Downhill from here

.gitignore

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+# User-specific stuff
+.idea/
+
+*.iml
+*.ipr
+*.iws
+
+# IntelliJ
+out/
+
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+
+*~
+
+# temporary files which can be created if a process still has a handle open of a deleted file
+.fuse_hidden*
+
+# KDE directory preferences
+.directory
+
+# Linux trash folder which might appear on any partition or disk
+.Trash-*
+
+# .nfs files are created when an open file is removed but is still being accessed
+.nfs*
+
+# General
+.DS_Store
+.AppleDouble
+.LSOverride
+
+# Icon must end with two \r
+Icon
+
+# Thumbnails
+._*
+
+# Files that might appear in the root of a volume
+.DocumentRevisions-V100
+.fseventsd
+.Spotlight-V100
+.TemporaryItems
+.Trashes
+.VolumeIcon.icns
+.com.apple.timemachine.donotpresent
+
+# Directories potentially created on remote AFP share
+.AppleDB
+.AppleDesktop
+Network Trash Folder
+Temporary Items
+.apdisk
+
+# Windows thumbnail cache files
+Thumbs.db
+Thumbs.db:encryptable
+ehthumbs.db
+ehthumbs_vista.db
+
+# Dump file
+*.stackdump
+
+# Folder config file
+[Dd]esktop.ini
+
+# Recycle Bin used on file shares
+$RECYCLE.BIN/
+
+# Windows Installer files
+*.cab
+*.msi
+*.msix
+*.msm
+*.msp
+
+# Windows shortcuts
+*.lnk
+
+target/
+
+pom.xml.tag
+pom.xml.releaseBackup
+pom.xml.versionsBackup
+pom.xml.next
+
+release.properties
+dependency-reduced-pom.xml
+buildNumber.properties
+.mvn/timing.properties
+.mvn/wrapper/maven-wrapper.jar
+.flattened-pom.xml
+
+# Common working directory
+run/

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <groupId>me.youhavetrouble</groupId>
+    <artifactId>EnTiddy</artifactId>
+    <version>1.0</version>
+    <packaging>jar</packaging>
+
+    <name>EnTiddy</name>
+
+    <description>A very serious library concerning entities</description>
+    <properties>
+        <java.version>1.8</java.version>
+        <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>${java.version}</source>
+                    <target>${java.version}</target>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-shade-plugin</artifactId>
+                <version>3.2.4</version>
+                <executions>
+                    <execution>
+                        <phase>package</phase>
+                        <goals>
+                            <goal>shade</goal>
+                        </goals>
+                        <configuration>
+                            <createDependencyReducedPom>false</createDependencyReducedPom>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <repositories>
+        <repository>
+            <id>papermc-repo</id>
+            <url>https://papermc.io/repo/repository/maven-public/</url>
+        </repository>
+    </repositories>
+
+    <dependencies>
+        <dependency>
+            <groupId>io.papermc.paper</groupId>
+            <artifactId>paper-api</artifactId>
+            <version>1.18.1-R0.1-SNAPSHOT</version>
+            <scope>provided</scope>
+        </dependency>
+    </dependencies>
+</project>

src/main/java/me/youhavetrouble/entiddy/Entiddy.java

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+package me.youhavetrouble.entiddy;
+
+
+import me.youhavetrouble.entiddy.SpecialEntities.JebSheep;
+import me.youhavetrouble.entiddy.SpecialEntities.Johnny;
+import me.youhavetrouble.entiddy.SpecialEntities.KillerBunny;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+public enum Entiddy {
+
+    KILLER_BUNNY(EntityType.RABBIT, new KillerBunny()),
+    JEB_SHEEP(EntityType.SHEEP, new JebSheep()),
+    JOHNNY(EntityType.VINDICATOR, new Johnny());
+
+    private final EntityType entityType;
+    private final EntiddyInterface entiddy;
+
+    Entiddy(EntityType entityType, EntiddyInterface entiddy) {
+        this.entityType = entityType;
+        this.entiddy = entiddy;
+    }
+
+    public EntityType getEntityType() {
+        return entityType;
+    }
+
+    public EntiddyInterface entiddy() {
+        return entiddy;
+    }
+
+    /**
+     * Turn entity upside down. Doesn't work on players.
+     * WARNING This overwrites entities name tag!
+     */
+    public static void upsideDown(@NotNull LivingEntity entity) {
+        if (entity instanceof Player) return;
+        entity.setCustomName("Grumm");
+    }
+
+    public static boolean isSpecialEntity(@NotNull LivingEntity entity) {
+        if (entity instanceof Player) return false;
+        for (Entiddy enTiddy: Entiddy.values()) {
+            if (enTiddy.entiddy().isInstance(entity)) return true;
+        }
+        return false;
+    }
+
+}

