mirror of https://github.com/Minestom/Minestom.git
72 lines
3.1 KiB
Java
72 lines
3.1 KiB
Java
package net.minestom.server.utils;
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import it.unimi.dsi.fastutil.objects.Object2ObjectArrayMap;
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import org.jetbrains.annotations.ApiStatus;
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import org.jetbrains.annotations.NotNull;
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import java.util.Collection;
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import java.util.Map;
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import java.util.function.ToIntFunction;
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@ApiStatus.Internal
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public final class ArrayUtils {
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private ArrayUtils() {
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}
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public static int[] concatenateIntArrays(int @NotNull []... arrays) {
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int totalLength = 0;
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for (int[] array : arrays) {
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totalLength += array.length;
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}
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int[] result = new int[totalLength];
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int startingPos = 0;
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for (int[] array : arrays) {
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System.arraycopy(array, 0, result, startingPos, array.length);
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startingPos += array.length;
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}
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return result;
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}
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public static <T> int[] mapToIntArray(Collection<T> collection, ToIntFunction<T> function) {
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final int size = collection.size();
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if (size == 0)
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return new int[0];
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int[] result = new int[size];
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int i = 0;
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for (T object : collection) {
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result[i++] = function.applyAsInt(object);
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}
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assert i == size;
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return result;
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}
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public static <K, V> Map<K, V> toMap(@NotNull K[] keys, @NotNull V[] values, int length) {
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assert keys.length >= length && keys.length == values.length;
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return switch (length) {
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case 0 -> Map.of();
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case 1 -> Map.of(keys[0], values[0]);
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case 2 -> Map.of(keys[0], values[0], keys[1], values[1]);
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case 3 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2]);
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case 4 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3]);
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case 5 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3], keys[4], values[4]);
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case 6 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3], keys[4], values[4], keys[5], values[5]);
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case 7 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3], keys[4], values[4], keys[5], values[5], keys[6], values[6]);
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case 8 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3], keys[4], values[4], keys[5], values[5], keys[6], values[6],
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keys[7], values[7]);
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case 9 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3], keys[4], values[4], keys[5], values[5], keys[6], values[6],
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keys[7], values[7], keys[8], values[8]);
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case 10 -> Map.of(keys[0], values[0], keys[1], values[1], keys[2], values[2],
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keys[3], values[3], keys[4], values[4], keys[5], values[5], keys[6], values[6],
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keys[7], values[7], keys[8], values[8], keys[9], values[9]);
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default -> Map.copyOf(new Object2ObjectArrayMap<>(keys, values, length));
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};
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}
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}
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