T - see BinaryOperator
@FunctionalInterface public interface OptionalBinaryOperator<T> extends BiFunction<T,T,Optional<T>>
BinaryOperator that returns Optional instead of the raw value. OptionalBinaryOperator is typically obtained from ExceptionHandler.fromBinaryOperator(BinaryOperator), in which case its return value is empty when the underlying BinaryOperator throws an exception. See noexception tutorial.
| Modifier and Type | Method and Description |
|---|---|
Optional<T> |
apply(T left, T right)
Variation of BiFunction.apply(Object, Object) that returns Optional.
|
default BinaryOperator<T> |
orElse(T result)
Converts this OptionalBinaryOperator to plain BinaryOperator using default value.
|
default BinaryOperator<T> |
orElseGet(Supplier<T> source)
|
andThenOptional<T> apply(T left, T right)
BiFunction.apply(Object, Object) that returns Optional. If this OptionalBinaryOperator is obtained from ExceptionHandler.fromBinaryOperator(BinaryOperator), the Optional will be empty only if the underlying BinaryOperator throws. Otherwise the returned Optional just wraps the return value of underlying BinaryOperator (possibly null).
apply in interface BiFunction<T,T,Optional<T>>
left - see BiFunction.apply(Object, Object)
right - see BiFunction.apply(Object, Object)
Optional typically wrapping return value of BiFunction.apply(Object, Object), or an empty Optional (typically signifying an exception)
ExceptionHandler.fromBinaryOperator(BinaryOperator), BiFunction.apply(Object, Object)
default BinaryOperator<T> orElse(T result)
OptionalBinaryOperator to plain BinaryOperator using default value. The returned BinaryOperator will unwrap present value from the Optional if possible, or return result if the Optional is empty.
result - default value to return instead of an empty Optional
BinaryOperator that either unwraps Optional or returns default value
orElseGet(Supplier), Optional.orElse(Object)
default BinaryOperator<T> orElseGet(Supplier<T> source)
OptionalBinaryOperator to plain BinaryOperator using fallback Supplier. The returned BinaryOperator will unwrap present value from the Optional if possible, or fall back to calling source if the Optional is empty.
source - Supplier to query for fallback value when Optional is empty
BinaryOperator that either unwraps Optional or falls back to source
orElse(Object), Optional.orElseGet(Supplier)
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