Package org.dmfs.jems2.optional

Class If<T>

java.lang.Object

org.dmfs.jems2.optional.If<T>

All Implemented Interfaces:

Optional<T>

public final class If<T>
extends Object
implements Optional<T>

Optional decorator restrains the presence of another Optional with a specific (independent) condition.

Example

 // only finite recurrence sets have a last occurrence!
 Optional<DateTime> lastOccurrence = new If<>(new Not<>(recurrenceSet::isInfinite), new Last<>(recurrenceSet))
 

Constructor Summary

Constructors

Constructor	Description
If(boolean condition, Optional<T> delegate)
If(Single<Boolean> condition, Optional<T> delegate)

Method Summary

Modifier and Type	Method	Description
boolean	isPresent()	Returns whether the optional value is present.
T	value()	Returns the optional value.

Methods inherited from class java.lang.Object

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

Constructor Details

If

public If(boolean condition,
 Optional<T> delegate)

If

public If(Single<Boolean> condition,
 Optional<T> delegate)

Method Details

isPresent

public boolean isPresent()

Description copied from interface: Optional

Returns whether the optional value is present.

Specified by:

isPresent in interface Optional<T>

value

public T value()

Description copied from interface: Optional

Returns the optional value.

Specified by:

value in interface Optional<T>