<T>
    some(T value)
    Wrap value in a Some type (NB!
    Optional<T>
    toOptional()
    Turn this Option into Java 8 Optional type

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • Option

      public Option()

  • Method Details

    • isDefined

      public abstract boolean isDefined()
      Whether the Option is defined or not
      Returns:
      true if the Option is defined (of type Some) false if the Option is not defined (of type None)

    • get

      public abstract T get()
      Get the value of the Option (if it is defined)
      Returns:
      the value
      Throws:
      IllegalStateException - if called on a None

    • or

      public T or(T other)
      Get the contained value (if defined) or else return a default value
      Parameters:
      other - what to return if the value is not defined (a None)
      Returns:
      either the value, or other if the value is not defined

    • toOptional

      public Optional<T> toOptional()
      Turn this Option into Java 8 Optional type
      Returns:
      Java 8+ Optional Type

    • fromNullable

      public static <T> Option<T> fromNullable(T value)
      Wraps value in an Option type, depending on whether or not value is null
      Type Parameters:
      T - the type of value
      Parameters:
      value - the value to wrap in Option
      Returns:
      Some(value) if value is not null, None if value is null

    • some

      public static <T> Option.Some<T> some(T value)
      Wrap value in a Some type (NB! value must not be null!)
      Type Parameters:
      T - the type of value
      Parameters:
      value - the value to wrap.
      Returns:
      a new Some(value)

    • none

      public static <T> Option.None<T> none()