com.m3.scalaflavor4j

Class Option<T>

java.lang.Object

com.m3.scalaflavor4j.Option<T>

All Implemented Interfaces:

CollectionLike<T>, Serializable

Direct Known Subclasses:

None, Some

public abstract class Option<T>
extends Object
implements CollectionLike<T>

scala.Option

See Also:

"http://www.scala-lang.org/api/2.9.1/index.html#scala.Option", Serialized Form

Constructor Summary

Constructors

Constructor and Description
Option()

Method Summary

Methods

Modifier and Type	Method and Description
static <T> Option<T>	apply(T value)
static <T> Option<T>	empty()
abstract Option<T>	filter(Function1<T,Boolean> f) Selects all elements of this sequence which satisfy a predicate.
abstract <U> Option<U>	flatMap(Function1<T,Option<U>> f) Returns the result of applying f to this Option's value if this Option is nonempty.
abstract <U> Function1<Function1<T,U>,U>	fold(U ifEmpty)
abstract <U> U	fold(U ifEmpty, Function1<T,U> f) Returns the result of applying $f to this $option's value if the $option is nonempty.
T	getOrElse(Function0<T> defaultProvider) Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.
abstract T	getOrElse(T defaultValue) Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.
abstract T	getOrNull() scala.Option#orNull() Returns the option's value if it is nonempty, or null if it is empty.
abstract boolean	isDefined() Returns true if the option is an instance of Some, false otherwise.
abstract <U> Option<U>	map(Function1<T,U> f) Builds a new collection by applying a function to all elements of this sequence.
static <T> Option<T>	none()

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.m3.scalaflavor4j.CollectionLike

foreach, isEmpty, toList

Constructor Detail

Option

public Option()

Method Detail

apply

public static <T> Option<T> apply(T value)

none

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

empty

public static <T> Option<T> empty()

getOrNull

public abstract T getOrNull()

scala.Option#orNull() Returns the option's value if it is nonempty, or null if it is empty.

getOrElse

public abstract T getOrElse(T defaultValue)

Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.

getOrElse

public T getOrElse(Function0<T> defaultProvider)
            throws Exception

Returns the option's value if the option is nonempty, otherwise return the result of evaluating default.

Throws:

Exception

isDefined

public abstract boolean isDefined()

Returns true if the option is an instance of Some, false otherwise.

filter

public abstract Option<T> filter(Function1<T,Boolean> f)

Selects all elements of this sequence which satisfy a predicate.

flatMap

public abstract <U> Option<U> flatMap(Function1<T,Option<U>> f)

Returns the result of applying f to this Option's value if this Option is nonempty.

fold

public abstract <U> U fold(U ifEmpty,
         Function1<T,U> f)

Returns the result of applying $f to this $option's value if the $option is nonempty. Otherwise, evaluates expression $ifEmpty.

fold

public abstract <U> Function1<Function1<T,U>,U> fold(U ifEmpty)

map

public abstract <U> Option<U> map(Function1<T,U> f)

Builds a new collection by applying a function to all elements of this sequence.