package de.glossmaker.gui.gloss.help;

 import java.awt.Component;

 import java.awt.MenuItem;

 import java.io.File;

 import java.net.URL;

 import java.util.Locale;

 import javax.help.HelpBroker;

 import javax.help.HelpSet;

 import javax.help.JHelp;

 import javax.swing.JRootPane;

 import org.apache.log4j.Logger;

 /**

  * This class represents the help system for GlossMaker.

  * 

  * @author Markus Flingelli

  *

  */

 public class HelpSystem {

         private static final Logger mLogger = Logger.getLogger(HelpSystem.class);

         private static HelpSystem mHelpSystem = null;

         private static JHelp mHelpViewer = null;

         private static HelpBroker mHelpBroker = null;

         private static JRootPane mRootPane = null;

         private static String mLanguage = null;

         private HelpSet mHelpSet;

         private HelpSystem() {

                 try {

                         File f = new File("");

                         // after jar:file: no '/' because of UNIX/Linux

                         URL url = new URL("jar:file:" + f.getAbsolutePath() + 

                                         "/resources/help/translations/glossmaker_" + 

                                         Locale.getDefault().getLanguage().toUpperCase() + 

                                         ".jar!/jhelpset.hs"); 

                         mHelpSet = new HelpSet(null, url);

                         mHelpBroker = mHelpSet.createHelpBroker();

                         mHelpViewer = new JHelp(mHelpSet);

                 } catch (Exception e) {

                         mLogger.error("Help system not found.", e);

                 }

         }

         private void changeLanguage() {

                 try {

                         File f = new File("");

                         URL url = new URL("jar:file:" + f.getAbsolutePath() + 

                                         "/resources/help/translations/glossmaker_" + 

                                         Locale.getDefault().getLanguage().toUpperCase() + 

                                         ".jar!/jhelpset.hs"); 

                         mHelpSet = new HelpSet(null, url);

                         mHelpBroker.setHelpSet(mHelpSet);

                         mHelpViewer = new JHelp(mHelpSet);

                 } catch (Exception e) {

                         mLogger.error("Help system not found.", e);

                 }

         }

         public void setRootPane(JRootPane rootPane) {

                 mRootPane = rootPane;

         }

         public static HelpSystem getInstance() {

                 if (mHelpSystem == null) {

                         mHelpSystem = new HelpSystem();

                         mLanguage = Locale.getDefault().getLanguage();

                 } 

                 if (Locale.getDefault().getLanguage().equals(mLanguage) == false) {

                         mHelpSystem.changeLanguage();

                         mLanguage = Locale.getDefault().getLanguage();

                 }

                 return mHelpSystem;

         }

         public HelpSet getHelpSet() {

                 return mHelpSet;

         }

         public HelpBroker getHelpBroker() {

                 return mHelpBroker;

         }

         JHelp getHelpViewer() {

                 return mHelpViewer;

         }

         public void enableHelp(String str) {

                 mHelpBroker.enableHelp(mRootPane, str, mHelpSet);

         }

         public void enableHelp(MenuItem item, String str, HelpSet hs) {

                 mHelpBroker.enableHelp(item, str, hs);

         }

         public void enableHelp(Component component, String str, HelpSet hs) {

                 mHelpBroker.enableHelp(component, str, hs);

         }

         public void enableHelpOnButton(Component component, String str, HelpSet hs) {

                 mHelpBroker.enableHelpOnButton(component, str, hs);

         }

         public void enableHelpKey(Component component, String str, HelpSet hs) {

                 mHelpBroker.enableHelpKey(component, str, hs);

         }

 }