Get shop as Optional

src/main/java/client/command/commands/gm2/GmShopCommand.java

@@ -36,6 +36,6 @@ public class GmShopCommand extends Command {
 
     @Override
     public void execute(Client c, String[] params, CommandContext ctx) {
-        ctx.shopFactory().getShop(GM_SHOP_ID).sendShop(c);
+        ctx.shopFactory().getShop(GM_SHOP_ID).ifPresent(shop -> shop.sendShop(c));
     }
 }

src/main/java/net/server/channel/handlers/NPCTalkHandler.java

@@ -30,7 +30,6 @@ import net.packet.InPacket;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import scripting.npc.NPCScriptManager;
-import server.Shop;
 import server.ShopFactory;
 import server.life.NPC;
 import server.life.PlayerNPC;
@@ -106,14 +105,10 @@ public final class NPCTalkHandler extends AbstractPacketHandler {
     }
 
     private boolean hasShop(NPC npc) {
-        return shopFactory.getShop(npc.getId()) != null;
+        return shopFactory.getShop(npc.getId()).isPresent();
     }
 
     private void sendShop(NPC npc, Client c) {
-        Shop shop = shopFactory.getShop(npc.getId());
-        if (shop == null) {
-            return;
-        }
-        shop.sendShop(c);
+        shopFactory.getShop(npc.getId()).ifPresent(shop -> shop.sendShop(c));
     }
 }

src/main/java/net/server/channel/handlers/UseCashItemHandler.java

@@ -54,6 +54,7 @@ import tools.Pair;
 import java.util.ArrayList;
 import java.util.LinkedList;
 import java.util.List;
+import java.util.Optional;
 
 import static java.util.concurrent.TimeUnit.DAYS;
 import static java.util.concurrent.TimeUnit.SECONDS;
@@ -511,9 +512,9 @@ public final class UseCashItemHandler extends AbstractPacketHandler {
             }
         } else if (itemType == 545) { // MiuMiu's travel store
             if (player.getShop() == null) {
-                Shop shop = shopFactory.getShop(MIU_MIU_SHOP_ID);
-                if (shop != null) {
-                    shop.sendShop(c);
+                Optional<Shop> shop = shopFactory.getShop(MIU_MIU_SHOP_ID);
+                if (shop.isPresent()) {
+                    shop.get().sendShop(c);
                     remove(c, position, itemId);
                 }
             } else {

src/main/java/server/ShopFactory.java

@@ -37,11 +37,12 @@ import java.util.stream.Stream;
 
 /**
  * @author Matze
+ * @author Ponk
  */
 public class ShopFactory {
     private static final short MAX_QUANTITY_PER_PURCHASE = 1000; // Should really use max stack size for the given item
     private static final Set<Integer> rechargeableItemIds = rechargeableItemIds();
-    private final Cache<Integer, Shop> shops = Caffeine.newBuilder().build();
+    private final Cache<Integer, Optional<Shop>> shops = Caffeine.newBuilder().build();
     private final ShopDao shopDao;
 
     public ShopFactory(ShopDao shopDao) {
@@ -56,17 +57,17 @@ public class ShopFactory {
                 .collect(Collectors.toUnmodifiableSet());
     }
 
-    public Shop getShop(int shopId) {
+    public Optional<Shop> getShop(int shopId) {
         return shops.get(shopId, this::loadShop);
     }
 
-    private Shop loadShop(int shopId) {
+    private Optional<Shop> loadShop(int shopId) {
         Optional<database.shop.Shop> dbShop = shopDao.getShop(shopId);
         if (dbShop.isEmpty()) {
-            throw new IllegalArgumentException("Shop with id %d does not exist".formatted(shopId));
+            return Optional.empty();
         }
         List<ShopItem> items = shopDao.getShopItems(shopId);
-        return new Shop(dbShop.get().id(), dbShop.get().npcId(), fromDbShopItems(items));
+        return Optional.of(new Shop(dbShop.get().id(), dbShop.get().npcId(), fromDbShopItems(items)));
     }
 
     private List<server.ShopItem> fromDbShopItems(List<ShopItem> dbItems) {