src/main/java/me/youhavetrouble/entiddy/EntiddyInterface.java

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+package me.youhavetrouble.entiddy;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.jetbrains.annotations.NotNull;
+
+public interface EntiddyInterface {
+
+    /**
+     * @param location Location to spawn the entity at
+     * @param spawnReason SpawnReason to set
+     * @return Spawned entity
+     */
+    Entity spawn(@NotNull Location location, @NotNull CreatureSpawnEvent.SpawnReason spawnReason);
+
+    boolean isInstance(LivingEntity entity);
+
+}

src/main/java/me/youhavetrouble/entiddy/SpecialEntities/JebSheep.java

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+package me.youhavetrouble.entiddy.SpecialEntities;
+
+import me.youhavetrouble.entiddy.EntiddyInterface;
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Rabbit;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class JebSheep implements EntiddyInterface {
+
+    @Override
+    public Entity spawn(@NotNull Location location, @NotNull CreatureSpawnEvent.SpawnReason spawnReason) {
+        if (location.getWorld() == null) {
+            throw new NullPointerException("World cannot be null");
+        }
+        return location.getWorld().spawnEntity(location, EntityType.SHEEP, spawnReason, (entity) -> entity.setCustomName("jeb_"));
+    }
+
+    @Override
+    public boolean isInstance(LivingEntity entity) {
+        if (!(entity instanceof Rabbit)) return false;
+        return entity.getCustomName() != null && entity.getCustomName().equals("jeb_");
+    }
+}

src/main/java/me/youhavetrouble/entiddy/SpecialEntities/Johnny.java

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+package me.youhavetrouble.entiddy.SpecialEntities;
+
+import me.youhavetrouble.entiddy.EntiddyInterface;
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Vindicator;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class Johnny implements EntiddyInterface {
+    @Override
+    public Entity spawn(@NotNull Location location, @NotNull CreatureSpawnEvent.SpawnReason spawnReason) {
+        if (location.getWorld() == null) {
+            throw new NullPointerException("World cannot be null");
+        }
+        return location.getWorld().spawnEntity(location, EntityType.VINDICATOR, spawnReason, (entity) -> {
+            Vindicator johnny = (Vindicator) entity;
+            johnny.setJohnny(true);
+        });
+    }
+
+    @Override
+    public boolean isInstance(LivingEntity entity) {
+        if (!(entity instanceof Vindicator)) return false;
+        return ((Vindicator) entity).isJohnny();
+    }
+}

src/main/java/me/youhavetrouble/entiddy/SpecialEntities/KillerBunny.java

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+package me.youhavetrouble.entiddy.SpecialEntities;
+
+import me.youhavetrouble.entiddy.EntiddyInterface;
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Rabbit;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class KillerBunny implements EntiddyInterface {
+
+    @Override
+    public Entity spawn(@NotNull Location location, @NotNull CreatureSpawnEvent.SpawnReason spawnReason) {
+        if (location.getWorld() == null) {
+            throw new NullPointerException("World cannot be null");
+        }
+        return location.getWorld().spawnEntity(location, EntityType.RABBIT, spawnReason, (entity) -> {
+            Rabbit rabbit = (Rabbit) entity;
+            rabbit.setRabbitType(Rabbit.Type.THE_KILLER_BUNNY);
+        });
+    }
+
+    @Override
+    public boolean isInstance(LivingEntity entity) {
+        if (!(entity instanceof Rabbit)) return false;
+        return ((Rabbit) entity).getRabbitType().equals(Rabbit.Type.THE_KILLER_BUNNY);
+    }
+}

src/main/java/me/youhavetrouble/entiddy/SpecialEntities/Toast.java

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+package me.youhavetrouble.entiddy.SpecialEntities;
+
+import me.youhavetrouble.entiddy.EntiddyInterface;
+import org.bukkit.Location;
+import org.bukkit.entity.Entity;
+import org.bukkit.entity.EntityType;
+import org.bukkit.entity.LivingEntity;
+import org.bukkit.entity.Rabbit;
+import org.bukkit.event.entity.CreatureSpawnEvent;
+import org.jetbrains.annotations.NotNull;
+
+public class Toast implements EntiddyInterface {
+
+    @Override
+    public Entity spawn(@NotNull Location location, CreatureSpawnEvent.@NotNull SpawnReason spawnReason) {
+        if (location.getWorld() == null) {
+            throw new NullPointerException("World cannot be null");
+        }
+        return location.getWorld().spawnEntity(location, EntityType.RABBIT, spawnReason, (entity) -> entity.setCustomName("Toast"));
+    }
+
+    @Override
+    public boolean isInstance(LivingEntity entity) {
+        if (!(entity instanceof Rabbit)) return false;
+        return entity.getCustomName() != null && entity.getCustomName().equals("Toast");
+    }
+}