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package kekztech;
import java.util.ArrayList;
import java.util.List;
import net.minecraft.item.ItemStack;
public class MultiItemHandler {
private int perTypeCapacity = 0;
private boolean locked = true;
private ItemStack[] items;
public MultiItemHandler() {
}
public List<String> debugPrint() {
if(items == null) {
return new ArrayList<String>();
}
final ArrayList<String> slots = new ArrayList<>();
for(int i = 0; i < items.length; i++) {
slots.add("Slot " + i + " contains " + items[i].stackSize + " " + items[i].getDisplayName());
}
return slots;
}
/**
* Adapts the internal storage to structure changes.
* In the event of structure down-sizing, all excess items
* will be dropped on the ground.
*
* @param itemTypeCapacity
*/
public void setItemTypeCapacity(int itemTypeCapacity) {
System.out.println("Configuring type capacity");
if(items.length > itemTypeCapacity) {
// Generate new smaller backing array
final ItemStack[] newItems = new ItemStack[itemTypeCapacity];
for(int i = 0; i < newItems.length; i++) {
newItems[i] = items[i];
}
// Sort out item overflow
final ItemStack[] toDrop = new ItemStack[items.length - itemTypeCapacity];
for(int i = 0; i < toDrop.length; i++) {
toDrop[i] = items[i + newItems.length - 1];
}
// TODO drop overflow items to the ground
// Swap array
items = newItems;
} else {
// Generate new larger backing array
final ItemStack[] newItems = new ItemStack[itemTypeCapacity];
for(int i = 0; i < items.length; i++) {
newItems[i] = items[i];
}
// Swap array
items = newItems;
}
}
public void setPerTypeCapacity(int perTypeCapacity) {
this.perTypeCapacity = perTypeCapacity;
}
/**
* Lock internal storage in case Item Server is not running.
*
* @param state
* Lock state.
*/
public void setLock(boolean state) {
locked = state;
}
public int getItemTypeCapacity() {
return items != null ? items.length : 0;
}
public int getPerTypeCapacity() {
return perTypeCapacity;
}
/**
* Returns the ItemStack from the specified slot.
*
* @param slot
* Storage slot number. Zero indexed.
* @return
* ItemStack from storage or null if
* storage is locked or invalid slot parameter.
*/
public ItemStack getStackInSlot(int slot) {
System.out.println("Stack in slot " + slot + " requested");
if(locked || slot >= items.length) {
return null;
} else {
return items[slot];
}
}
/**
* Inserts a new ItemStack into storage,
* but only if the slot is still unassigned.
*
* @param slot
* Storage slot number. Zero indexed.
* @param itemStack
* ItemStack to insert.
* @return
* Operation success state.
*/
public boolean insertStackInSlot(int slot, ItemStack itemStack) {
System.out.println("Inserting " + itemStack.getDisplayName() + " into " + slot);
if(itemStack == null
|| items[slot] != null
|| locked
|| slot >= items.length) {
return false;
} else {
items[slot] = itemStack;
return true;
}
}
/**
* Tries to increase the item amount in a specified slot.
*
* @param slot
* Storage slot number. Zero indexed.
* @param amount
* Amount to increase by.
* @return
* Actual amount the item amount was increased by.
*/
public int increaseStackInSlot(int slot, int amount) {
System.out.println("Increasing item in slot " + slot + " by " + amount);
if(slot >= items.length
|| locked
|| amount <= 0) {
return 0;
} else {
final int space = perTypeCapacity - items[slot].stackSize;
final int fit = Math.min(space, amount);
items[slot].stackSize += fit;
return fit;
}
}
/**
* Tries to reduce the item amount in a specified slot.
*
* @param slot
* Storage slot number. Zero indexed.
* @param amount
* Amount to decrease by.
* @return
* Actual amount the item amount was decreased by.
*/
public int reduceStackInSlot(int slot, int amount) {
System.out.println("Reducing item in slot " + slot + " by " + amount);
if(slot >= items.length
|| locked
|| amount <= 0) {
return 0;
} else {
final int available = items[slot].stackSize;
final int take = Math.min(available, amount);
items[slot].stackSize -= take;
if(take == available) {
items[slot] = null;
}
return take;
}
}
}
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