getComponent.java

getComponent.java

Map<String,Component> components;
public interface Component{
	String prettyResult();
	String getId();
}
//returns component if available, exception otherwise
public Either<Exception, Component> getComponent(String componentName){
	Optional<Component> optionalComponent = Optional.ofNullable(components.get(componentName));
	return optionalComponent
		//component available, return it using Right
		.<Either<Exception,Component>>map(c -> new Right<>(c))
		//component not avilable, return exception using Left
		.orElse(new Left<>(new Exception("Component not found: " + componentName)));
}