early exits for attack message handler

src/engine/net/client/handlers/AttackCmdMsgHandler.java

@@ -9,6 +9,7 @@ import engine.net.client.msg.AttackCmdMsg;
 import engine.net.client.msg.ClientNetMsg;
 import engine.net.client.msg.TargetedActionMsg;
 import engine.objects.AbstractWorldObject;
+import engine.objects.Building;
 import engine.objects.Mob;
 import engine.objects.PlayerCharacter;
 import org.pmw.tinylog.Logger;
@@ -39,7 +40,6 @@ public class AttackCmdMsgHandler extends AbstractClientMsgHandler {
         msg = (AttackCmdMsg) baseMsg;
 
         int targetType;
-        AbstractWorldObject target;
 
         if (TargetedActionMsg.un2cnt == 60 || TargetedActionMsg.un2cnt == 70)
             return true;
@@ -54,26 +54,21 @@ public class AttackCmdMsgHandler extends AbstractClientMsgHandler {
             return true;
         }
 
-        targetType = msg.getTargetType();
-
-        if (targetType == Enum.GameObjectType.PlayerCharacter.ordinal()) {
-            target = PlayerCharacter.getFromCache(msg.getTargetID());
-        } else if (targetType == Enum.GameObjectType.Building.ordinal()) {
-            target = BuildingManager.getBuildingFromCache(msg.getTargetID());
-        } else if (targetType == Enum.GameObjectType.Mob.ordinal()) {
-            target = Mob.getFromCache(msg.getTargetID());
-        } else {
-            playerCharacter.setCombatTarget(null);
-            return true; //not valid type to attack
+        AbstractWorldObject target = playerCharacter.combatTarget;
+        if(target == null)
+            return true; // cannot attack a null target
+
+        switch(target.getObjectType()){
+            case NPC:
+                playerCharacter.setCombatTarget(null);
+                return true; //cannot attack NPCs
+            case Building:
+                Building targetBuilding = (Building) target;
+                if(!targetBuilding.isVulnerable() || targetBuilding.getRank() < 0)
+                    playerCharacter.setCombatTarget(null);
+                    return true;
         }
 
-        // quit of the combat target is already the current combat target
-        // or there is no combat target
-
-        if (target == null)
-            return true;
-        ;
-
         //set sources target
 
         playerCharacter.setCombatTarget(target);