com.ircclouds.irc.api.utils.NetUtils Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of irc-api Show documentation

There is a newer version: 1.0-0014

package com.ircclouds.irc.api.utils;

import java.io.*;
import java.net.*;
import java.util.*;

public class NetUtils
{	
	public static int getRandDccPort()
	{
		return getRandPortIn(1024, 5000);
	}
	
	public static int getRandPortIn(int aMin, int aMax)
	{
		if (aMin >= aMax)
		{
			throw new RuntimeException("Please provide a valid [Min-Max] range.");
		}
		
		Random _rand = new Random();
		int _port = _rand.nextInt(aMax - aMin) + aMin;
		while (!NetUtils.available(_port))
		{
			_port = _rand.nextInt(aMax - aMin) + aMin;
		}
		
		return _port;
	}
	
	public static boolean available(int aPort)
	{
		ServerSocket _ss = null;
		try
		{
			_ss = new ServerSocket(aPort);
			_ss.setReuseAddress(true);
			
			return true;
		}
		catch (IOException aExc)
		{
		}
		finally
		{
			if (_ss != null)
			{
				try
				{
					_ss.close();
				}
				catch (IOException aExc)
				{
				}
			}
		}

		return false;
	}
}