/*

 * This program is free software: you can redistribute it and/or modify it under

 * the terms of the GNU General Public License as published by the Free Software

 * Foundation, either version 3 of the License, or (at your option) any later

 * version.

 * 

 * This program is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more

 * details.

 * 

 * You should have received a copy of the GNU General Public License along with

 * this program. If not, see <http://www.gnu.org/licenses/>.

 */



package gameserver.configs;



import java.io.File;

import java.net.InetAddress;

import java.net.UnknownHostException;

import java.util.ArrayList;

import java.util.List;



import javax.xml.parsers.SAXParser;

import javax.xml.parsers.SAXParserFactory;



import org.apache.log4j.Logger;

import org.xml.sax.Attributes;

import org.xml.sax.SAXException;

import org.xml.sax.helpers.DefaultHandler;



import commons.network.IPRange;



/**

 * Class that is designed to read IPConfig.xml

 */



public class IPConfig

{

	/**

	* Logger

	*/

	private static final Logger	log	= Logger.getLogger(IPConfig.class);



	/**

	* Location of config file

	*/

	private static final String	CONFIG_FILE	= "./config/ipconfig.xml";



	/**

	* List of all ip ranges

	*/

	private static final List<IPRange>	ranges	= new ArrayList<IPRange>();



	/**

	* Default address

	*/

	private static byte[]	defaultAddress;



	/**

	* Method that loads IPConfig

	*/

	public static void load()

	{

		try

		{

			SAXParser parser = SAXParserFactory.newInstance().newSAXParser();

			parser.parse(new File(CONFIG_FILE), new DefaultHandler(){



				@Override

				public void startElement(String uri, String localName, String qName, Attributes attributes)

					throws SAXException

				{



					if(qName.equals("ipconfig"))

					{

						try

						{

							defaultAddress = InetAddress.getByName(attributes.getValue("default")).getAddress();

						}

						catch(UnknownHostException e)

						{

							throw new RuntimeException("Failed to resolve DSN for address: "

								+ attributes.getValue("default"), e);

						}

					}

					else if(qName.equals("iprange"))

					{

						String min = attributes.getValue("min");

						String max = attributes.getValue("max");

						String address = attributes.getValue("address");

						IPRange ipRange = new IPRange(min, max, address);

						ranges.add(ipRange);

					}

				}

			});

		}

		catch(Exception e)

		{

			log.fatal("Critical error while parsing ipConfig", e);

			throw new Error("Can't load ipConfig", e);

		}

	}



	/**

	* Returns list of ip ranges

	* 

	* @return list of ip ranges

	*/

	public static List<IPRange> getRanges()

	{

		return ranges;

	}



	/**

	* Returns default address

	* 

	* @return default address

	*/

	public static byte[] getDefaultAddress()

	{

		return defaultAddress;

	}

}