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1b4c445cad
git-svn-id: https://svn.cakephp.org/repo/branches/1.2.x.x@6585 3807eeeb-6ff5-0310-8944-8be069107fe0
309 lines
No EOL
8.2 KiB
PHP
309 lines
No EOL
8.2 KiB
PHP
<?php
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/* SVN FILE: $Id$ */
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/**
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* Class collections.
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*
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* A repository for class objects, each registered with a key.
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*
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* PHP versions 4 and 5
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*
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* CakePHP(tm) : Rapid Development Framework <http://www.cakephp.org/>
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* Copyright 2005-2008, Cake Software Foundation, Inc.
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* 1785 E. Sahara Avenue, Suite 490-204
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* Las Vegas, Nevada 89104
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*
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* Licensed under The MIT License
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* Redistributions of files must retain the above copyright notice.
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*
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* @filesource
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* @copyright Copyright 2005-2008, Cake Software Foundation, Inc.
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* @link http://www.cakefoundation.org/projects/info/cakephp CakePHP(tm) Project
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* @package cake
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* @subpackage cake.cake.libs
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* @since CakePHP(tm) v 0.9.2
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* @version $Revision$
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* @modifiedby $LastChangedBy$
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* @lastmodified $Date$
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License
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*/
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/**
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* Class Collections.
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*
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* A repository for class objects, each registered with a key.
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* If you try to add an object with the same key twice, nothing will come of it.
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* If you need a second instance of an object, give it another key.
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*
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* @package cake
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* @subpackage cake.cake.libs
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*/
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class ClassRegistry {
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/**
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* Names of classes with their objects.
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*
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* @var array
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* @access private
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*/
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var $__objects = array();
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/**
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* Names of class names mapped to the object in the registry.
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*
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* @var array
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* @access private
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*/
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var $__map = array();
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/**
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* Return a singleton instance of the ClassRegistry.
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*
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* @return ClassRegistry instance
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* @access public
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*/
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function &getInstance() {
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static $instance = array();
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if (!$instance) {
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$instance[0] =& new ClassRegistry();
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}
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return $instance[0];
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}
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/**
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* Loads a class, registers the object in the registry and returns instance of the object.
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*
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*
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* @param mixed $class as a string or a single key => value array instance will be created, stored in the registry and returned.
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* Required: array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry', 'type' => 'TypeOfClass');
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* Model Classes can accept optional array('id' => $id, 'table' => $table, 'ds' => $ds, 'alias' => $alias);
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* When $class is a numeric keyed array, multiple class instances will be stored in the registry, no instance of the object will be returned
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* array(
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* array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry', 'type' => 'TypeOfClass'),
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* array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry', 'type' => 'TypeOfClass'),
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* array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry', 'type' => 'TypeOfClass'));
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*
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* @param string $type TypeOfClass
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* @return object intance of ClassName
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*/
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function &init($class, $type = null) {
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$_this =& ClassRegistry::getInstance();
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$id = $false = false;
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$table = $ds = $alias = $plugin = null;
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$options = null;
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$true = true;
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if (!$type) {
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$type = 'Model';
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}
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if (is_array($class)) {
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$objects = $class;
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if (!isset($class[0])) {
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$objects = array($class);
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}
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} else {
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$objects = array(array('class' => $class));
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}
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$count = count($objects);
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foreach ($objects as $key => $settings) {
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if (is_array($settings)) {
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$plugin = null;
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$settings = array_merge(array('id' => false, 'table' => null, 'ds' => null, 'alias' => null, 'name' => null), $settings);
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extract($settings, EXTR_OVERWRITE);
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if (strpos($class, '.') !== false) {
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list($plugin, $class) = explode('.', $class);
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$plugin = $plugin . '.';
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}
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if (empty($alias)) {
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$alias = $class;
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}
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if ($_this->_duplicate($alias, $class) && $count == 1) {
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$_this->map($alias, $class);
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return $_this->getObject($alias);
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}
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if ($type === 'Model') {
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$options = array('id' => $id, 'table' => $table, 'ds' => $ds, 'alias' => $alias, 'name' => $class);
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}
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if (App::import($type, $plugin . $class)) {
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${$class} =& new $class($options);
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} elseif ($type === 'Model') {
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if ($plugin && class_exists($plugin .'AppModel')) {
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$appModel = $plugin .'AppModel';
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} else {
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$appModel = 'AppModel';
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}
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${$class} =& new $appModel($options);
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}
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if (!isset(${$class})) {
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trigger_error(sprintf(__('(ClassRegistry::init() could not create instance of %1$s class %2$s ', true), $class, $type), E_USER_WARNING);
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return $false;
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}
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if ($type !== 'Model') {
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$_this->addObject($alias, ${$class});
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} else {
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$_this->map($alias, $class);
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}
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} elseif (is_numeric($settings)) {
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trigger_error(__('(ClassRegistry::init() Attempted to create instance of a class with a numeric name', true), E_USER_WARNING);
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return $false;
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}
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}
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if ($count > 1) {
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return $true;
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}
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return ${$class};
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}
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/**
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* Add $object to the registry, associating it with the name $key.
