How do I add OP-only to my plugin?

Hello, I'm currently developing a plugin that makes so that snowballs explode.
And I'm wondering if anyone can help me get the plugin to OP only, or perhaps a config.txt where you put all the admin names in.

I use a ProjectileListener for this.

 

You could test if the thrower is an op? All CommandSenders (Player is also a CommandSender) have a "isOp()" function. If you have the snowball, you can get with the "getShooter()" method the shooter. Then you only have to test, if the shooter is a player. And if it is a player you can test if the player is an op:

Code:

Snowball ball;
if (ball.getShooter() instanceof Player) {
    boolean isOp = ((Player) ball.getShooter()).isOp();
}

Fabian

 

Then you can use the explosion API to create a explosion.

TNT has a power of 12, creepers have 3, so you can pick which distance you want. I recommend the power of 3 which is approximately 1/4 of a power of TNT.

 

As said.. I'm pretty new to Java, a RL friend helped me with some stuff so if you could show me where in my code to put this code I would appreciate it.

Code:

package haias;

import org.bukkit.event.entity.ProjectileHitEvent;
import org.bukkit.event.entity.EntityListener;

public class MyProjectileListener extends EntityListener {
 
    public void onProjectileHit(ProjectileHitEvent event)
    {
        System.out.println(event.getEntity().getClass().getName());

        if (event.getEntity().getClass().getName()=="org.bukkit.craftbukkit.entity.CraftSnowball"){
            event.getEntity().getWorld().createExplosion(event.getEntity().getLocation(), 4);
        }
    }

    public MyProjectileListener(Main p){}
}

 

If you can just place it somewhere towards the bottom before the last curly bracket and test it, it might work.

 

Lol.. Funny that the code he sent me didn't even work.

Doesn't work..

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

You could just remove the public MyProjectileListener(Main p){} if you are not going to use it.
I'll look up the documents and try to find how to create explosions, because I don't want you wasting your time looking for one simple code.

EDIT: Can't find it, sorry!

 

It's alright, I think I figured it out..

 

Have you make sure the action is done, then it checks to see if it's ops or using permission node, and do the explosion event?

 

I'm working on creating a custom Admin list for the plugin, aswell as putting together a blast radius configure.

 

This will require extending your code, adding a new .java file that adds an admin file or config file (you can pick which one, not my decision, but admin file is the best way to go.) I heard there's a tutorial in "Resources" for that.

It could load the config and plugin, load adminlist.txt or config.yml and then look up admins and grant them it.

 

Yup, going to work on this tonight, just chillin' and browsing the forums atm.

 

Speaking of forums, I should go back to work. See you around.

 

Back to work? What do you mean?

 

Working on my plugins.

 

Oh, add me up on Skype / Steam / MSN / whatever.

Skype: lydarii
Steam: TheFaded
MSN: [email protected]

 

I don't have any contact information, only e-mail and Meebo (IM) but I can create a channel on a IRC if you want to chat with me.

 

Sure, do that.

 

Code:

    public void onProjectileHit(ProjectileHitEvent event) {
    	Snowball ball = (Snowball) event.getEntity();
    	if (event.getEntity() instanceof Snowball) {
    		Player player = (Player) ball.getShooter();
    		if (player.isOp()) {
    				event.getEntity().getWorld().createExplosion(event.getEntity().getLocation(), 4);
        	}
    	}
    }

 

Thanks man, lots of bro love to you.

 

I doubt that this is working!

Code:

public void onProjectileHit(ProjectileHitEvent event) {
  if (event.getEntity() instanceof Snowball) {
    Snowball ball = (Snowball) event.getEntity();
    if (event.getShooter() instanceof Player) {
      Player player = (Player) ball.getShooter();
      if (player.isOp()) {
        event.getEntity().getWorld().createExplosion(event.getEntity().getLocation(), 4);
      }
    }
  }
}

Fabian

 

It is working just fine

Lol.. You were right, it's not working.. When I tried it my server must have lagged or what so ever..

Please someone post something that works!

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Actually the code I posted should work. The post from krinsdeath should create errors, if you shoot something else a snowball or somebody (but not players) shoot anything.

This should work?! Why doesn't it work?

