Added the option to not have HolographicDisplays installed.

core/pom.xml

@@ -181,5 +181,11 @@
             <version>4.1.0</version>
             <scope>compile</scope>
         </dependency>
+        <dependency>
+            <groupId>com.songoda</groupId>
+            <artifactId>craftbukkit-1-13</artifactId>
+            <version>4.1.0</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 </project>

core/src/main/java/com/songoda/epicfurnaces/EpicFurnaces.java

@@ -5,7 +5,10 @@ import com.songoda.epicfurnaces.command.CommandManager;
 import com.songoda.epicfurnaces.handlers.BlacklistHandler;
 import com.songoda.epicfurnaces.hook.CraftBukkitHook;
 import com.songoda.epicfurnaces.hooks.*;
-import com.songoda.epicfurnaces.listeners.*;
+import com.songoda.epicfurnaces.listeners.BlockListeners;
+import com.songoda.epicfurnaces.listeners.FurnaceListeners;
+import com.songoda.epicfurnaces.listeners.InteractListeners;
+import com.songoda.epicfurnaces.listeners.InventoryListeners;
 import com.songoda.epicfurnaces.managers.*;
 import com.songoda.epicfurnaces.storage.Storage;
 import com.songoda.epicfurnaces.storage.types.StorageMysql;
@@ -32,12 +35,16 @@ import org.json.simple.JSONArray;
 import org.json.simple.JSONObject;
 import org.json.simple.parser.JSONParser;
 
-import java.io.*;
+import java.io.File;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
 import java.net.URL;
 import java.net.URLConnection;
 import java.util.HashMap;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.Optional;
 
 import static com.songoda.epicfurnaces.utils.StringUtils.formatText;
 import static java.util.Arrays.asList;
@@ -69,6 +76,8 @@ public class EpicFurnaces extends JavaPlugin {
             return;
         }
 
+        Bukkit.getConsoleSender().sendMessage(formatText("Holographic displays " + (Bukkit.getPluginManager().isPluginEnabled("HolographicDisplays") ? "found, enabling support for holograms!" : "not found, holograms will not work.")));
+
         for (String name : asList("config", "data", "hooks", "blacklist", "Furnace Recipes")) {
             File file = new File(getDataFolder(), name + ".yml");
             if (!file.exists()) {
@@ -102,11 +111,14 @@ public class EpicFurnaces extends JavaPlugin {
         this.boostManager = new BoostManager(this);
         this.blacklistHandler = new BlacklistHandler(this);
         this.bukkitEnums = new BukkitEnums(this);
-        this.hologramManager = new HologramManager(this);
         this.levelManager = new LevelManager(this);
         this.hookManager = new HookManager(this);
         this.economy = getServer().getServicesManager().getRegistration(Economy.class).getProvider();
 
+        if (Bukkit.getPluginManager().isPluginEnabled("HolographicDisplays")) {
+            this.hologramManager = new HologramManager(this);
+        }
+
         checkStorage();
         levelManager.loadLevelManager();
         setupRecipes();
@@ -154,7 +166,7 @@ public class EpicFurnaces extends JavaPlugin {
         Bukkit.getConsoleSender().sendMessage(formatText("&7EpicFurnaces " + this.getDescription().getVersion() + " by &5Songoda <3&7!"));
         Bukkit.getConsoleSender().sendMessage(formatText("&7Action: &cDisabling&7..."));
         Bukkit.getConsoleSender().sendMessage(formatText("&a============================="));
-        hologramManager.clearAll();
+        getHologramManager().ifPresent(HologramManager::clearAll);
         saveToFile();
     }
 
@@ -301,8 +313,8 @@ public class EpicFurnaces extends JavaPlugin {
         return bukkitEnums;
     }
 
-    public HologramManager getHologramManager() {
+    public Optional<HologramManager> getHologramManager() {
-        return hologramManager;
+        return Optional.ofNullable(hologramManager);
     }
 
     public HookManager getHookManager() {

core/src/main/java/com/songoda/epicfurnaces/managers/FurnaceManager.java

@@ -26,7 +26,7 @@ public class FurnaceManager {
     }
 
     public FurnaceObject addFurnace(Location location, FurnaceObject furnace) {
-        instance.getHologramManager().updateHologram(furnace);
+        instance.getHologramManager().ifPresent(manager -> manager.updateHologram(furnace));
         registeredFurnaces.put(roundLocation(location), furnace);
         return furnace;
     }
@@ -40,7 +40,7 @@ public class FurnaceManager {
     }
 
     public void removeFurnace(Location location) {
-        instance.getHologramManager().remove(registeredFurnaces.remove(location));
+        instance.getHologramManager().ifPresent(manager -> manager.remove(registeredFurnaces.remove(location)));
     }
 
     public Optional<FurnaceObject> getFurnace(Location location) {
@@ -118,7 +118,12 @@ public class FurnaceManager {
                 instance.getBoostManager().addBoostToPlayer(boostData);
             }
         }
-        getFurnaces().values().forEach(furnace -> instance.getHologramManager().updateHologram(furnace));
+
+        if (!instance.getConfig().getBoolean("Main.Furnaces Have Holograms")) {
+            return;
+        }
+
+        getFurnaces().values().forEach(furnace -> instance.getHologramManager().ifPresent(manager -> manager.updateHologram(furnace)));
     }
 
     public void saveToFile() {

core/src/main/java/com/songoda/epicfurnaces/tasks/HologramTask.java

@@ -31,6 +31,6 @@ public class HologramTask extends BukkitRunnable {
 
         instance.getFurnaceManager().getFurnaces().values().stream()
                 .filter(furnace -> furnace.getLocation() != null && furnace.getLocation().getWorld() != null && furnace.getLocation().getBlock() != null)
-                .forEach(furnace -> instance.getHologramManager().updateHologram(furnace));
+                .forEach(furnace -> instance.getHologramManager().ifPresent(manager -> manager.updateHologram(furnace)));
     }
 }

core/src/main/resources/plugin.yml

@@ -3,8 +3,8 @@ version: ${project.version}
 main: com.songoda.epicfurnaces.EpicFurnaces
 authors: [Brianna, GB6]
 website: https://songoda.com/
-depend: [HolographicDisplays, Vault]
+depend: [Vault]
-softdepend: [PlotSquared, GriefPrevention, USkyBlock, SkyBlock, WorldGuard, Factions]
+softdepend: [PlotSquared, GriefPrevention, USkyBlock, SkyBlock, WorldGuard, Factions, HolographicDisplays]
 commands:
   epicfurnaces:
     description: Default command for the EpicFurnaces plugin.