| gvSIG desktop 1

/* 

*  Copyright (C) 2004 Thorsten Kamann

*

*  File :               PortValidator.java

*  Description :        Validates a given port whether it is available or not

*  Author's email :     thorsten.kamann@planetes.de

*  Author's Website :   http://www.izforge.com

*

*  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 2

*  of the License, or 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, write to the Free Software

*  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

package com.izforge.izpack.util;

import com.izforge.izpack.panels.ProcessingClient;

import com.izforge.izpack.panels.Validator;

import java.net.InetAddress;

import java.net.ServerSocket;

/**

 * A validator to check whether a port is available (free) on the localhost.

 * 

 * This validator can be used for rule input fields in the UserInputPanel to make

 * sure that the port the user entered is not in use.

 * 

 * @author thorque

 */

public class PortValidator implements Validator

{

        public boolean validate(ProcessingClient client){

                InetAddress inet = null;

                String host = "localhost";

                boolean retValue = false;

                int numfields = client.getNumFields();

            for (int i = 0; i < numfields; i++){

                      String value = client.getFieldContents(i);

                      if ((value == null) || (value.length() == 0)){

                        return false;

                        }

                        try{

                    inet = InetAddress.getByName(host);

                                ServerSocket socket = new ServerSocket(Integer.parseInt(value), 0, inet);

                                if (socket.getLocalPort() > 0){

                                        retValue = true;

                                }else{

                                        retValue = false;

                                }

                                if (!retValue){

                                        break;

                                }

                            socket.close();

            }catch (Exception ex){

                    retValue = false;

                }

                }

                return retValue;

    }

}