inc/classes/main/resolver/controller/class_BaseControllerResolver.php

   1 <?php
   2 /**
   3  * A generic controller resolver class
   4  *
   5  * @author              Roland Haeder <webmaster@ship-simu.org>
   6  * @version             0.0.0
   7  * @copyright   Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2011 Core Developer Team
   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 BaseControllerResolver extends BaseResolver {
  25         /**
  26          * Validated controller name
  27          */
  28         private $controllerName = '';
  29
  30         /**
  31          * Protected constructor
  32          *
  33          * @param       $className      Name of the real class
  34          * @return      void
  35          */
  36         protected function __construct ($className) {
  37                 // Call parent constructor
  38                 parent::__construct($className);
  39         }
  40
  41         /**
  42          * Setter for controller name
  43          *
  44          * @param       $controllerName         Last validated controller name
  45          * @return      void
  46          */
  47         protected final function setControllerName ($controllerName) {
  48                 $this->controllerName = $controllerName;
  49         }
  50
  51         /**
  52          * Getter for controller name
  53          *
  54          * @return      $controllerName Last validated controller name
  55          */
  56         public final function getControllerName () {
  57                 return $this->controllerName;
  58         }
  59
  60         /**
  61          * "Loads" a given controller and instances it if not yet cached. If the
  62          * controller was not found one of the default controllers will be used
  63          * depending on whether news shall be displayed.
  64          *
  65          * @param       $controllerName                 A controller name we shall look for
  66          * @return      $controllerInstance             A loaded controller instance
  67          * @throws      InvalidControllerException      Thrown if even the requested
  68          *                                                                              controller class is missing (bad!)
  69          */
  70         protected function loadController ($controllerName) {
  71                 // Cache default command
  72                 $defaultController = $this->getConfigInstance()->getConfigEntry('default_' . strtolower($this->getClassPrefix()) . '_command');
  73
  74                 // Init controller instance
  75                 $controllerInstance = NULL;
  76
  77                 // Default controller
  78                 $this->setClassName($this->getClassPrefix() . 'DefaultNewsController');
  79
  80                 // Generate the class name
  81                 //* DEBUG: */ $this->debugOutput('BEFORE: controller=' . $controllerName);
  82                 if ($controllerName != $defaultController) {
  83                         // Create controller class name
  84                         $className = $this->getClassPrefix() . $this->convertToClassName($controllerName) . 'Controller';
  85
  86                         // ... and set it
  87                         $this->setClassName($className);
  88                 } else {
  89                         // No news at main command or non-news command
  90                         $this->setClassName($this->getClassPrefix() . 'DefaultNewsController');
  91                 }
  92                 //* DEBUG: */ $this->debugOutput('AFTER: controller=' . $this->getClassName());
  93
  94                 // Is this class loaded?
  95                 if (!class_exists($this->getClassName())) {
  96                         // Throw an exception here
  97                         throw new InvalidControllerException(array($this, $controllerName), self::EXCEPTION_INVALID_CONTROLLER);
  98                 } // END - if
  99
 100                 // Set default resolver config name
 101                 $resolverConfigEntry = '';
 102
 103                 // Try to read a config entry for our resolver including controller name... ;-)
 104                 $resolverConfigEntry = sprintf("%s_cmd_%s_resolver_class", strtolower($this->getClassPrefix()), strtolower($controllerName));
 105
 106                 // Get the config, this will throw an exception if there is no special command resolver
 107                 $resolverClass = $this->getConfigInstance()->getConfigEntry($resolverConfigEntry);
 108
 109                 // Initiate the resolver and controller
 110                 $resolverInstance = ObjectFactory::createObjectByConfiguredName(
 111                         $resolverConfigEntry,
 112                         array(
 113                                 $controllerName,
 114                                 $this->getApplicationInstance()
 115                         )
 116                 );
 117                 $controllerInstance = ObjectFactory::createObjectByName(
 118                         $this->getClassName(),
 119                         array($resolverInstance)
 120                 );
 121
 122                 // Return the result
 123                 return $controllerInstance;
 124         }
 125
 126         /**
 127          * Checks whether the given controller is valid
 128          *
 129          * @param       $controllerName         The default controller we shall execute
 130          * @return      $isValid                        Whether the given controller is valid
 131          * @throws      EmptyVariableException          Thrown if given controller is not set
 132          * @throws      DefaultControllerException      Thrown if default controller was not found
 133          */
 134         public function isControllerValid ($controllerName) {
 135                 // By default nothing shall be valid
 136                 $isValid = false;
 137
 138                 // Is a controller set?
 139                 if (empty($controllerName)) {
 140                         // Then thrown an exception here
 141                         throw new EmptyVariableException(array($this, 'controllerName'), self::EXCEPTION_UNEXPECTED_EMPTY_STRING);
 142                 } // END - if
 143
 144                 // Create class name
 145                 $className = $this->getClassPrefix() . $this->convertToClassName($controllerName) . 'Controller';
 146
 147                 // Now, let us create the full name of the controller class
 148                 $this->setClassName($className);
 149
 150                 // Try it hard to get an controller
 151                 while ($isValid === false) {
 152                         // Is this class already loaded?
 153                         if (class_exists($this->getClassName())) {
 154                                 // This class does exist. :-)
 155                                 $isValid = true;
 156                         } elseif ($this->getClassName() != $this->getClassPrefix() . 'DefaultNewsController') {
 157                                 // Set default controller
 158                                 $this->setClassName($this->getClassPrefix() . 'DefaultNewsController');
 159                         } else {
 160                                 // All is tried, give it up here
 161                                 throw new DefaultControllerException($this, self::EXCEPTION_DEFAULT_CONTROLLER_GONE);
 162                         }
 163                 } // END - while
 164
 165                 // Return the result
 166                 return $isValid;
 167         }
 168 }
 169
 170 // [EOF]
 171 ?>