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 Kamman
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.Processor;
029
030/**
031 * Checks whether the value of the field comtemt is a port and is free. If false the next free port
032 * will be searched.
033 * 
034 * @author Thorsten Kamann <thorsten.kamann@planetes.de>
035 */
036public class PortProcessor implements Processor
037{
038
039    public String process(ProcessingClient client)
040    {
041        String retValue = "";
042        String host = "localhost";
043        int port = 0;
044        int oPort = 0;
045        boolean found = false;
046        InetAddress inet = null;
047        ServerSocket socket = null;
048
049        try
050        {
051            if (client.getNumFields() > 1)
052            {
053                host = client.getFieldContents(0);
054                oPort = Integer.parseInt(client.getFieldContents(1));
055            }
056            else
057            {
058                oPort = Integer.parseInt(client.getFieldContents(0));
059            }
060        }
061        catch (Exception ex)
062        {
063            return getReturnValue(client, null, null);
064        }
065
066        port = oPort;
067        while (!found)
068        {
069            try
070            {
071                inet = InetAddress.getByName(host);
072                socket = new ServerSocket(port, 0, inet);
073                if (socket.getLocalPort() > 0)
074                {
075                    found = true;
076                    retValue = getReturnValue(client, null, String.valueOf(port));
077                }
078                else
079                {
080                    port++;
081                }
082            }
083            catch (java.net.BindException ex)
084            {
085                port++;
086            }
087            catch (Exception ex)
088            {
089                return getReturnValue(client, null, null);
090            }
091            finally
092            {
093                try
094                {
095                    socket.close();
096                }
097                catch (Exception ex)
098                {}
099            }
100        }
101        return retValue;
102    }
103
104    /**
105     * Creates the return value
106     * 
107     * @param client The ProcessingClient
108     */
109    private String getReturnValue(ProcessingClient client, String host, String port)
110    {
111        String retValue = "";
112        String _host = "";
113        String _port = "";
114
115        if (client.getNumFields() > 1)
116        {
117            _host = (host == null) ? client.getFieldContents(0) : host;
118            _port = (port == null) ? client.getFieldContents(1) : port;
119            retValue = _host + "*" + _port;
120        }
121        else
122        {
123            _port = (port == null) ? client.getFieldContents(0) : port;
124            retValue = _port;
125        }
126
127        return retValue;
128    }
129}