Bring back NMS

pom.xml

@@ -12,6 +12,7 @@
 		<maven.compiler.target>1.8</maven.compiler.target>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
+		<server.jars>${project.basedir}/lib</server.jars>
 	</properties>
 	<build>
 		<defaultGoal>clean package install</defaultGoal>
@@ -75,6 +76,13 @@
 			<version>1.12.2-R0.1-SNAPSHOT</version>
 			<scope>provided</scope>
 		</dependency>
+		<dependency>
+			<groupId>spigotmc.org</groupId>
+			<artifactId>library-1.12</artifactId>
+			<scope>system</scope>
+			<systemPath>${server.jars}/library-1.12.jar</systemPath>
+			<version>1.12</version>
+		</dependency>
 		<dependency>
 			<groupId>net.milkbowl.vault</groupId>
 			<artifactId>VaultAPI</artifactId>

src/main/java/us/tastybento/bskyblock/BSkyBlock.java

@@ -27,7 +27,9 @@ import us.tastybento.bskyblock.listeners.protection.IslandGuard;
 import us.tastybento.bskyblock.listeners.protection.IslandGuard1_8;
 import us.tastybento.bskyblock.listeners.protection.IslandGuard1_9;
 import us.tastybento.bskyblock.listeners.protection.NetherEvents;
+import us.tastybento.bskyblock.util.Util;
 import us.tastybento.bskyblock.util.VaultHelper;
+import us.tastybento.bskyblock.util.nms.NMSAbstraction;
 
 /**
  * Main BSkyBlock class - provides an island minigame in the sky
@@ -247,6 +249,16 @@ public class BSkyBlock extends JavaPlugin {
         return localeManager.getLocale(uuid);
     }
 
+    public NMSAbstraction getNMSHandler() {
+        NMSAbstraction nmsHandler = null;
+        try {
+            nmsHandler = Util.getNMSHandler();
+        } catch(Exception e) {
+            e.printStackTrace();
+        }
+        return nmsHandler;
+    }
+
     /**
      * Add a new sub command to BSkyBlock
      * @param argHandler - must specify either the island or admin command

src/main/java/us/tastybento/bskyblock/util/Util.java

@@ -1,6 +1,7 @@
 package us.tastybento.bskyblock.util;
 
 import java.io.File;
+import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.ParameterizedType;
 import java.lang.reflect.Type;
@@ -30,6 +31,7 @@ import org.bukkit.plugin.Plugin;
 import us.tastybento.bskyblock.BSkyBlock;
 import us.tastybento.bskyblock.config.Settings;
 import us.tastybento.bskyblock.generators.IslandWorld;
+import us.tastybento.bskyblock.util.nms.NMSAbstraction;
 import us.tastybento.bskyblock.util.placeholders.PlaceholderHandler;
 
 /**
@@ -41,6 +43,8 @@ import us.tastybento.bskyblock.util.placeholders.PlaceholderHandler;
 public class Util {
     private static BSkyBlock plugin = BSkyBlock.getPlugin();
 
+    private static NMSAbstraction nmsHandler;
+
     public static void sendMessage(CommandSender receiver, String message){
         message = PlaceholderHandler.replacePlaceholders(receiver, message);
 
@@ -51,6 +55,39 @@ public class Util {
         }
     }
 
+    /**
+     * Checks what version the server is running and picks the appropriate NMS handler, or fallback
+     * @return NMSAbstraction class
+     * @throws ClassNotFoundException
+     * @throws IllegalArgumentException
+     * @throws SecurityException
+     * @throws InstantiationException
+     * @throws IllegalAccessException
+     * @throws InvocationTargetException
+     * @throws NoSuchMethodException
+     */
+    public static NMSAbstraction getNMSHandler() throws ClassNotFoundException, IllegalArgumentException,
+            SecurityException, InstantiationException, IllegalAccessException, InvocationTargetException,
+            NoSuchMethodException {
+        String serverPackageName = plugin.getServer().getClass().getPackage().getName();
+        String pluginPackageName = plugin.getClass().getPackage().getName();
+        String version = serverPackageName.substring(serverPackageName.lastIndexOf('.') + 1);
+        Class<?> clazz;
+        try {
+            clazz = Class.forName(pluginPackageName + ".util.nms." + version + ".NMSHandler");
+        } catch (Exception e) {
+            plugin.getLogger().info("No NMS Handler found for " + version + ", falling back to Bukkit API.");
+            clazz = Class.forName(pluginPackageName + ".util.nms.fallback.NMSHandler");
+        }
+        // Check if we have a NMSAbstraction implementing class at that location.
+        if (NMSAbstraction.class.isAssignableFrom(clazz)) {
+            nmsHandler = (NMSAbstraction) clazz.getConstructor().newInstance();
+            return nmsHandler;
+        } else {
+            throw new IllegalStateException("Class " + clazz.getName() + " does not implement NMSAbstraction");
+        }
+    }
+
     /**
      * Converts a serialized location to a Location. Returns null if string is
      * empty

src/main/java/us/tastybento/bskyblock/util/nms/NMSAbstraction.java

@@ -0,0 +1,29 @@
+package us.tastybento.bskyblock.util.nms;
+
+import org.bukkit.entity.Player;
+
+public interface NMSAbstraction {
+
+    /**
+     * Send an action bar message to player
+     * @param player
+     * @param message
+     */
+    void sendActionBar(Player player, String message);
+
+
+    /**
+     * Send a title to a player
+     * @param player
+     * @param message
+     */
+    void sendTitle(Player player, String message);
+
+
+    /**
+     * Send a subtitle to a player
+     * @param player
+     * @param message
+     */
+    void sendSubtitle(Player player, String message);
+}

src/main/java/us/tastybento/bskyblock/util/nms/fallback/NMSHandler.java

@@ -0,0 +1,22 @@
+package us.tastybento.bskyblock.util.nms.fallback;
+
+import org.bukkit.entity.Player;
+import us.tastybento.bskyblock.util.nms.NMSAbstraction;
+
+public class NMSHandler implements NMSAbstraction {
+
+    @Override
+    public void sendActionBar(Player player, String message) {
+
+    }
+
+    @Override
+    public void sendTitle(Player player, String message) {
+
+    }
+
+    @Override
+    public void sendSubtitle(Player player, String message) {
+
+    }
+}

src/main/java/us/tastybento/bskyblock/util/nms/v1_12_R1/NMSHandler.java

@@ -0,0 +1,22 @@
+package us.tastybento.bskyblock.util.nms.v1_12_R1;
+
+import org.bukkit.entity.Player;
+import us.tastybento.bskyblock.util.nms.NMSAbstraction;
+
+public class NMSHandler implements NMSAbstraction {
+
+    @Override
+    public void sendActionBar(Player player, String message) {
+
+    }
+
+    @Override
+    public void sendTitle(Player player, String message) {
+
+    }
+
+    @Override
+    public void sendSubtitle(Player player, String message) {
+
+    }
+}