Implemented linking of beacons in crafting

src/main/java/eu/ruekov/ruakij/LinkedBeaconTeleporters/linkedBeaconTeleporter/listener/OnPrepareItemCraftEvent.java

@@ -1,11 +1,37 @@
 package eu.ruekov.ruakij.LinkedBeaconTeleporters.linkedBeaconTeleporter.listener;
 
+import eu.ruekov.ruakij.LinkedBeaconTeleporters.linkedBeaconTeleporter.LinkedBeaconTeleporterItem;
+import org.bukkit.Material;
 import org.bukkit.inventory.CraftingInventory;
 import org.bukkit.inventory.InventoryView;
+import org.bukkit.inventory.ItemStack;
 
 public class OnPrepareItemCraftEvent {
 
     public static void onPrepareItemCraftEvent(CraftingInventory what, InventoryView view, boolean isRepair){
+        ItemStack[] matrix = what.getMatrix();
 
+        // Check if one of provided items is already LinkedBeaconTeleporterItem and use first if found
+        LinkedBeaconTeleporterItem lbtItem = null;
+
+        for (ItemStack item : matrix) {
+            lbtItem = LinkedBeaconTeleporterItem.getFromItemStack(item);
+            if(lbtItem != null) break;
+        }
+
+        if(lbtItem == null){
+            // If none is found, create new LinkedBeaconTeleporterItem and set as crafting-result
+            ItemStack item = new ItemStack(Material.BEACON);
+            lbtItem = new LinkedBeaconTeleporterItem(item);
+        }
+
+        // Generate ItemStack
+        ItemStack item = lbtItem.toItemStack();
+
+        // Exactly 2
+        item.setAmount(2);
+
+        // Set as crafting-result
+        what.setResult(item);
     }
 }