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• PredicateUtils.java

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devutility.internal.util.function.PredicateUtils Maven / Gradle / Ivy

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;
	}
}