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1.20.4 Lightweight Minecraft server

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package net.minestom.server.utils.collection;

import org.jetbrains.annotations.ApiStatus;

import java.util.AbstractList;
import java.util.Objects;
import java.util.function.IntFunction;

@ApiStatus.Internal
public final class IntMappedArray extends AbstractList {
    private final int[] elements;
    private final IntFunction function;

    public IntMappedArray(int[] elements, IntFunction function) {
        this.elements = elements;
        this.function = function;
    }

    @Override
    public R get(int index) {
        final int[] elements = this.elements;
        Objects.checkIndex(index, elements.length);
        return function.apply(elements[index]);
    }

    @Override
    public int size() {
        return elements.length;
    }
}