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| @FunctionalInterface
public interface Comparator<T>{
int compare(T o1, T o2);
boolean equals(Object obj);
default Comparator<T> reversed(){
return Collections.reverseOrder(this);
}
default Comparator<T> thenComparing(Comparator<? super T> other){
Objects.requireNonNull(other);
return (Comparator<T> & Serializable)(c1,c2)->{
int res = compare(c1,c2);
return (res != 0) > ? res :other.compare(c1,c2);
}
}
default <U> Comparator<T> thenComparing(Function<? super T, ? extends U> keyExtractor, Comparator<? super U> keyComparator){
return thenComparing(comparing(keyExtractor,keyComparator));
}
default <U extends Comparable<? super U>> Comparator<T> thenComparing( Function<? super T, ? extends U> keyExtractor){
return thenComparing(comparing(keyExtractor));
}
default Comparator<T> thenComparing(ToIntFunction<? super T> keyExtractor){
return thenComparing(comparingInt(keyExtractor));
}
default Comparator<T> thenComparingLong(ToLongFunction<? super T> keyExtractor) {
return thenComparing(comparingLong(keyExtractor));
}
default Comparator<T> thenComparingDouble(ToDoubleFunction<? super T> keyExtractor) {
return thenComparing(comparingDouble(keyExtractor));
}
public static <T extends Comparable<? super T>> Comparator<T> reverseOrder() {
return Collections.reverseOrder();
}
public static <T extends Comparable<? super T>> Comparator<T> naturalOrder(){
return (Comparator<T>) Comparators.NaturalOrderComparator.INSTANCE;
}
public static <T> Comparator<T> nullsFirst(Comparator<? super T> comparator){
return new Comparators.NullComparator<>(true,comparator);
}
public static <T> Comparator<T> nullsLast(Comparator<? super T> comparator){
return new Comparators.NullComparator<>(false,comparator);
}
public static <T,U> Comparator<T> comparing(Function<? super T, ? extends U> keyExtractor,Comparator<? super U> keyComparator){
Objects.requireNonNull(keyExtractor);
Objects.requireNonNull(keyComparator);
return (Comparator<T> & Serializable)(c1,c2) ->keyComparator.compare(keyExtractor.apply(c1),keyExtractor.apply(c2));
}
public static <T> Comparator<T> comparingInt(ToIntFunction<? super T> keyExtractor) {
Objects.requireNonNull(keyExtractor);
return (Comparator<T> & Serializable)
(c1, c2) -> Integer.compare(keyExtractor.applyAsInt(c1), keyExtractor.applyAsInt(c2));
}
public static <T> Comparator<T> comparingLong(ToLongFunction<? super T> keyExtractor) {
Objects.requireNonNull(keyExtractor);
return (Comparator<T> & Serializable)
(c1, c2) -> Long.compare(keyExtractor.applyAsLong(c1), keyExtractor.applyAsLong(c2));
}
public static<T> Comparator<T> comparingDouble(ToDoubleFunction<? super T> keyExtractor) {
Objects.requireNonNull(keyExtractor);
return (Comparator<T> & Serializable)
(c1, c2) -> Double.compare(keyExtractor.applyAsDouble(c1), keyExtractor.applyAsDouble(c2));
}
}
|