Added PlaceholderAPI support

pom.xml

@@ -3,7 +3,7 @@
     <modelVersion>4.0.0</modelVersion>
     <groupId>de.butzlabben.world</groupId>
     <artifactId>WorldSystem</artifactId>
-    <version>2.4.4.1</version>
+    <version>2.4.4.2</version>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.build.number>-</project.build.number>
@@ -101,6 +101,10 @@
             <url>https://libraries.minecraft.net/</url>
         </repository>
 
+        <repository>
+            <id>placeholderapi</id>
+            <url>http://repo.extendedclip.com/content/repositories/placeholderapi/</url>
+        </repository>
     </repositories>
 
     <dependencies>
@@ -157,5 +161,12 @@
             <version>1.6</version>
             <scope>provided</scope>
         </dependency>
+
+        <dependency>
+            <groupId>me.clip</groupId>
+            <artifactId>placeholderapi</artifactId>
+            <version>LATEST</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 </project>

src/main/java/de/butzlabben/world/WorldSystem.java

@@ -4,6 +4,7 @@ import de.butzlabben.autoupdater.AutoUpdater;
 import de.butzlabben.world.command.*;
 import de.butzlabben.world.config.*;
 import de.butzlabben.world.listener.*;
+import de.butzlabben.world.util.PapiExtension;
 import de.butzlabben.world.wrapper.AsyncCreatorAdapter;
 import de.butzlabben.world.wrapper.CreatorAdapter;
 import de.butzlabben.world.wrapper.SystemWorld;
@@ -113,6 +114,9 @@ public class WorldSystem extends JavaPlugin {
             DependenceConfig.checkWorlds();
         }
 
+        if(Bukkit.getPluginManager().isPluginEnabled("PlaceholderAPI"))
+            new PapiExtension().register();
+
         Bukkit.getConsoleSender().sendMessage(PluginConfig.getPrefix() + "Succesfully enabled WorldSystem v" + version);
     }
 

src/main/java/de/butzlabben/world/util/PapiExtension.java

@@ -0,0 +1,57 @@
+package de.butzlabben.world.util;
+
+import de.butzlabben.world.WorldSystem;
+import de.butzlabben.world.config.DependenceConfig;
+import de.butzlabben.world.wrapper.SystemWorld;
+import de.butzlabben.world.wrapper.WorldPlayer;
+import me.clip.placeholderapi.expansion.PlaceholderExpansion;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.World;
+
+import java.util.Objects;
+
+public class PapiExtension extends PlaceholderExpansion {
+
+    WorldSystem worldSystem = WorldSystem.getInstance();
+
+    @Override
+    public String getIdentifier() {
+        return "worldsystem";
+    }
+
+    @Override
+    public String getAuthor() {
+        return "Butzlabben";
+    }
+
+    @Override
+    public String getVersion() {
+        return worldSystem.getDescription().getVersion();
+    }
+
+    @Override
+    public String onRequest(OfflinePlayer p, String params) {
+        DependenceConfig config = new DependenceConfig(p);
+        switch (params) {
+            case "has_world":
+                return new DependenceConfig(p).hasWorld() + "";
+            case "is_creator":
+               WorldPlayer player = new WorldPlayer(Objects.requireNonNull(Bukkit.getPlayer(p.getUniqueId())));
+               if(!player.isOnSystemWorld())
+                   return "false";
+               return player.isOwnerofWorld() + "";
+            case "world_name_of_player":
+                if(!config.hasWorld())
+                    return "none";
+                else
+                    return config.getWorldname();
+            case "world_of_player_loaded":
+                if(!config.hasWorld())
+                    return "none";
+                return SystemWorld.getSystemWorld(config.getWorldname()).isLoaded() + "";
+
+        }
+        return super.onRequest(p, params);
+    }
+}