package net.minecraft;

import java.util.Collection;
import java.util.Iterator;
import java.util.function.Function;
import java.util.function.Supplier;
import org.jetbrains.annotations.Nullable;

public class Optionull {
	@Nullable
	public static <T, R> R map(@Nullable T value, Function<T, R> mapper) {
		return (R)(value == null ? null : mapper.apply(value));
	}

	public static <T, R> R mapOrDefault(@Nullable T value, Function<T, R> mapper, R defaultValue) {
		return (R)(value == null ? defaultValue : mapper.apply(value));
	}

	public static <T, R> R mapOrElse(@Nullable T value, Function<T, R> mapper, Supplier<R> supplier) {
		return (R)(value == null ? supplier.get() : mapper.apply(value));
	}

	@Nullable
	public static <T> T first(Collection<T> collection) {
		Iterator<T> iterator = collection.iterator();
		return (T)(iterator.hasNext() ? iterator.next() : null);
	}

	public static <T> T firstOrDefault(Collection<T> collection, T defaultValue) {
		Iterator<T> iterator = collection.iterator();
		return (T)(iterator.hasNext() ? iterator.next() : defaultValue);
	}

	public static <T> T firstOrElse(Collection<T> collection, Supplier<T> supplier) {
		Iterator<T> iterator = collection.iterator();
		return (T)(iterator.hasNext() ? iterator.next() : supplier.get());
	}

	public static <T> boolean isNullOrEmpty(@Nullable T[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable boolean[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable byte[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable char[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable short[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable int[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable long[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable float[] array) {
		return array == null || array.length == 0;
	}

	public static boolean isNullOrEmpty(@Nullable double[] array) {
		return array == null || array.length == 0;
	}
}