src/net/pterodactylus/jsite/i18n/I18n.java

   1 /*
   2  * jSite2 - I18n.java -
   3  * Copyright © 2008 David Roden
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18  */
  19
  20 package net.pterodactylus.jsite.i18n;
  21
  22 import java.awt.event.InputEvent;
  23 import java.awt.event.KeyEvent;
  24 import java.io.IOException;
  25 import java.io.InputStream;
  26 import java.lang.reflect.Field;
  27 import java.util.Locale;
  28 import java.util.MissingResourceException;
  29 import java.util.Properties;
  30 import java.util.StringTokenizer;
  31
  32 import javax.swing.KeyStroke;
  33
  34 import net.pterodactylus.util.io.Closer;
  35
  36 /**
  37  * Class that handles i18n.
  38  *
  39  * @author David ‘Bombe’ Roden &lt;bombe@freenetproject.org&gt;
  40  * @version $Id$
  41  */
  42 public class I18n {
  43
  44         /** The current locale. */
  45         private static Locale currentLocale;
  46
  47         /** The default language. */
  48         private static Properties defaultLanguage;
  49
  50         /** The current language. */
  51         private static Properties currentLanguage;
  52
  53         static {
  54                 defaultLanguage = new Properties();
  55                 InputStream inputStream = null;
  56                 try {
  57                         inputStream = I18n.class.getResourceAsStream("jSite.properties");
  58                         if (inputStream != null) {
  59                                 defaultLanguage.load(inputStream);
  60                         }
  61                 } catch (IOException e) {
  62                         /* something is fucked. */
  63                 }
  64                 setLocale(Locale.getDefault());
  65         }
  66
  67         /**
  68          * Returns the translated value for a key.
  69          *
  70          * @param key
  71          *            The key to get
  72          * @return The translated message, or the key itself if no translation could
  73          *         be found
  74          */
  75         public static String get(String key) {
  76                 String value = null;
  77                 value = currentLanguage.getProperty(key);
  78                 if (value == null) {
  79                         return key;
  80                 }
  81                 return value;
  82         }
  83
  84         /**
  85          * Returns the keycode from the value of the given key. You can specify the
  86          * constants in {@link KeyEvent} in the properties file, e.g. VK_S for the
  87          * keycode ‘s’ when used for mnemonics.
  88          *
  89          * @param key
  90          *            The key under which the keycode is stored
  91          * @return The keycode
  92          */
  93         public static int getKey(String key) {
  94                 String value = get(key);
  95                 if (value.startsWith("VK_")) {
  96                         try {
  97                                 Field field = KeyEvent.class.getField(value);
  98                                 return field.getInt(null);
  99                         } catch (SecurityException e) {
 100                                 /* ignore. */
 101                         } catch (NoSuchFieldException e) {
 102                                 /* ignore. */
 103                         } catch (IllegalArgumentException e) {
 104                                 /* ignore. */
 105                         } catch (IllegalAccessException e) {
 106                                 /* ignore. */
 107                         }
 108                 }
 109                 return value.toUpperCase().charAt(0);
 110         }
 111
 112         /**
 113          * Returns a key stroke for use with swing accelerators.
 114          *
 115          * @param key
 116          *            The key of the key stroke
 117          * @return The key stroke, or <code>null</code> if no key stroke could be
 118          *         created from the translated value
 119          */
 120         public static KeyStroke getKeyStroke(String key) {
 121                 String value = get(key);
 122                 if (value == null) {
 123                         return null;
 124                 }
 125                 StringTokenizer keyTokens = new StringTokenizer(value, "+- ");
 126                 int modifierMask = 0;
 127                 while (keyTokens.hasMoreTokens()) {
 128                         String keyToken = keyTokens.nextToken();
 129                         if ("ctrl".equalsIgnoreCase(keyToken)) {
 130                                 modifierMask |= InputEvent.CTRL_DOWN_MASK;
 131                         } else if ("alt".equalsIgnoreCase(keyToken)) {
 132                                 modifierMask |= InputEvent.ALT_DOWN_MASK;
 133                         } else if ("shift".equalsIgnoreCase(keyToken)) {
 134                                 modifierMask |= InputEvent.SHIFT_DOWN_MASK;
 135                         } else {
 136                                 if (keyToken.startsWith("VK_")) {
 137                                         try {
 138                                                 Field field = KeyEvent.class.getField(keyToken);
 139                                                 return KeyStroke.getKeyStroke(field.getInt(null), modifierMask);
 140                                         } catch (SecurityException e) {
 141                                                 /* ignore. */
 142                                         } catch (NoSuchFieldException e) {
 143                                                 /* ignore. */
 144                                         } catch (IllegalArgumentException e) {
 145                                                 /* ignore. */
 146                                         } catch (IllegalAccessException e) {
 147                                                 /* ignore. */
 148                                         }
 149                                 }
 150                                 return KeyStroke.getKeyStroke(keyToken.charAt(0), modifierMask);
 151                         }
 152                 }
 153                 return null;
 154         }
 155
 156         /**
 157          * Sets the current locale.
 158          *
 159          * @param newLocale
 160          *            The new locale to use
 161          */
 162         public static void setLocale(Locale newLocale) {
 163                 currentLocale = newLocale;
 164                 InputStream inputStream = null;
 165                 try {
 166                         currentLanguage = new Properties(defaultLanguage);
 167                         inputStream = I18n.class.getResourceAsStream("jSite_" + currentLocale.toString() + ".properties");
 168                         if (inputStream != null) {
 169                                 currentLanguage.load(inputStream);
 170                         }
 171                 } catch (MissingResourceException mre1) {
 172                         currentLocale = Locale.ENGLISH;
 173                 } catch (IOException ioe1) {
 174                         currentLocale = Locale.ENGLISH;
 175                 } finally {
 176                         Closer.close(inputStream);
 177                 }
 178         }
 179 }