File: include/patterns/Factory.lib

<?php

/*
    Factory.lib, DomCore, the WebAbility(r) Core System
    Contains the Factory pattern class
    (c) 2008-2012 Philippe Thomassigny

    This file is part of DomCore

    DomCore is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    DomCore is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with DomCore.  If not, see <http://www.gnu.org/licenses/>.
*/

/* @UML_Box -- Do not edit
|------------------------------------------------------------------|
| Factory : Factory pattern                                        |
|------------------------------------------------------------------|
| - $catalog: array                                                |
|------------------------------------------------------------------|
| + new Factory($defaultcatalog: array)                            |
| + newProduct($parameter: mixed[, $arg, $arg, ...])               |
| + registerProduct($id: mixed, $class: string)                    |
| + unregisterProduct($id: mixed)                                  |
| # classLoader($class: string)                                    |
|------------------------------------------------------------------|
@End_UML_Box */


class Factory extends WAObject
{
  private $catalog = array();

  public function __construct($default = null)
  {
    parent::__construct();
    if ($default)
      $this->catalog = $default;
  }

  public function newProduct($parameter)
  {
    if (isset($this->catalog[$parameter]))
    {
      // we load/include the class if needed (user overloaded)
      if (!class_exists($this->catalog[$parameter]))
      {
        $this->classLoader($this->catalog[$parameter]);
      }
      // We create new instante with parameters
      $args = func_get_args();
      array_shift($args);
      $reflection = new ReflectionClass($this->catalog[$parameter]);
      $instance = call_user_func_array(array(&$reflection, 'newInstance'), $args);
      return $instance;
    }
    return null;
  }

  public function registerProduct($id, $class)
  {
    $this->catalog[$id] = $class;
  }

  public function unregisterProduct($id)
  {
    if (isset($this->catalog[$id]))
      unset($this->catalog[$id]);
  }

  protected function classLoader($class)
  {
    // nothing by default, we relay on __autoload()
    // If you use not-so-easily accessible classes, please overload this method in your extended factory
  }

}

?>