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package io.dico.dicore;
import org.bukkit.configuration.ConfigurationSection;
import java.util.*;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.stream.Collectors;
@FunctionalInterface
public interface Whitelist extends Predicate {
Whitelist EVERYTHING = item -> true;
Whitelist NOTHING = item -> false;
Whitelist NOT_NULL = Objects::nonNull;
static <T> Predicate<T> everythingAsPredicate() {
return (Predicate<T>) EVERYTHING;
}
static <T> Predicate<T> nothingAsPredicate() {
return (Predicate<T>) NOTHING;
}
static <T> Predicate<T> notNullAsPredicate() {
return (Predicate<T>) NOT_NULL;
}
static Whitelist only(Object item) {
return item::equals;
}
static Whitelist not(Object item) {
return o -> !item.equals(o);
}
static Whitelist only(Object item1, Object item2) {
return item -> item1.equals(item) || item2.equals(item);
}
static Whitelist not(Object item1, Object item2) {
return item -> !(item1.equals(item) || item2.equals(item));
}
static Whitelist only(Object[] objects) {
return new SetBasedWhitelist(objects, false);
}
static Whitelist not(Object[] objects) {
return new SetBasedWhitelist(objects, true);
}
static Whitelist fromConfig(ConfigurationSection section, Function<String, ?> parser) {
if (section == null) {
return NOTHING;
}
boolean blacklist = section.getBoolean("blacklist", false);
Set list = section.getStringList("listed").stream().map(parser).filter(Objects::nonNull).collect(Collectors.toSet());
switch (list.size()) {
case 0:
return blacklist ? EVERYTHING : NOTHING;
case 1: {
Iterator iterator = list.iterator();
return blacklist ? not(iterator.next()) : only(iterator.next());
}
case 2: {
Iterator iterator = list.iterator();
return blacklist ? not(iterator.next(), iterator.next()) : only(iterator.next(), iterator.next());
}
default:
Object item = list.iterator().next();
if (item instanceof Enum) {
list = EnumSet.copyOf(list);
}
return new SetBasedWhitelist(list, blacklist);
}
}
static void copyIntoConfig(ConfigurationSection target, Function<Object, String> mapper, boolean blacklist, Object... objects) {
target.set("blacklist", blacklist);
target.set("listed", Arrays.stream(objects).map(mapper).unordered().distinct().collect(Collectors.toList()));
}
@Override
default boolean test(Object o) {
return isWhitelisted(o);
}
boolean isWhitelisted(Object o);
}
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