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<?php /** * File containing the ezcBaseInit class. * * @package Base * @version 1.8 * @copyright Copyright (C) 2005-2009 eZ Systems AS. All rights reserved. * @license http://ez.no/licenses/new_bsd New BSD License */ /** * Provides a method to implement delayed initialization of objects. * * With the methods in this class you can implement callbacks to configure * singleton classes. In order to do so you will have to change the * getInstance() method of your singleton class to include a call to * ezcBaseInit::fetchConfig() as in the following example: * * <code> * <?php * public static function getInstance() * { * if ( is_null( self::$instance ) ) * { * self::$instance = new ezcConfigurationmanager(); * ezcBaseInit::fetchConfig( 'ezcInitConfigurationManager', self::$instance ); * } * return self::$instance; * } * ?> * </code> * * You will also need to configure which callback class to call. This you do * with the ezcBaseInit::setCallback() method. The following examples sets the * callback classname for the configuration identifier * 'ezcInitConfigurationManager' to 'cfgConfigurationManager': * * <code> * <?php * ezcBaseInit::setCallback( 'ezcInitConfigurationManager', 'cfgConfigurationManager' ); * ?> * </code> * * The class 'cfgConfigurationManager' is required to implement the * ezcBaseConfigurationInitializer interface, which defines only one method: * configureObject(). An example on how to implement such a class could be: * * <code> * <?php * class cfgConfigurationManager implements ezcBaseConfigurationInitializer * { * static public function configureObject( ezcConfigurationManager $cfgManagerObject ) * { * $cfgManagerObject->init( 'ezcConfigurationIniReader', 'settings', array( 'useComments' => true ) ); * } * } * ?> * </code> * * Of course the implementation of this callback class is up to the application * developer that uses the component (in this example the Configuration * component's class ezcConfigurationManager). * * @package Base * @version 1.8 */ class ezcBaseInit { /** * Contains the callback where the identifier is the key of the array, and the classname to callback to the value. * * @var array(string=>string) */ static private $callbackMap = array(); /** * Adds the classname $callbackClassname as callback for the identifier $identifier. * * @param string $identifier * @param string $callbackClassname */ public static function setCallback( $identifier, $callbackClassname ) { if ( array_key_exists( $identifier, self::$callbackMap ) ) { throw new ezcBaseInitCallbackConfiguredException( $identifier, self::$callbackMap[$identifier] ); } else { // Check if the passed classname actually exists if ( !ezcBaseFeatures::classExists( $callbackClassname, true ) ) { throw new ezcBaseInitInvalidCallbackClassException( $callbackClassname ); } // Check if the passed classname actually implements the interface. if ( !in_array( 'ezcBaseConfigurationInitializer', class_implements( $callbackClassname ) ) ) { throw new ezcBaseInitInvalidCallbackClassException( $callbackClassname ); } self::$callbackMap[$identifier] = $callbackClassname; } } /** * Uses the configured callback belonging to $identifier to configure the $object. * * The method will return the return value of the callback method, or null * in case there was no callback set for the specified $identifier. * * @param string $identifier * @param object $object * @return mixed */ public static function fetchConfig( $identifier, $object ) { if ( isset( self::$callbackMap[$identifier] ) ) { $callbackClassname = self::$callbackMap[$identifier]; return call_user_func( array( $callbackClassname, 'configureObject' ), $object ); } return null; } } ?>
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