/**
* Attempts to add a specific slot.
*
* @param item The item.
* @param slot The desired slot.
* @return <code>true</code> if the item was added, <code>false</code> if not.
*/
public boolean add(Item item, int slot) {
if (item == null) return false;
int newSlot = (slot > -1) ? slot : freeSlot();
if ((item.getDefinition().isStackable() || type.equals(Type.ALWAYS_STACK))
&& !type.equals(Type.NEVER_STACK)) {
if (getCount(item.getId()) > 0) {
newSlot = getSlotById(item.getId());
}
}
if (newSlot == -1) {
// the free slot is -1
return false;
}
if (get(newSlot) != null) {
newSlot = freeSlot();
}
if ((item.getDefinition().isStackable() || type.equals(Type.ALWAYS_STACK))
&& !type.equals(Type.NEVER_STACK)) {
for (int i = 0; i < items.length; i++) {
if (items[i] != null && items[i].getId() == item.getId()) {
int totalCount = item.getCount() + items[i].getCount();
if (totalCount >= Constants.MAX_ITEMS || totalCount < 1) {
return false;
}
set(i, new Item(items[i].getId(), items[i].getCount() + item.getCount()));
return true;
}
}
if (newSlot == -1) {
return false;
} else {
set(slot > -1 ? newSlot : freeSlot(), item);
return true;
}
} else {
int slots = freeSlots();
if (slots >= item.getCount()) {
boolean b = firingEvents;
firingEvents = false;
try {
for (int i = 0; i < item.getCount(); i++) {
set(slot > -1 ? newSlot : freeSlot(), new Item(item.getId()));
}
if (b) {
fireItemsChanged();
}
return true;
} finally {
firingEvents = b;
}
} else {
return false;
}
}
}
/**
* Removes an item.
*
* @param item The item to remove.
* @param preferredSlot The preferred slot.
* @param allowZero If a zero amount item should be allowed.
* @return The number of items removed.
*/
public int remove(Item item, int preferredSlot, boolean allowZero) {
int removed = 0;
if ((item.getDefinition().isStackable() || type.equals(Type.ALWAYS_STACK))
&& !type.equals(Type.NEVER_STACK)) {
int slot = getSlotById(item.getId());
Item stack = get(slot);
if (stack.getCount() > item.getCount()) {
removed = item.getCount();
set(slot, new Item(stack.getId(), stack.getCount() - item.getCount()));
} else {
removed = stack.getCount();
set(slot, allowZero ? new Item(stack.getId(), 0) : null);
}
} else {
for (int i = 0; i < item.getCount(); i++) {
int slot = getSlotById(item.getId());
if (i == 0 && preferredSlot != -1) {
Item inSlot = get(preferredSlot);
if (inSlot.getId() == item.getId()) {
slot = preferredSlot;
}
}
if (slot != -1) {
removed++;
set(slot, null);
} else {
break;
}
}
}
return removed;
}
/**
* Checks if there is room in the inventory for an item.
*
* @param item The item.
* @return <code>true</code> if so, <code>false</code> if not.
*/
public boolean hasRoomFor(Item item) {
if ((item.getDefinition().isStackable() || type.equals(Type.ALWAYS_STACK))
&& !type.equals(Type.NEVER_STACK)) {
for (int i = 0; i < items.length; i++) {
if (items[i] != null && items[i].getId() == item.getId()) {
int totalCount = item.getCount() + items[i].getCount();
if (totalCount >= Constants.MAX_ITEMS || totalCount < 1) {
return false;
}
return true;
}
}
int slot = freeSlot();
return slot != -1;
} else {
int slots = freeSlots();
return slots >= item.getCount();
}
}