16 lines
443 B
Java
16 lines
443 B
Java
package eu.eudat.utilities.helpers;
|
|
|
|
import java.util.Map;
|
|
import java.util.concurrent.ConcurrentHashMap;
|
|
import java.util.function.Function;
|
|
import java.util.function.Predicate;
|
|
|
|
public class StreamDistinctBy {
|
|
|
|
public static <T> Predicate<T> distinctByKey(
|
|
Function<? super T, ?> keyExtractor) {
|
|
Map<Object, Boolean> found = new ConcurrentHashMap<>();
|
|
return t -> found.putIfAbsent(keyExtractor.apply(t), Boolean.TRUE) == null;
|
|
}
|
|
}
|