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package org.bukkit.inventory;
import org.bukkit.entity.HumanEntity;
import org.bukkit.event.inventory.InventoryType;
/**
* Represents a view linking two inventories and a single player
* (whose inventory may or may not be one of the two)
*
* Note: If you implement this interface but fail to satisfy the expected
* contracts of certain methods, there's no guarantee that the game
* will work as it should.
*/
public abstract class InventoryView {
public final static int OUTSIDE = -999;
/**
* Represents various extra properties of certain inventory windows.
*/
public enum Property {
/**
* The progress of the down-pointing arrow in a brewing inventory.
*/
BREW_TIME(0, InventoryType.BREWING),
/**
* The progress of the right-pointing arrow in a furnace inventory.
*/
COOK_TIME(0, InventoryType.FURNACE),
/**
* The progress of the flame in a furnace inventory.
*/
BURN_TIME(1, InventoryType.FURNACE),
/**
* How many total ticks the current fuel should last.
*/
TICKS_FOR_CURRENT_FUEL(2, InventoryType.FURNACE),
/**
* In an enchanting inventory, the top button's experience level value.
*/
ENCHANT_BUTTON1(0, InventoryType.ENCHANTING),
/**
* In an enchanting inventory, the middle button's experience level value.
*/
ENCHANT_BUTTON2(1, InventoryType.ENCHANTING),
/**
* In an enchanting inventory, the bottom button's experience level value.
*/
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;
}
}
/**
* Get the upper inventory involved in this transaction.
* @return the inventory
*/
public abstract Inventory getTopInventory();
/**
* Get the lower inventory involved in this transaction.
* @return the inventory
*/
public abstract Inventory getBottomInventory();
/**
* Get the player viewing.
* @return the player
*/
public abstract HumanEntity getPlayer();
/**
* Determine the type of inventory involved in the transaction. This indicates
* the window style being shown. It will never return PLAYER, since that is
* common to all windows.
* @return the inventory type
*/
public abstract InventoryType getType();
/**
* Sets one item in this inventory view by its raw slot ID.
* <p>
* Note: If slot ID -999 is chosen, it may be expected that the item is
* dropped on the ground. This is not required behaviour, however.
* @param slot The ID as returned by InventoryClickEvent.getRawSlot()
* @param item The new item to put in the slot, or null to clear it.
*/
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);
}
}
/**
* Gets one item in this inventory view by its raw slot ID.
* @param slot The ID as returned by InventoryClickEvent.getRawSlot()
* @return The item currently in the slot.
*/
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));
}
}
/**
* Sets the item on the cursor of one of the viewing players.
* @param item The item to put on the cursor, or null to remove the item on their cursor.
*/
public final void setCursor(ItemStack item) {
getPlayer().setItemOnCursor(item);
}
/**
* Get the item on the cursor of one of the viewing players.
* @return The item on the player's cursor, or null if they aren't holding one.
*/
public final ItemStack getCursor() {
return getPlayer().getItemOnCursor();
}
/**
* Converts a raw slot ID into its local slot ID into whichever of the two inventories
* the slot points to. If the raw slot refers to the upper inventory, it will be returned
* unchanged and thus be suitable for getTopInventory().getItem(); if it refers to the
* lower inventory, the output will differ from the input and be suitable for
* getBottomInventory().getItem().
* @param rawSlot The raw slot ID.
* @return The converted slot ID.
*/
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;
}
/**
* Closes the inventory view.
*/
public final void close() {
getPlayer().closeInventory();
}
/**
* Check the total number of slots in this view, combining the upper and lower inventories.
* Note though that it's possible for this to be greater than the sum of the two inventories
* if for example some slots are not being used.
* @return The total size
*/
public final int countSlots() {
return getTopInventory().getSize() + getBottomInventory().getSize();
}
public final boolean setProperty(Property prop, int value) {
return getPlayer().setWindowProperty(prop, value);
}
/**
* Get the title of this inventory window.
* @return The title.
*/
public final String getTitle() {
return getTopInventory().getTitle();
}
}
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