Type Parameters:

T - see ToLongFunction

All Superinterfaces:

Function<T,OptionalLong>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface OptionalToLongFunction<T>
extends Function<T,OptionalLong>
```
Variation of ToLongFunction that returns OptionalLong instead of the raw value. OptionalToLongFunction is typically obtained from ExceptionHandler.fromToLongFunction(ToLongFunction), in which case its return value is empty when the underlying ToLongFunction throws an exception. See noexception tutorial.

See Also:

ExceptionHandler.fromToLongFunction(ToLongFunction), ToLongFunction

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`OptionalLong`	`apply(T value)`	Variation of `ToLongFunction.applyAsLong(Object)` that returns `OptionalLong`.
`default ToLongFunction<T>`	`orElse(long result)`	Converts this `OptionalToLongFunction` to plain `ToLongFunction` using default value.
`default ToLongFunction<T>`	`orElseGet(LongSupplier source)`	Converts this `OptionalToLongFunction` to plain `ToLongFunction` using fallback `LongSupplier`.

Methods inherited from interface java.util.function.Function
andThen, compose

- Method Detail
  - apply
```
OptionalLong apply(T value)
```
    Variation of ToLongFunction.applyAsLong(Object) that returns OptionalLong. If this OptionalToLongFunction is obtained from ExceptionHandler.fromToLongFunction(ToLongFunction), the OptionalLong will be empty only if the underlying ToLongFunction throws. Otherwise the returned OptionalLong just wraps the return value of underlying ToLongFunction.
    
    Specified by:
    
    apply in interface Function<T,OptionalLong>
    
    Parameters:
    
    value - see ToLongFunction.applyAsLong(Object)
    
    Returns:
    
    OptionalLong typically wrapping return value of ToLongFunction.applyAsLong(Object), or an empty OptionalLong (typically signifying an exception)
    
    See Also:
    
    ExceptionHandler.fromToLongFunction(ToLongFunction), ToLongFunction.applyAsLong(Object)
  - orElse
```
default ToLongFunction<T> orElse(long result)
```
    Converts this OptionalToLongFunction to plain ToLongFunction using default value. The returned ToLongFunction will unwrap present value from the OptionalLong if possible, or return result if the OptionalLong is empty.
    
    Parameters:
    
    result - default value to return instead of an empty OptionalLong
    
    Returns:
    
    plain ToLongFunction that either unwraps OptionalLong or returns default value
    
    See Also:
    
    orElseGet(LongSupplier), OptionalLong.orElse(long)
  - orElseGet
```
default ToLongFunction<T> orElseGet(LongSupplier source)
```
    Converts this OptionalToLongFunction to plain ToLongFunction using fallback LongSupplier. The returned ToLongFunction will unwrap present value from the OptionalLong if possible, or fall back to calling source if the OptionalLong is empty.
    
    Parameters:
    
    source - LongSupplier to query for fallback value when OptionalLong is empty
    
    Returns:
    
    plain ToLongFunction that either unwraps OptionalLong or falls back to source
    
    See Also:
    
    orElse(long), OptionalLong.orElseGet(LongSupplier)

Interface OptionalToLongFunction<T>

Method Summary

Methods inherited from interface java.util.function.Function

Method Detail

apply

orElse

orElseGet