JarCastingNullSafe
Null safe flow for Java.
Java8:
// `country` can be null, meaning that no mapping will occur and "Unknown" will be returned
final String name = NullSafe.create(country)
.map(Country::city) // map function will never call Supplier with null argument
.map(City::street)
.map(Street::name)
.get("Unknown");
final City capitalCity = capitalCity();
final String name = NullSafe.create(country)
.map(capitalCity, Country::city) // allows to specify def values (cannot be null)
.map(City::street)
.map(Street::name)
.get("Unknown");
// NullSafe instance can be used to split the flow (safe to reference intermediate state)
final NullSafe<City> nullSafe = NullSafe.create(country)
.map(capitalCity, Country::city);
final String name = nullSafe
.map(City::street)
.map(Street::name)
.get(); // <- returns nullable if no def value was specified
final House house = nullSafe
.map(City::street)
.map(Street::house)
.get();
This utility class is not thread-safe