source: gli/trunk/src/org/greenstone/gatherer/GathererApplet.java@ 17004

/**
 *#########################################################################
 *
 * A component of the Gatherer application, part of the Greenstone digital
 * library suite from the New Zealand Digital Library Project at the
 * University of Waikato, New Zealand.
 *
 * Author: John Thompson, Greenstone Digital Library, University of Waikato
 *
 * Copyright (C) 1999 New Zealand Digital Library Project
 *
 * 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
 * (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, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *########################################################################
 */

package org.greenstone.gatherer;

import java.applet.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.*;
import javax.swing.JApplet;

import java.io.*;
import javax.swing.*;
import org.greenstone.gatherer.util.JarTools;
import org.greenstone.gatherer.util.UnzipTools;
import org.greenstone.gatherer.util.Utility;


public class GathererApplet extends JApplet implements ActionListener
{
    private Gatherer gatherer = null;


    protected String fullLibraryURL(String address) 
    {
    String full_address = "";

        // make sure the URL has protocol, host, and file
        if (address.startsWith("http:")) {
            // the address has all the necessary components
        full_address = address;
        } 
    else if (address.startsWith("/")) {
            // there is not protocol and host
            URL document = getDocumentBase();
        int port_no = document.getPort();

            String port = (port_no>0) ? ":" + port_no : "";
            full_address = "http://" + document.getHost() + port  + address;
    }

    return full_address;
    }


    /* This is the entry point for the GLI applet */
    public void init()
    {
    JarTools.initialise(this); 

    // Check if the user has agreed to the requested security settings
    try {
        // Work-around to reduce number of 
        // 'Could not lock user prefs' error messages.
        // Thanks to Walter Schatz from the java forums.
        System.setProperty("java.util.prefs.syncInterval","2000000");
    }
    catch (Exception exception) {
        getContentPane().add(new JLabel("Greenstone Librarian Interface Applet deactivated", JLabel.CENTER));
        return;
    }

    // Ensure platform specific LAF
    try {
        UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch (Exception exception) {
        exception.printStackTrace();
    }

    // Determine the GLI user directory path
    String gli_user_directory_path = System.getProperty("user.home") + File.separator;
        if (Utility.isWindows()) {
        String windows_home_parameter = getParameter("windowsHome");
        if (windows_home_parameter != null && !windows_home_parameter.equals("")) {
        gli_user_directory_path = windows_home_parameter + File.separator + "GLI" + File.separator;
        }
        else {
        gli_user_directory_path += "Application Data" + File.separator + "Greenstone" + File.separator + "GLI" + File.separator;
        }
    }
        else {
            gli_user_directory_path += ".gli" + File.separator;
        }
    Gatherer.setGLIUserDirectoryPath(gli_user_directory_path);

    // If we're running as an applet we don't have a local GLI, so use the user directory path as the GLI path
    Gatherer.setGLIDirectoryPath(gli_user_directory_path);

    // Set some global variables so we know how we're running
    Gatherer.isApplet = true;
    String library_url_string = fullLibraryURL(getParameter("gwcgi"));

    String gs3 = getParameter("gsdl3");
    boolean isGS3 = (gs3 == null || !gs3.equals("true")) ? false : true;

    String gliserver_url_string;
    if(!isGS3) {
        gliserver_url_string = library_url_string.substring(0, library_url_string.lastIndexOf('/') + 1) + "gliserver.pl";
    } else {
        gliserver_url_string = library_url_string + "/cgi-bin/gliserver.pl";
    }

        // String debug_param = getParameter("debug");
        // if ((debug_param != null) && (debug_param.matches("true"))) {
        //     go.debug = true;
        // }

    String[] args;
    if(!isGS3) {
        String[] gs2_args = { 
        "-use_remote_greenstone",
        "-gliserver_url", gliserver_url_string,
        "-library_url", library_url_string,
        // "-debug",
        };
        args = gs2_args;
    } else { // >= GS3
        String[] gs3_args = {
        "-use_remote_greenstone",
        "-gliserver_url", gliserver_url_string,
        "-library_url", library_url_string,
        "-gsdl3",
        //"-debug",
        };
        args = gs3_args;
    }
    
    File collect_directory = new File(Gatherer.getCollectDirectoryPath());
    if (!collect_directory.exists()) {
        if (JarTools.isInJar("collect.zip")) {
        // Dig out collect.zip from JAR file and unzip it (thereby
        // creating collect directory and descendants.
        //   This is done to seed gsdl home folder with config files
        //   for documented example collections so "base this on
        //   existing collection" works
        unzipFromJar("collect.zip", Gatherer.getGLIUserDirectoryPath());
        }
        else {
        // Prepare an empty collect dir for use
        if (!collect_directory.mkdir()) {
            System.err.println("Warning: Unable to make directory: " + collect_directory);
        }
        }
    }

    File metadata_directory = new File(Gatherer.getGLIMetadataDirectoryPath());
    if (!metadata_directory.exists()) {
        // dig out metadata.zip from JAR file and unzip it
        unzipFromJar("metadata.zip", Gatherer.getGLIDirectoryPath());
    }

    // Create an instance of the Gatherer class, which will parse the args and prepare the rest of the GLI
    gatherer = new Gatherer(args);

    // Create a button for the user to press to open the GLI GUI
    JButton launch_GLI_button = new JButton("Launch Greenstone Librarian Interface ...");
    launch_GLI_button.addActionListener(this);
    getContentPane().add(launch_GLI_button);
    }


    public void start() 
    {
    System.err.println("Start called");
    }


    public void stop()
    {
    System.err.println("Stop called");
    }


    public void destroy()
    {
    System.err.println("Destroy called");
    gatherer.exit();
    // Don't do the following: on reloading the applet in the browser 
    // the browser (tested on Firefox) crashes if gatherer set to null here.
    //gatherer = null; 
    System.err.println("Done gatherer exit.");
    }


    public void actionPerformed(ActionEvent e)
    {
    gatherer.openGUI();
    }


    /** 
     * Method which unzips a given metadata resoure.
     * @param jar_zip_fname The name of the jar file as a <strong>String</strong>.
     * @param dst_dir The destination directory for unzipping, also as a <strong>String</strong>.
     * @see JarTools.extractFromJar(String, String, boolean)
     */
    static public void unzipFromJar(String jar_zip_fname, String dst_dir)
    {
    if (!dst_dir.endsWith(File.separator)) {
        dst_dir += File.separator;
    }

    JarTools.extractFromJar(jar_zip_fname, dst_dir, true);
    UnzipTools.unzipFile(dst_dir + jar_zip_fname, dst_dir);
    }
}