devutility.internal.util.function.PredicateUtils Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of devutility.internal Show documentation
Show all versions of devutility.internal Show documentation
Some utilities for Java development
package devutility.internal.util.function;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;
import java.util.function.Predicate;
public class PredicateUtils {
public static Predicate distinctByKey(Function keyExtractor) {
Map map = new ConcurrentHashMap<>();
return t -> map.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
}
}