/FileExtraction/Java_unseen/Wind-Development_WindSpigot/WindSpigot-Server/src/main/java/org/bukkit/craftbukkit/inventory/InventoryIterator.java
package org.bukkit.craftbukkit.inventory;

import java.util.ListIterator;

import org.bukkit.inventory.Inventory;
import org.bukkit.inventory.ItemStack;

public class InventoryIterator implements ListIterator<ItemStack> {
	private final Inventory inventory;
	private int nextIndex;
	private Boolean lastDirection; // true = forward, false = backward, null = haven't moved yet

	InventoryIterator(Inventory craftInventory) {
		this.inventory = craftInventory;
		this.nextIndex = 0;
	}

	InventoryIterator(Inventory craftInventory, int index) {
		this.inventory = craftInventory;
		this.nextIndex = index;
	}

	@Override
	public boolean hasNext() {
		return nextIndex < inventory.getSize();
	}

	@Override
	public ItemStack next() {
		lastDirection = true;
		return inventory.getItem(nextIndex++);
	}

	@Override
	public int nextIndex() {
		return nextIndex;
	}

	@Override
	public boolean hasPrevious() {
		return nextIndex > 0;
	}

	@Override
	public ItemStack previous() {
		lastDirection = false;
		return inventory.getItem(--nextIndex);
	}

	@Override
	public int previousIndex() {
		return nextIndex - 1;
	}

	@Override
	public void set(ItemStack item) {
		if (lastDirection == null) {
			throw new IllegalStateException("No current item!");
		}
		int i = lastDirection ? nextIndex - 1 : nextIndex;
		inventory.setItem(i, item);
	}

	@Override
	public void add(ItemStack item) {
		throw new UnsupportedOperationException("Can't change the size of an inventory!");
	}

	@Override
	public void remove() {
		throw new UnsupportedOperationException("Can't change the size of an inventory!");
	}
}