Fabian

 

Could you please add your code into my code? I'm not 100% sure where to add it.

 

Replace your method?

Code:

package haias;

import org.bukkit.entity.Player;
import org.bukkit.entity.Snowball;
import org.bukkit.event.entity.ProjectileHitEvent;
import org.bukkit.event.entity.EntityListener;

public class MyProjectileListener extends EntityListener {
    public void onProjectileHit(ProjectileHitEvent event) {
        if (event.getEntity() instanceof Snowball) {
            Snowball ball = (Snowball) event.getEntity();
            if (event.getShooter() instanceof Player) {
                Player player = (Player) ball.getShooter();
                if (player.isOp()) {
                    event.getEntity().getWorld().createExplosion(event.getEntity().getLocation(), 4);
                }
            }
        }
    }

    public MyProjectileListener(Main p){}
}

 

Code:

public void onProjectileHit(ProjectileHitEvent event) {
  Snowball ball = (event.getEntity() instanceof Snowball) ? (Snowball) event.getEntity() : null;
  Player player = (event.getShooter() instanceof Player) ? (Player) event.getShooter() : null;
  if (player == null || ball == null) { return; }
  if (player.isOp()) {
    event.getEntity().getWorld().createExplosion(event.getEntity().getLocation(), 4);
  }
}

This is massively condensed, but xZise was right, my first "solution" would have thrown errors had the shooter been anything other than a player.

 

Ehr sorry, but this code is working (maybe, didn't tested it) but far complexer than the previous versions.

Fabian

 

This code is neither working.. Hmm
When I toss the snowballs the console just spams me errors..

Code:

13:56:44 [SEVERE] Could not pass event PROJECTILE_HIT to Explosive Snowballs java.lang.ClassCastException: org.bukkit.event.entity.ProjectileHitEvent cannot be cast to org.bukkit.entity.Projectile         at haias.MyProjectileListener.onProjectileHit(MyProjectileListener.java: 14)         at org.bukkit.plugin.java.JavaPluginLoader$69.execute(JavaPluginLoader.j ava:726)         at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav a:58)         at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j ava:321)         at net.minecraft.server.Entity.die(Entity.java:147)         at net.minecraft.server.EntitySnowball.m_(EntitySnowball.java:181)         at net.minecraft.server.World.entityJoinedWorld(World.java:1190)         at net.minecraft.server.WorldServer.entityJoinedWorld(WorldServer.java:4 8)         at net.minecraft.server.World.playerJoinedWorld(World.java:1172)         at net.minecraft.server.World.cleanUp(World.java:1102)         at net.minecraft.server.MinecraftServer.h(MinecraftServer.java:447)         at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:361)         at net.minecraft.server.ThreadServerApplication.run(SourceFile:422) >

 

Look in the exception:

Code:

13:56:44 [SEVERE] Could not pass event PROJECTILE_HIT to Explosive Snowballs java.lang.ClassCastException: org.bukkit.event.entity.ProjectileHitEvent cannot be cast to org.bukkit.entity.Projectile
at haias.MyProjectileListener.onProjectileHit(MyProjectileListener.java: 14)
at org.bukkit.plugin.java.JavaPluginLoader$69.execute(JavaPluginLoader.j ava:726)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav a:58)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j ava:321)
at net.minecraft.server.Entity.die(Entity.java:147)
at net.minecraft.server.EntitySnowball.m_(EntitySnowball.java:181)
[...]

First line is a description about the problem: A class cast exception occur, if you try to cast something to something other, but it isn't possible (in your case ProjectileHitEvent to Projectile). A cast is this with the brackets:

Code:

Object x = new String("Hello world");
String s = (String) x

If now the variable x couldn't be converted to a String the error occur.

The rest is a Stack trace: So the method "onProjectileHit()" was called by "execute" which was called by "callEvent" and so on.

So the location where the error occurs is in the first line on the stack trace:

Code:

at haias.MyProjectileListener.onProjectileHit(MyProjectileListener.java: 14)

This means: In the Package "haias" in the file "MyProjectileListener.java" in the method "onProjectileHit". And in specific in the file "MyProjectileListener.java" in line 14. I don't know what there is, but no code here does a cast to Projectile.

Fabian