Main.java

/*
 *  UFO Saved Game Editor
 *  Copyright (C) 2010 Christopher Davoren
 *
 *  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 3 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, see <http://www.gnu.org/licenses/>.
 */

package net.rubikscomplex.ufosge;

import java.io.IOException;
import java.util.ArrayList;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import net.rubikscomplex.ufosge.data.SaveInfo;
import net.rubikscomplex.ufosge.data.SavedGame;
import net.rubikscomplex.ufosge.gui.PreferencesDialog;
import net.rubikscomplex.ufosge.gui.SaveSelectFrame;
import net.rubikscomplex.ufosge.resources.BaseBit;
import net.rubikscomplex.ufosge.resources.BigLetter;
import net.rubikscomplex.ufosge.resources.ResourceManager;


/**
 * Main class - contains the main() method which is executed at application
 * startup and constants relating to command line arguments.
 *
 * @author Chris Davoren
 */
public class Main {

    /**
     * String of the command line argument that deletes all preferences for the application.
     */
    public static final String ARG_DELETE_PREFS = "cleanprefs";

    /**
     * Initialises and displays the GUI.
     * 
     * The look and feel is set, resources are loaded before starting the
     * attempting to load the list of saved games.  This list is displayed in
     * a new SaveSelectFrame as the first interactive window presented to the
     * user.
     */
    private static void createAndShowGUI() {
        ArrayList<SaveInfo> sgSummaries = null;

        try {
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }
        catch (Exception e) {
            JOptionPane.showMessageDialog(null, "Unable to set the UI look and feel.  Appearance may be unusual.", "Warning", JOptionPane.WARNING_MESSAGE);
        }

        try {
            BaseBit.loadBaseBits();
            BigLetter.loadBigLetters();
        }
        catch (IOException e) {
            JOptionPane.showMessageDialog(null, "An I/O error occured while loading a required resource:\n\n" + e.getMessage() + "\n\nPlease check that the program installed correctly.", "Load Error", JOptionPane.ERROR_MESSAGE);
            System.exit(-1);
        }

        if (ResourceManager.getUserPreferences().get(ResourceManager.PREF_UFO_DIR, null) == null) {
            PreferencesDialog prefsDialog = new PreferencesDialog(null);
            prefsDialog.setVisible(true);

            if (prefsDialog.getResult() == PreferencesDialog.RESULT_CANCEL) {
                System.exit(-1);
            }
        }

        int preferencesDialogResult = PreferencesDialog.RESULT_OK;
        while (sgSummaries == null && preferencesDialogResult == PreferencesDialog.RESULT_OK) {
            try {
                sgSummaries = SavedGame.loadSummaries(ResourceManager.getUserPreferences().get(ResourceManager.PREF_UFO_DIR, null));
            }
            catch (IOException e) {
                JOptionPane.showMessageDialog(null, "Unable to load saved game listing.  Please confirm your UFO directory.", "Load Error", JOptionPane.ERROR_MESSAGE);
                PreferencesDialog prefsDialog = new PreferencesDialog(null);
                prefsDialog.setVisible(true);
                preferencesDialogResult = prefsDialog.getResult();
            }
        }

        try {
            SaveSelectFrame saveSelectFrame = new SaveSelectFrame(sgSummaries);
            saveSelectFrame.setVisible(true);
        }
        catch (Exception e) {
            JOptionPane.showMessageDialog(null, "A fatal error has occurred:\n\n" + e.getMessage(), "Error", JOptionPane.ERROR_MESSAGE);
            System.exit(-1);
        }
    }

    /**
     * Main startup method that loads resources and starts the graphical user
     * interface.
     *
     * Command line arguments are parsed before the GUI is started.  The effect
     * of some command line arguments may cause the program to terminate without
     * starting the GUI.  ARG_DELETE_PREFS is one example of this - if this
     * command line argument is found, application preferences will be entirely
     * deleted and then the program will quit.
     *
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        for(int i = 0; i < args.length; i++) {
            if (args[i].equals("-" + ARG_DELETE_PREFS)) {
                ResourceManager.deleteUserPreferences();
                return;
            }
        }

        SwingUtilities.invokeLater(new Runnable() {
           public void run() {
               createAndShowGUI();
           }
        });
    }
}