Worldguard Custom flags

Hello,

I have little knowledge about the worldguard api, but I want to make something to cancel interaction with specific items if the flag is "deny".

How would I do this?

This is my current code:

Code:java

package com.mcavengers.WGJordiFlag;
 
import org.bukkit.event.EventHandler;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;
 
import com.mewin.WGCustomFlags.WGCustomFlagsPlugin;
import com.sk89q.worldguard.bukkit.WorldGuardPlugin;
import com.sk89q.worldguard.protection.flags.StateFlag;
 
public class main extends JavaPlugin {
 
    public static StateFlag JordiFlag = new StateFlag("JordiFlag", true);
 
    @Override
    public void onEnable() {
        getWGCustomFlags().addCustomFlag(JordiFlag);
    }
 
    @Override
    public void onDisable() {
 
    }
 
    @EventHandler
    public void onBuild(PlayerInteractEvent e){
        //?
    }
 
    private WorldGuardPlugin getWorldGuard() {
        Plugin plugin = getServer().getPluginManager().getPlugin("WorldGuard");
 
        if (plugin == null || !(plugin instanceof WorldGuardPlugin)) {
            return null;
        }
 
        return (WorldGuardPlugin) plugin;
    }
 
    private WGCustomFlagsPlugin getWGCustomFlags() {
        Plugin plugin = getServer().getPluginManager().getPlugin("WGCustomFlags");
 
        if (plugin == null || !(plugin instanceof WGCustomFlagsPlugin)) {
            return null;
        }
 
        return (WGCustomFlagsPlugin) plugin;
    }
 
}