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   1  <?php
   2  /**
   3   * Zend Framework (http://framework.zend.com/)
   4   *
   5   * @link      http://github.com/zendframework/zf2 for the canonical source repository
   6   * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
   7   * @license   http://framework.zend.com/license/new-bsd New BSD License
   8   */
   9  
  10  namespace Zend\EventManager;
  11  
  12  /**
  13   * Static version of EventManager
  14   */
  15  class StaticEventManager extends SharedEventManager
  16  {
  17      /**
  18       * @var SharedEventManagerInterface
  19       */
  20      protected static $instance;
  21  
  22      /**
  23       * Singleton
  24       */
  25      protected function __construct()
  26      {
  27      }
  28  
  29      /**
  30       * Singleton
  31       *
  32       * @return void
  33       */
  34      private function __clone()
  35      {
  36      }
  37  
  38      /**
  39       * Retrieve instance
  40       *
  41       * @return StaticEventManager
  42       */
  43      public static function getInstance()
  44      {
  45          if (null === static::$instance) {
  46              static::setInstance(new static());
  47          }
  48          return static::$instance;
  49      }
  50  
  51      /**
  52       * Set the singleton to a specific SharedEventManagerInterface instance
  53       *
  54       * @param SharedEventManagerInterface $instance
  55       * @return void
  56       */
  57      public static function setInstance(SharedEventManagerInterface $instance)
  58      {
  59          static::$instance = $instance;
  60      }
  61  
  62      /**
  63       * Is a singleton instance defined?
  64       *
  65       * @return bool
  66       */
  67      public static function hasInstance()
  68      {
  69          return (static::$instance instanceof SharedEventManagerInterface);
  70      }
  71  
  72      /**
  73       * Reset the singleton instance
  74       *
  75       * @return void
  76       */
  77      public static function resetInstance()
  78      {
  79          static::$instance = null;
  80      }
  81  }