class EventArgs

EventArgs is the base class for classes containing event data.

This class contains no event data. It is used by events that do not pass state information to an event handler when an event is raised. The single empty EventArgs instance can be obtained through {@link getEmptyInstance}.

@license http://www.opensource.org/licenses/lgpl-license.php LGPL @link www.doctrine-project.org @since 2.0 @version $Revision: 3938 $ @author Guilherme Blanco <guilhermeblanco@hotmail.com> @author Jonathan Wage <jonwage@gmail.com> @author Roman Borschel <roman@code-factory.org>

Hierarchy

Expanded class hierarchy of EventArgs

4 files declare their use of EventArgs
EventManagerTest.php in drupal/core/vendor/doctrine/common/tests/Doctrine/Tests/Common/EventManagerTest.php
LifecycleEventArgs.php in drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Event/LifecycleEventArgs.php
LoadClassMetadataEventArgs.php in drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Event/LoadClassMetadataEventArgs.php
PreUpdateEventArgs.php in drupal/core/vendor/doctrine/common/lib/Doctrine/Common/Persistence/Event/PreUpdateEventArgs.php

File

drupal/core/vendor/doctrine/common/lib/Doctrine/Common/EventArgs.php, line 39

Namespace

Doctrine\Common
View source
class EventArgs {

  /**
   * @var EventArgs Single instance of EventArgs
   */
  private static $_emptyEventArgsInstance;

  /**
   * Gets the single, empty and immutable EventArgs instance.
   *
   * This instance will be used when events are dispatched without any parameter,
   * like this: EventManager::dispatchEvent('eventname');
   *
   * The benefit from this is that only one empty instance is instantiated and shared
   * (otherwise there would be instances for every dispatched in the abovementioned form)
   *
   * @see EventManager::dispatchEvent
   * @link http://msdn.microsoft.com/en-us/library/system.eventargs.aspx
   * @return EventArgs
   */
  public static function getEmptyInstance() {
    if (!self::$_emptyEventArgsInstance) {
      self::$_emptyEventArgsInstance = new EventArgs();
    }
    return self::$_emptyEventArgsInstance;
  }

}

Members

Namesort descending Modifiers Type Description Overrides
EventArgs::$_emptyEventArgsInstance private static property
EventArgs::getEmptyInstance public static function Gets the single, empty and immutable EventArgs instance.