inc/classes/main/language/class_LanguageSystem.php

   1 <?php
   2 /**
   3  * The language sub-system for handling language strings being used in the
   4  * application and whole framework
   5  *
   6  * @author              Roland Haeder <webmaster@ship-simu.org>
   7  * @version             0.0.0
   8  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 Core Developer Team
   9  * @license             GNU GPL 3.0 or any newer version
  10  * @link                http://www.ship-simu.org
  11  *
  12  * This program is free software: you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation, either version 3 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  24  */
  25 class LanguageSystem extends BaseFrameworkSystem implements ManageableLanguage, Registerable {
  26         /**
  27          * The full-qualified base path for the language include files
  28          */
  29         private $languageBasePath = '';
  30
  31         /**
  32          * The 2-char language code
  33          */
  34         private $langCode = 'xx'; // This will later be overwritten!
  35
  36         /**
  37          * The array-object for all language strings
  38          */
  39         private $langStrings = null;
  40
  41         /**
  42          * An instance of this class
  43          */
  44         private static $thisInstance = null;
  45
  46         /**
  47          * Protected constructor
  48          *
  49          * @return      void
  50          */
  51         protected function __construct () {
  52                 // Call parent constructor
  53                 parent::__construct(__CLASS__);
  54         }
  55
  56         /**
  57          * Creates an instance of the class LanguageSystem and prepares it for usage
  58          *
  59          * @param       $languageBasePath       The local base path for all language strings
  60          * @return      $langInstance   An instance of LanguageSystem
  61          * @throws      LanguagePathIsEmptyException    If the provided $languageBasePath is empty
  62          * @throws      InvalidLanguagePathStringException      If $languageBasePath is no string
  63          * @throws      LanguagePathIsNoDirectoryException      If $languageBasePath is no
  64          *                                                                              directory or not found
  65          * @throws      LanguagePathReadProtectedException      If $languageBasePath is
  66          *                                                                              read-protected
  67          */
  68         public final static function createLanguageSystem ($languageBasePath) {
  69                 // Get a new instance
  70                 $langInstance = new LanguageSystem();
  71
  72                 // Is the base path valid?
  73                 if (empty($languageBasePath)) {
  74                         // Language path is empty
  75                         throw new LanguagePathIsEmptyException($langInstance, self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
  76                 } elseif (!is_string($languageBasePath)) {
  77                         // Is not a string
  78                         throw new InvalidLanguagePathStringException(array($langInstance, $languageBasePath), self::EXCEPTION_INVALID_STRING);
  79                 } elseif (!is_dir($languageBasePath)) {
  80                         // Is not a path
  81                         throw new LanguagePathIsNoDirectoryException(array($langInstance, $languageBasePath), self::EXCEPTION_INVALID_PATH_NAME);
  82                 } elseif (!is_readable($languageBasePath)) {
  83                         // Is not readable
  84                         throw new LanguagePathReadProtectedException(array($langInstance, $languageBasePath), self::EXCEPTION_READ_PROTECED_PATH);
  85                 }
  86
  87                 // Set the base path
  88                 $langInstance->setLanguageBasePath($languageBasePath);
  89
  90                 // Initialize the variable stack
  91                 $langInstance->initLanguageStrings();
  92
  93                 // Set language code from default config
  94                 $langInstance->setLanguageCode(FrameworkConfiguration::getInstance()->getConfigEntry('default_lang'));
  95
  96                 // Remember this instance
  97                 self::$thisInstance = $langInstance;
  98
  99                 // Return the prepared instance
 100                 return $langInstance;
 101         }
 102
 103         /**
 104          * Singleton getter for this instance
 105          *
 106          * @return      $thisInstance   An instance of this class
 107          */
 108         public final static function getInstance () {
 109                 return self::$thisInstance;
 110         }
 111
 112         /**
 113          * Setter for base path
 114          *
 115          * @param       $languageBasePath       The relative base path for all language files
 116          * @return      void
 117          */
 118         protected final function setLanguageBasePath ($languageBasePath) {
 119                 // And set it
 120                 $this->languageBasePath = (string) $languageBasePath;
 121         }
 122
 123         /**
 124          * Setter for language code
 125          *
 126          * @param       $langCode       The language code for the current application
 127          * @return      void
 128          */
 129         protected final function setLanguageCode ($langCode) {
 130                 // Cast it
 131                 $langCode = (string) $langCode;
 132
 133                 // And set it (only 2 chars)
 134                 $this->langCode = substr($langCode, 0, 2);
 135         }
 136
 137         /**
 138          * Initialize the array-object for all later language strings
 139          *
 140          * @return      void
 141          */
 142         public function initLanguageStrings () {
 143                 $this->langStrings = new FrameworkArrayObject("FakedLanguageStrings");
 144         }
 145
 146         /**
 147          * Getter for language code
 148          *
 149          * @return      $langCode       The language code for the current application
 150          */
 151         public final function getLanguageCode () {
 152                 return $this->langCode;
 153         }
 154
 155         /**
 156          * Get the plain message from the cache variable for the given message id
 157          *
 158          * @param       $messageId              The message id we shall find in the cache variable
 159          * @return      $messageText    The plain message text
 160          */
 161         public function getMessage ($messageId) {
 162                 // Default is missing message text
 163                 $messageText = sprintf("!%s!",
 164                         $messageId
 165                 );
 166
 167                 // Try to look it up in the cache variable
 168                 if ($this->langStrings->offsetExists($messageId)) {
 169                         // Return the message string
 170                         $messageText = $this->langStrings->offsetGet($messageId);
 171                 }
 172
 173                 // Return the text
 174                 return $messageText;
 175         }
 176 }
 177
 178 // [EOF]
 179 ?>