InventoryView.java

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package org.bukkit.inventory;

import org.bukkit.entity.HumanEntity;
import org.bukkit.event.inventory.InventoryType;

public abstract class InventoryView {
    public final static int OUTSIDE = -999;
    public enum Property {
        BREW_TIME(0, InventoryType.BREWING),
        COOK_TIME(0, InventoryType.FURNACE),
        BURN_TIME(1, InventoryType.FURNACE),
        TICKS_FOR_CURRENT_FUEL(2, InventoryType.FURNACE),
        ENCHANT_BUTTON1(0, InventoryType.ENCHANTING),
        ENCHANT_BUTTON2(1, InventoryType.ENCHANTING),
        ENCHANT_BUTTON3(2, InventoryType.ENCHANTING);
        int id;
        InventoryType style;
        private Property(int id, InventoryType appliesTo) {
            this.id = id;
            style = appliesTo;
        }

        public InventoryType getType() {
            return style;
        }

        public int getId() {
            return id;
        }
    }
    public abstract Inventory getTopInventory();

    public abstract Inventory getBottomInventory();

    public abstract HumanEntity getPlayer();

    public abstract InventoryType getType();

    public void setItem(int slot, ItemStack item) {
        if (slot != OUTSIDE) {
            if (slot < getTopInventory().getSize()) {
                getTopInventory().setItem(convertSlot(slot),item);
            } else {
                getBottomInventory().setItem(convertSlot(slot),item);
            }
        } else {
            getPlayer().getWorld().dropItemNaturally(getPlayer().getLocation(), item);
        }
    }

    public ItemStack getItem(int slot) {
        if (slot == OUTSIDE) {
            return null;
        }
        if (slot < getTopInventory().getSize()) {
            return getTopInventory().getItem(convertSlot(slot));
        } else {
            return getBottomInventory().getItem(convertSlot(slot));
        }
    }

    public final void setCursor(ItemStack item) {
        getPlayer().setItemOnCursor(item);
    }

    public final ItemStack getCursor() {
        return getPlayer().getItemOnCursor();
    }

    public final int convertSlot(int rawSlot) {
        int numInTop = getTopInventory().getSize();
        if (rawSlot < numInTop) {
            return rawSlot;
        }
        int slot = rawSlot - numInTop;
        if (getType() == InventoryType.CRAFTING) {
            if(slot < 4) return 39 - slot;
            else slot -= 4;
        }
        if (slot >= 27) slot -= 27;
        else slot += 9;
        return slot;
    }

    public final void close() {
        getPlayer().closeInventory();
    }

    public final int countSlots() {
        return getTopInventory().getSize() + getBottomInventory().getSize();
    }

    public final boolean setProperty(Property prop, int value) {
        return getPlayer().setWindowProperty(prop, value);
    }

    public final String getTitle() {
        return getTopInventory().getTitle();
    }
}