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pom.xml

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+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+  <groupId>me.szumielxd</groupId>
+  <artifactId>MVdWPlaceholderSK</artifactId>
+  <version>1.0</version>
+  <name>MVdWPlaceholderSK</name>
+  <properties>
+		<author>szumielxd</author>
+		<mainClass>me.szumielxd.MVdWPlaceholderSK.MVdWPlaceholderSK</mainClass>
+		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+	</properties>
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.apache.maven.plugins</groupId>
+				<artifactId>maven-compiler-plugin</artifactId>
+				<version>3.8.1</version>
+				<configuration>
+					<source>1.8</source>
+					<target>1.8</target>
+				</configuration>
+			</plugin>
+			<plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>1.4</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+		</plugins>
+		<resources>
+			<resource>
+				<directory>src/main/resources</directory>
+				<filtering>true</filtering>
+				<includes>
+					<include>plugin.yml</include>
+				</includes>
+			</resource>
+			<resource>
+				<directory>src/main/resources</directory>
+				<filtering>false</filtering>
+				<excludes>
+					<exclude>**/*.java</exclude>
+					<exclude>plugin.yml</exclude>
+				</excludes>
+			</resource>
+		</resources>
+	</build>
+	<repositories>
+		<repository>
+			<id>destroystokyo-repo</id>
+			<url>https://repo.destroystokyo.com/content/repositories/snapshots/</url>
+		</repository>
+		<repository>
+			<id>mvdw-software</id>
+			<name>MVdW Public Repositories</name>
+			<url>http://repo.mvdw-software.be/content/groups/public/</url>
+		</repository>
+	</repositories>
+	<dependencies>
+		<dependency>
+			<groupId>ch.njol</groupId>
+			<artifactId>Skript</artifactId>
+			<version>2.4.1</version>
+			<scope>system</scope>
+			<systemPath>${project.basedir}/libs/Skript 2.4.1.jar</systemPath>
+		</dependency>
+		<dependency>
+			<groupId>be.maximvdw</groupId>
+			<artifactId>MVdWPlaceholderAPI</artifactId>
+			<version>3.1.1-SNAPSHOT</version>
+			<scope>provided</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.spigotmc</groupId>
+			<artifactId>spigot</artifactId>
+			<version>1.9-R0.1-SNAPSHOT</version>
+			<scope>provided</scope>
+    	</dependency>
+	</dependencies>
+</project>

src/main/java/me/szumielxd/MVdWPlaceholderSK/MVdWPlaceholderSK.java

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+package me.szumielxd.MVdWPlaceholderSK;
+
+import java.io.IOException;
+import java.lang.reflect.Field;
+
+import org.bukkit.plugin.java.JavaPlugin;
+
+import be.maximvdw.placeholderapi.PlaceholderAPI;
+import be.maximvdw.placeholderapi.internal.PlaceholderPack;
+import ch.njol.skript.Skript;
+import ch.njol.skript.SkriptAddon;
+
+public class MVdWPlaceholderSK extends JavaPlugin {
+
+
+	private static MVdWPlaceholderSK instance;
+	private SkriptAddon addon;
+
+
+	public void onEnable() {
+
+		instance = this;
+		try {
+			getSkriptInstance();
+			(this.addon = getSkriptInstance()).loadClasses("me.szumielxd.MVdWPlaceholderSK.skript", "events", "expressions");
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+
+	}
+
+
+	public static MVdWPlaceholderSK getInstance() {
+
+		if (instance == null) throw new IllegalStateException();
+		return instance;
+
+	}
+
+
+	public SkriptAddon getSkriptInstance() {
+
+		if(addon == null) addon = Skript.registerAddon(this);
+		return addon;
+
+	}
+
+
+	public static boolean isPlaceholderRegistered(String prefix) {
+		try {
+			Field f = PlaceholderAPI.class.getDeclaredField("customPlaceholders");
+			f.setAccessible(true);
+			PlaceholderPack pack = (PlaceholderPack) f.get(null);
+			f.setAccessible(false);
+			return pack.getPlaceholderReplacer("{"+prefix+"}") != null;
+		} catch (NoSuchFieldException|SecurityException | IllegalArgumentException | IllegalAccessException e) {
+			e.printStackTrace();
+		}
+		return false;
+	}
+
+
+	public static void unregisterPlaceholder(String prefix) {
+		try {
+			Field f = PlaceholderAPI.class.getDeclaredField("customPlaceholders");
+			f.setAccessible(true);
+			PlaceholderPack pack = (PlaceholderPack) f.get(null);
+			pack.removePlaceholder("{"+prefix+"}");
+			f.setAccessible(false);
+		} catch (NoSuchFieldException|SecurityException | IllegalArgumentException | IllegalAccessException e) {
+			e.printStackTrace();
+		}
+	}
+
+
+}

src/main/java/me/szumielxd/MVdWPlaceholderSK/placeholderAPI/MVdWPAPIEvent.java

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+package me.szumielxd.MVdWPlaceholderSK.placeholderAPI;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+
+public class MVdWPAPIEvent extends Event {
+
+
+	private static HandlerList handlerList = new HandlerList();
+	private Player player;
+	private String identifier;
+	private String result;
+	private String prefix;
+
+
+	@Override
+	public HandlerList getHandlers() {
+		return handlerList;
+	}
+
+
+	public static HandlerList getHandlerList() {
+		return handlerList;
+	}
+
+	public MVdWPAPIEvent(Player p, String prefix, String identifier) {
+		this.identifier = identifier;
+		this.player = p;
+		this.prefix = prefix;
+	}
+
+	public MVdWPAPIEvent(Player p, String prefix, String identifier, boolean async) {
+		super(async);
+		this.identifier = identifier;
+		this.player = p;
+		this.prefix = prefix;
+	}
+
+
+	public void setResult(String result) {
+		this.result = result;
+	}
+
+
+	public String getResult() {
+		return this.result;
+	}
+
+
+	public String getIdentifier() {
+		return this.identifier;
+	}
+
+
+	public Player getPlayer() {
+		return this.player;
+	}
+
+
+	public String getPrefix() {
+		return this.prefix;
+	}
+
+
+
+
+}

src/main/java/me/szumielxd/MVdWPlaceholderSK/placeholderAPI/MVdWPAPIListener.java

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+package me.szumielxd.MVdWPlaceholderSK.placeholderAPI;
+
+import org.bukkit.Bukkit;
+import be.maximvdw.placeholderapi.PlaceholderReplaceEvent;
+import be.maximvdw.placeholderapi.PlaceholderReplacer;
+
+public class MVdWPAPIListener implements PlaceholderReplacer {
+
+
+	private String identifier;
+
+
+	public MVdWPAPIListener(String prefix) {
+		this.identifier = prefix;
+	}
+
+
+	@Override
+	public String onPlaceholderReplace(PlaceholderReplaceEvent e) {
+		MVdWPAPIEvent event;
+		if(Bukkit.isPrimaryThread()) {
+			event = new MVdWPAPIEvent(e.getPlayer(), identifier, e.getPlaceholder());
+		}else {
+			event = new MVdWPAPIEvent(e.getPlayer(), identifier, e.getPlaceholder(), true);
+		}
+		Bukkit.getPluginManager().callEvent(event);
+		return event.getResult();
+	}
+
+}