hlipinski/ThrowingFunction

Java 8 functional types supporting checked exceptions

ThrowingFunction

Java 8 functional types supporting checked exceptions

Provides shortcut to solving checked exceptions lambda repackaging hell:

From this:

private Function<Path, Directory> createDirectory =  path -> {
    try{
        return FSDirectory.open(path);
    } catch (IOException e){
        throw new RuntimeException(e);
    }
};

To this:

private ThrowingFunction<Path, Directory, Exception> createDirectory =  path -> FSDirectory.open(path);

Maven entry:

<dependency>
  <groupId>pl.touk</groupId>
  <artifactId>throwing-function</artifactId>
  <version>1.1</version>
</dependency>

Additional features:

default Function<T, R> unchecked() {...}

Transforms ThrowingFunction into regular Function. Checked exception is wrapped in a RuntimeException. Available for all functional types.

default Function<T, Optional<R>> returningOptional() {...}

Transforms ThrowingFunction into a regular Function returning result wrapped into an Optional instance. If exception is thrown, result will contain an empty Optional instance.

default ThrowingFunction<T, Void, E> asFunction() {...}

Returns ThrowingPredicate/ThrowingSupplier/ThrowingConsumer instance as a new ThrowingFunction instance.