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   1  <?php
   2  /*
   3   * Limb PHP Framework
   4   *
   5   * @link http://limb-project.com 
   6   * @copyright  Copyright &copy; 2004-2007 BIT(http://bit-creative.com)
   7   * @license    LGPL http://www.gnu.org/copyleft/lesser.html 
   8   */
   9  lmb_require('limb/core/src/exception/lmbException.class.php');
  10  
  11  /**
  12   * Registry pattern implementation.
  13   * Allows to store any information and get access to it in any point of application
  14   * Supports saving and restoring (acts like programming stack) that is usefull for testing
  15   * Completely static class
  16   * @link http://www.phppatterns.com/docs/design/the_registry
  17   * @package toolkit
  18   * @version $Id: lmbRegistry.class.php 5945 2007-06-06 08:31:43Z pachanga $
  19   */
  20  class lmbRegistry
  21  {
  22    protected static $cache = array(array());
  23  
  24    /**

  25    * Adds a value to the registry

  26    * @param string key

  27    * @param mixed value

  28    */
  29    static function set($name, $value)
  30    {
  31      self :: $cache[$name][0] = $value;
  32    }
  33  
  34    /**

  35    * Returns value from the registry

  36    * @param string key

  37    * @return mixed

  38    */
  39    static function get($name)
  40    {
  41      if(isset(self :: $cache[$name][0]))
  42        return self :: $cache[$name][0];
  43    }
  44  
  45    /**

  46    * Moves all registry entries one level deeper in cache stack

  47    * @param string key

  48    * @return void

  49    */
  50    static function save($name)
  51    {
  52      if(isset(self :: $cache[$name]))
  53        array_unshift(self :: $cache[$name], array());
  54      else
  55        throw new lmbException('no such registry entry', array('name' => $name));
  56    }
  57  
  58    /**

  59    * Moves all registry entries one level up in cache stack

  60    * @param string key

  61    * @return void

  62    */
  63    static function restore($name)
  64    {
  65      if(isset(self :: $cache[$name]))
  66        array_shift(self :: $cache[$name]);
  67      else
  68        throw new lmbException('no such registry entry', array('name' => $name));
  69    }
  70  }
  71  ?>