org.bukkit.craftbukkit.inventory.InventoryIterator Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of walk-server Show documentation

A spigot fork to kotlin structure and news.

There is a newer version: 2.4.0

package org.bukkit.craftbukkit.inventory;

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

import java.util.ListIterator;

public class InventoryIterator implements ListIterator {
  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;
  }

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

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

  public int nextIndex() {
    return nextIndex;
  }

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

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

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

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

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

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