001/*
002 * IzPack - Copyright 2001-2005 Julien Ponge, All Rights Reserved.
003 * 
004 * http://www.izforge.com/izpack/
005 * http://developer.berlios.de/projects/izpack/
006 * 
007 * Copyright 2004 Thorsten Kamann
008 * 
009 * Licensed under the Apache License, Version 2.0 (the "License");
010 * you may not use this file except in compliance with the License.
011 * You may obtain a copy of the License at
012 * 
013 *     http://www.apache.org/licenses/LICENSE-2.0
014 *     
015 * Unless required by applicable law or agreed to in writing, software
016 * distributed under the License is distributed on an "AS IS" BASIS,
017 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
018 * See the License for the specific language governing permissions and
019 * limitations under the License.
020 */
021
022package com.izforge.izpack.util;
023
024import java.net.InetAddress;
025import java.net.ServerSocket;
026
027import com.izforge.izpack.panels.ProcessingClient;
028import com.izforge.izpack.panels.Validator;
029
030/**
031 * A validator to check wheter a host:port is available (free).
032 * 
033 * This validator can be used for rule input fields in the UserInputPanel to make sure that the port
034 * the user entered is not in use.
035 * 
036 * @author thorque
037 */
038public class HostAddressValidator implements Validator
039{
040
041    public boolean validate(ProcessingClient client)
042    {
043        InetAddress inet = null;
044        String host = "";
045        int port = 0;
046        boolean retValue = false;
047
048        try
049        {
050            host = client.getFieldContents(0);
051            port = Integer.parseInt(client.getFieldContents(1));
052        }
053        catch (Exception e)
054        {
055            return false;
056        }
057
058        try
059        {
060            inet = InetAddress.getByName(host);
061            ServerSocket socket = new ServerSocket(port, 0, inet);
062            if (socket.getLocalPort() > 0)
063            {
064                retValue = true;
065            }
066            else
067            {
068                retValue = false;
069            }
070            socket.close();
071        }
072        catch (Exception ex)
073        {
074            retValue = false;
075        }
076        return retValue;
077    }
078
079}