inc/classes/main/resolver/controller/image/class_ImageControllerResolver.php

   1 <?php
   2 /**
   3  * A resolver for resolving controllers locally
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, this is free software
   8  * @license             GNU GPL 3.0 or any newer version
   9  * @link                http://www.ship-simu.org
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  23  */
  24 class ImageControllerResolver extends BaseControllerResolver implements ControllerResolver {
  25         /**
  26          * Last successfull resolved controller (name)
  27          */
  28         private $lastControllerName = "";
  29
  30         /**
  31          * Last successfull resolved controller (instance)
  32          */
  33         private $lastControllerInstance = null;
  34
  35         /**
  36          * Protected constructor
  37          *
  38          * @return      void
  39          */
  40         protected function __construct () {
  41                 // Call parent constructor
  42                 parent::__construct(__CLASS__);
  43
  44                 // Set prefix to "Image"
  45                 $this->setControllerPrefix("Image");
  46         }
  47
  48         /**
  49          * Creates an instance of a resolver class with a given command
  50          *
  51          * @param       $controllerName                         The controller we shall resolve
  52          * @param       $appInstance                            An instance of a manageable application helper class
  53          * @return      $resolverInstance                       The prepared controller resolver instance
  54          * @throws      EmptyVariableException          Thrown if the default command is not set
  55          * @throws      InvalidControllerException      Thrown if the default controller is invalid
  56          */
  57         public final static function createImageControllerResolver ($controllerName, ManageableApplication $appInstance) {
  58                 // Create the new instance
  59                 $resolverInstance = new ImageControllerResolver();
  60
  61                 // Is the variable $controllerName set and the command is valid?
  62                 if (empty($controllerName)) {
  63                         // Then thrown an exception here
  64                         throw new EmptyVariableException(array($resolverInstance, 'commandName'), self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
  65                 } elseif (!$resolverInstance->isControllerValid($controllerName)) {
  66                         // Invalid command found
  67                         throw new InvalidControllerException(array($resolverInstance, $controllerName), self::EXCEPTION_INVALID_CONTROLLER);
  68                 }
  69
  70                 // Set the application instance
  71                 $resolverInstance->setApplicationInstance($appInstance);
  72
  73                 // Set command name
  74                 $resolverInstance->setControllerName($controllerName);
  75
  76                 // Return the prepared instance
  77                 return $resolverInstance;
  78         }
  79
  80         /**
  81          * Resolves the default controller of the given command
  82          *
  83          * @return      $controllerInstance             A controller instance for the default
  84          *                                                                      command
  85          * @throws      InvalidControllerInstanceException      Thrown if $controllerInstance
  86          *                                                                                              is invalid
  87          */
  88         public function resolveController () {
  89                 // Init variables
  90                 $controllerName = "";
  91                 $controllerInstance = null;
  92
  93                 // Get the command name
  94                 $controllerName = $this->getControllerName();
  95
  96                 // Get the command
  97                 $controllerInstance = $this->loadController($controllerName);
  98
  99                 // And validate it
 100                 if ((!is_object($controllerInstance)) || (!$controllerInstance instanceof Controller)) {
 101                         // This command has an invalid instance!
 102                         throw new InvalidControllerInstanceException(array($this, $controllerName), self::EXCEPTION_INVALID_CONTROLLER);
 103                 } // END - if
 104
 105                 // Set last controller
 106                 $this->lastControllerInstance = $controllerInstance;
 107
 108                 // Return the maybe resolved instance
 109                 return $controllerInstance;
 110         }
 111
 112         /**
 113          * "Loads" a given controller and instances it if not yet cached. If the
 114          * controller was not found one of the default controllers will be used
 115          * depending on wether news shall be displayed.
 116          *
 117          * @param       $controllerName                 A controller name we shall look for
 118          * @return      $controllerInstance             A loaded controller instance
 119          * @throws      InvalidControllerException      Thrown if even the requested
 120          *                                                                              controller class is missing (bad!)
 121          */
 122         private function loadController ($controllerName) {
 123                 // Cache default command
 124                 $defaultController = $this->getConfigInstance()->readConfig('default_image_command');
 125
 126                 // Init controller instance
 127                 $controllerInstance = null;
 128
 129                 // Default controller
 130                 $this->setClassName($defaultController);
 131
 132                 // Generate the class name
 133                 //* DEBUG: */ echo __METHOD__.": Controller=".$controllerName;
 134                 if ($controllerName != $defaultController) {
 135                         // Create controller class name
 136                         $this->setClassName(sprintf("Image%sController",
 137                                 $this->convertToClassName($controllerName)
 138                         ));
 139                 } // END - if
 140                 //* DEBUG: */ echo ", controller=".$this->getClassName()."<br />\n";
 141
 142                 // Is this class loaded?
 143                 if (!class_exists($this->getClassName())) {
 144                         // Class not found, so or throw an exception
 145                         throw new InvalidControllerException(array($this, $controllerName), self::EXCEPTION_INVALID_CONTROLLER);
 146                 } // END - if
 147
 148                 // Initiate the resolver and controller
 149                 $resolverInstance = ObjectFactory::createObjectByConfiguredName('image_cmd_resolver_class', array($controllerName, $this->getApplicationInstance()));
 150                 $controllerInstance = ObjectFactory::createObjectByName($this->getClassName(), array($resolverInstance));
 151
 152                 // Remove resolver
 153                 unset($resolverInstance);
 154
 155                 // Return the result
 156                 return $controllerInstance;
 157         }
 158 }
 159
 160 // [EOF]
 161 ?>