Added EntityUtils

Author: mouse0w0

src/main/java/team/unstudio/udpl/util/EntityUtils.java

@@ -0,0 +1,64 @@
+package team.unstudio.udpl.util;
+
+import java.lang.reflect.InvocationTargetException;
+import java.util.UUID;
+
+import javax.annotation.Nonnull;
+import javax.annotation.Nullable;
+
+import org.apache.commons.lang.Validate;
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.inventory.ItemStack;
+
+import com.comphenix.protocol.PacketType;
+import com.comphenix.protocol.ProtocolLibrary;
+import com.comphenix.protocol.ProtocolManager;
+import com.comphenix.protocol.events.PacketContainer;
+import com.google.common.base.Strings;
+
+public final class EntityUtils {
+
+	private EntityUtils(){}
+	
+	private static final ProtocolManager protocolManager = ProtocolLibrary.getProtocolManager();
+	private static int nextEntityID = Integer.MAX_VALUE;
+	
+	public Result sendFakeItemEntity(@Nonnull Player player,@Nonnull ItemStack itemStack,@Nonnull Location location,@Nullable String displayName){
+		Validate.notNull(player);
+		Validate.notNull(itemStack);
+		Validate.notNull(location);
+		
+		int entityID = nextEntityID--;
+		PacketContainer spawnEntityLiving = protocolManager.createPacket(PacketType.Play.Server.SPAWN_ENTITY_LIVING);
+		spawnEntityLiving.getIntegers().write(0, entityID); //Entity ID
+		spawnEntityLiving.getUUIDs().write(0, UUID.randomUUID()); //Entity UUID
+		spawnEntityLiving.getBytes().write(0, (byte) 2); //Entity Type
+		spawnEntityLiving.getDoubles().write(0, location.getX())
+							  .write(1, location.getY())
+							  .write(2, location.getZ());
+		spawnEntityLiving.getBytes().write(1, (byte) 0) 
+							.write(2, (byte) 0);
+		spawnEntityLiving.getIntegers().write(0, 1); //Data
+		spawnEntityLiving.getShorts().write(0, (short) 0)
+							 .write(1, (short) 0)
+							 .write(2, (short) 0);
+		
+		PacketContainer entityMetadata = protocolManager.createPacket(PacketType.Play.Server.ENTITY_METADATA);
+		entityMetadata.getIntegers().write(0, entityID);
+		entityMetadata.getBytes().write(0, (byte) 0);
+		entityMetadata.getIntegers().write(1, 300);
+		entityMetadata.getStrings().write(0, Strings.nullToEmpty(displayName));
+		entityMetadata.getBooleans().write(0, !Strings.isNullOrEmpty(displayName))
+									.write(1, false)
+									.write(2, true);
+		entityMetadata.getItemModifier().write(0, itemStack);
+        try {
+            protocolManager.sendServerPacket(player, spawnEntityLiving);
+            protocolManager.sendServerPacket(player, entityMetadata);
+            return Result.success();
+        } catch (InvocationTargetException e) {
+        	return Result.failure(e);
+        }
+	}
+}