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public class WhoisPlugin implements IClientPlugin {

    public static final String PLUGIN_NAME = "whois";
    private WhoisPluginProvider provider;
    
    @Override
    public Properties getProperties() {
        Properties props = new Properties();
        props.put(DISPLAY_NAME, getName());
        return props;
    }

    @Override
    public void load() throws PluginException {
        // ignore
    }

    @Override
    public void unload() throws PluginException {
        provider = null;
    }

    @Override
    public void propertyChange(PropertyChangeEvent arg0) {
        // ignore
    }

    @Override
    public IScriptable getScriptObject() {
        if (provider == null) {
            provider = new WhoisPluginProvider();
        } 
        return provider;
    }

    @Override
    public Icon getImage() {
        URL iconUrl = getClass().getResource("images/whois.png"); //the image is added under a package 'net.stuffcom.servoy.plugins.whois.images' added to the WhoisPlugin project.
        if (iconUrl != null) {
            return new ImageIcon(iconUrl);
        } else {
            return null;
        }
    }

    @Override
    public String getName() {
        return PLUGIN_NAME;
    }

    @Override
    public void initialize(IClientPluginAccess arg0) throws PluginException {
        // ignore
    }
}

@ServoyDocumented(publicName = WhoisPlugin.PLUGIN_NAME, scriptingName = "plugins." + WhoisPlugin.PLUGIN_NAME)
public class WhoisPluginProvider implements IScriptable, IReturnedTypesProvider {

    @Override
    public Class<?>[] getAllReturnedTypes() {
        return null;
    }
    
    private String server = "whois.networksolutions.com";
    private int port = 43;
    private int timeout = 30 * 1000; // unit is milliseconds
    
    @JSGetter
    public String getServer() {
        return server;
    }

    @JSSetter
    public void setServer(String server) {
        this.server = server;
    }

    @JSGetter
    public int getPort() {
        return port;
    }

    @JSSetter
    public void setPort(int port) {
        this.port = port;
    }

    @JSGetter
    public int getTimeout() {
        return timeout;
    }

    @JSSetter
    public void setTimeout(int timeout) {
        this.timeout = timeout;
    }

    /**
     * @clonedesc query(String, String, int, int)
     * @sampleas query(String, String, int, int)
     * @param domainName
     */
    @JSFunction
    public String query(String domainName) {
        return query(domainName, this.server, this.port, this.timeout);
    }
    
    /**
     * @clonedesc query(String, String, int, int)
     * @sampleas query(String, String, int, int)
     * @param domainName
     * @param server
     */
    @JSFunction
    public String query(String domainName, String server) {
        return query(domainName, server, this.port, this.timeout);
    }
    
    /**
     * @clonedesc query(String, String, int, int)
     * @sampleas query(String, String, int, int)
     * @param domaninName
     * @param server
     * @param port
     */
    @JSFunction
    public String query(String domainName, String server, int port) {
        return query(domainName, server, port, this.timeout);
    }
    
    /**
     * Calls a whois server to retrieve information about the domain name you provide
     * 
     * @sample
     * // you call a whois server by providing a domain name and get info in return
     * var result = plugins.whois.query('servoy.com');
     * // alternatively you can provide an alternate server (default is networksolutionnetworksolutions.com)
     * var result = plugins.whois.query('servoy.com', 'whois.internic.net/whois.html');
     * // you can also provide a port, if not standard (43 by deafault)
     * var result = plugins.whois.query('servoy.com', 'whois.internic.net', 43);
     * // and you can also provide a timeout length (unit is milliseconds, default is 30 seconds)
     * var result = plugins.whois.query('servoy.com', 'whois.internic.net', 43, 50000);
     * 
     * @param domainName
     * @param server
     * @param port
     * @param timeout
     * @return
     */
    @JSFunction
    public String query(String domainName, String server, int port, int timeout) {
        try {
            // create the socket
            Socket socket = new Socket(server, port);
            socket.setSoTimeout(timeout);
            // create a reader to get the response from the server
            BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
            // create an output stream to send our query to the server
            DataOutputStream out = new DataOutputStream(socket.getOutputStream());
            // call the service with the domainName supplied
            // and terminate with carriage return)
            out.writeBytes(domainName + " \r\n");
            // read the response from the server
            String str1 = null;
            StringBuffer buffer = new StringBuffer();
            while ((str1 = in.readLine()) != null) {
                buffer.append(str1);
                buffer.append("\r\n");
            }
            // close our stream and reader
            out.close();
            in.close();
            // close the socket
            socket.close();
            // return the result as String
            return buffer.toString();
        } catch (IOException ioEx) {
            return ioEx.getLocalizedMessage();
        } catch (Exception ex) {
            return ex.getLocalizedMessage();
        }
    }
}

net.stuffcom.servoy.plugins.whois.WhoisPlugin