Package com.dudko.tools.safejavastreams.extensions

Class ResultExtensions

java.lang.Object

com.dudko.tools.safejavastreams.extensions.ResultExtensions

public final class ResultExtensions
extends Object

Utility methods to convert from other types to Result.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	ResultExtensions()

Method Summary

Modifier and Type	Method	Description
static <T, E> Result<T,E>	fromChecked(Supplier<T> supplier, Function<Throwable,? extends E> errorMapper)	Wraps a supplier that may throw, producing a Result.
static <T, E> Result<T,E>	fromFuture(CompletableFuture<T> future, Function<Throwable,? extends E> errorMapper)	Converts a CompletableFuture into a Result.
static <T, E> Result<T,E>	fromOptional(Optional<T> optional, Supplier<? extends E> errorSupplier)	Converts an Optional to a Result.
static <T, E> Result<T,E>	fromSupplier(Supplier<T> supplier, Function<Throwable,? extends E> errorMapper)	Wraps a supplier that may throw, producing a Result.

Methods inherited from class java.lang.Object

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

Constructor Details

ResultExtensions

private ResultExtensions()

Method Details

fromOptional

public static <T,
E> Result<T,E> fromOptional(Optional<T> optional,
 Supplier<? extends E> errorSupplier)

Converts an Optional to a Result.

Type Parameters:

T - type of value

E - type of error

Parameters:

optional - the optional value

errorSupplier - supplier for error if value is empty

Returns:

Result with value or error

fromFuture

public static <T,
E> Result<T,E> fromFuture(CompletableFuture<T> future,
 Function<Throwable,? extends E> errorMapper)

Converts a CompletableFuture into a Result. Blocks the current thread.

Type Parameters:

T - type of value

E - type of error

Parameters:

future - the future

errorMapper - mapper from Throwable to error type

Returns:

Result from future

fromSupplier

public static <T,
E> Result<T,E> fromSupplier(Supplier<T> supplier,
 Function<Throwable,? extends E> errorMapper)

Wraps a supplier that may throw, producing a Result.

Type Parameters:

T - the result type

E - the error type

Parameters:

supplier - the supplier to execute

errorMapper - a function mapping a Throwable to an error value

Returns:

a successful Result with the supplier's value, or a failed Result with the mapped error

fromChecked

public static <T,
E> Result<T,E> fromChecked(Supplier<T> supplier,
 Function<Throwable,? extends E> errorMapper)

Wraps a supplier that may throw, producing a Result. Alias for fromSupplier(Supplier, Function).

Type Parameters:

T - type of value

E - type of error

Parameters:

supplier - the supplier

errorMapper - mapper from Throwable to error type

Returns:

Result with value or error