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*
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* @param string $key Key for the object in registry
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* @param mixed $object Object to store
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* @return boolean True if the object was written, false if $key already exists
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* @access public
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*/
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function addObject($key, &$object) {
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$_this =& ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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if (array_key_exists($key, $_this->__objects) === false) {
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$_this->__objects[$key] = &$object;
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return true;
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}
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return false;
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}
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/**
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* Remove object which corresponds to given key.
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*
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* @param string $key Key of object to remove from registry
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* @access public
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*/
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function removeObject($key) {
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$_this =& ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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if (array_key_exists($key, $_this->__objects) === true) {
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unset($_this->__objects[$key]);
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}
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}
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/**
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* Returns true if given key is present in the ClassRegistry.
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*
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* @param string $key Key to look for
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* @return boolean true if key exists in registry, false otherwise
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* @access public
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*/
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function isKeySet($key) {
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$_this =& ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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if (array_key_exists($key, $_this->__objects)) {
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return true;
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} elseif (array_key_exists($key, $_this->__map)) {
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return true;
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}
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return false;
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}
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/**
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* Get all keys from the regisrty.
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*
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* @return array Set of keys stored in registry
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* @access public
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*/
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function keys() {
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$_this =& ClassRegistry::getInstance();
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return array_keys($_this->__objects);
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}
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/**
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* Return object which corresponds to given key.
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*
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* @param string $key Key of object to look for
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* @return mixed Object stored in registry
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* @access public
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*/
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function &getObject($key) {
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$_this =& ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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if (isset($_this->__objects[$key])) {
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return $_this->__objects[$key];
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} else {
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$key = $_this->__getMap($key);
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if (isset($_this->__objects[$key])) {
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return $_this->__objects[$key];
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}
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}
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$return = false;
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return $return;
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}
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/**
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* Checks to see if $alias is a duplicate $class Object
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*
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* @param string $alias
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* @param string $class
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* @return boolean
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*/
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function _duplicate($alias, $class) {
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$_this =& ClassRegistry::getInstance();
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$duplicate = false;
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if ($_this->isKeySet($alias)) {
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$model = $_this->getObject($alias);
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if (is_a($model, $class)) {
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$duplicate = true;
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}
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unset($model);
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}
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return $duplicate;
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}
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/**
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* Add a key name pair to the registry to map name to class in the regisrty.
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*
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* @param string $key Key to include in map
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* @param string $name Key that is being mapped
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* @access public
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*/
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function map($key, $name) {
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$_this =& ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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$name = Inflector::underscore($name);
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if (array_key_exists($key, $_this->__map) === false) {
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$_this->__map[$key] = $name;
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}
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}
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/**
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* Get all keys from the map in the regisrty.
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*
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* @return array Keys of registry's map
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* @access public
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*/
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function mapKeys() {
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$_this =& ClassRegistry::getInstance();
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return array_keys($_this->__map);
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}
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/**
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* Return the name of a class in the registry.
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*
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* @param string $key Key to find in map
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* @return string Mapped value
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* @access private
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*/
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function __getMap($key) {
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$_this =& ClassRegistry::getInstance();
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if (array_key_exists($key, $_this->__map)) {
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return $_this->__map[$key];
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}
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}
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/**
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* Flushes all objects from the ClassRegistry.
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*
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* @access public
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*/
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function flush() {
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$_this =& ClassRegistry::getInstance();
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$_this->__objects = array();
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$_this->__map = array();
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}
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}
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?>
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