io.atleon.core.PresentAlo Maven / Gradle / Ivy
package io.atleon.core;
import java.util.Optional;
import java.util.function.Function;
/**
* A {@link DelegatingAlo} that adapts from an {@link Alo} exposing an {@link Optional} that is
* known to be non-empty to an Alo exposing that Optional's data type.
*
* @param The type referenced by the wrapped Alo's Optional
*/
public final class PresentAlo extends AbstractDelegatingAlo> {
private PresentAlo(Alo> delegate) {
super(delegate);
}
static PresentAlo wrap(Alo> delegate) {
return new PresentAlo<>(delegate);
}
@Override
public Alo map(Function mapper) {
return delegate.map(mapper.compose(Optional::get));
}
@Override
public T get() {
return delegate.get().orElseThrow(PresentAlo::newAbsentDelegateException);
}
private static IllegalStateException newAbsentDelegateException() {
return new IllegalStateException("Something bad happened. Wrapped Alo is absent.");
}
}