371 lines
10 KiB
PHP
371 lines
10 KiB
PHP
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<?php
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/**
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* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
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* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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*
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* Licensed under The MIT License
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* For full copyright and license information, please see the LICENSE.txt
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* Redistributions of files must retain the above copyright notice.
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*
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* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
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* @link http://cakephp.org CakePHP(tm) Project
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* @package Cake.Utility
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* @since CakePHP(tm) v 0.9.2
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* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
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*/
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/**
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* Included libraries.
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*/
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App::uses('Model', 'Model');
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App::uses('AppModel', 'Model');
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App::uses('ConnectionManager', 'Model');
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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.Utility
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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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*/
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protected $_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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*/
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protected $_map = array();
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/**
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* Default constructor parameter settings, indexed by type
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*
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* @var array
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*/
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protected $_config = 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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*/
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public static 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. ClassRegistry::init()
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* is used as a factory for models, and handle correct injecting of settings, that assist in testing.
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*
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* Examples
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* Simple Use: Get a Post model instance ```ClassRegistry::init('Post');```
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*
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* Expanded: ```array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry');```
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*
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* Model Classes can accept optional ```array('id' => $id, 'table' => $table, 'ds' => $ds, 'alias' => $alias);```
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*
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* When $class is a numeric keyed array, multiple class instances will be stored in the registry,
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* no instance of the object will be returned
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* {{{
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* array(
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* array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry'),
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* array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry'),
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* array('class' => 'ClassName', 'alias' => 'AliasNameStoredInTheRegistry')
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* );
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* }}}
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* @param string|array $class as a string or a single key => value array instance will be created,
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* stored in the registry and returned.
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* @param boolean $strict if set to true it will return false if the class was not found instead
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* of trying to create an AppModel
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* @return object instance of ClassName.
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* @throws CakeException when you try to construct an interface or abstract class.
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*/
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public static function init($class, $strict = false) {
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$_this = ClassRegistry::getInstance();
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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' => $class));
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}
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$defaults = array();
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if (isset($_this->_config['Model'])) {
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$defaults = $_this->_config['Model'];
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}
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$count = count($objects);
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$availableDs = null;
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foreach ($objects as $settings) {
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if (is_numeric($settings)) {
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trigger_error(__d('cake_dev', '(ClassRegistry::init() Attempted to create instance of a class with a numeric name'), E_USER_WARNING);
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return false;
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}
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if (is_array($settings)) {
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$pluginPath = null;
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$settings = array_merge($defaults, $settings);
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$class = $settings['class'];
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list($plugin, $class) = pluginSplit($class);
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if ($plugin) {
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$pluginPath = $plugin . '.';
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$settings['plugin'] = $plugin;
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}
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if (empty($settings['alias'])) {
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$settings['alias'] = $class;
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}
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$alias = $settings['alias'];
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$model = $_this->_duplicate($alias, $class);
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if ($model) {
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$_this->map($alias, $class);
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return $model;
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}
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App::uses($plugin . 'AppModel', $pluginPath . 'Model');
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App::uses($class, $pluginPath . 'Model');
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if (class_exists($class) || interface_exists($class)) {
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$reflection = new ReflectionClass($class);
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if ($reflection->isAbstract() || $reflection->isInterface()) {
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throw new CakeException(__d('cake_dev', 'Cannot create instance of %s, as it is abstract or is an interface', $class));
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}
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$testing = isset($settings['testing']) ? $settings['testing'] : false;
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if ($testing) {
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$settings['ds'] = 'test';
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$defaultProperties = $reflection->getDefaultProperties();
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if (isset($defaultProperties['useDbConfig'])) {
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$useDbConfig = $defaultProperties['useDbConfig'];
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if ($availableDs === null) {
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$availableDs = array_keys(ConnectionManager::enumConnectionObjects());
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}
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if (in_array('test_' . $useDbConfig, $availableDs)) {
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$useDbConfig = 'test_' . $useDbConfig;
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}
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if (strpos($useDbConfig, 'test') === 0) {
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$settings['ds'] = $useDbConfig;
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}
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}
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}
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if ($reflection->getConstructor()) {
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$instance = $reflection->newInstance($settings);
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} else {
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$instance = $reflection->newInstance();
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}
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if ($strict && !$instance instanceof Model) {
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$instance = null;
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}
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}
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if (!isset($instance)) {
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$appModel = 'AppModel';
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if ($strict) {
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return false;
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} elseif ($plugin && class_exists($plugin . 'AppModel')) {
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$appModel = $plugin . 'AppModel';
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}
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if (!empty($appModel)) {
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$settings['name'] = $class;
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$instance = new $appModel($settings);
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}
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if (!isset($instance)) {
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trigger_error(__d('cake_dev', '(ClassRegistry::init() could not create instance of %s', $class), E_USER_WARNING);
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return false;
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}
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}
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$_this->map($alias, $class);
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}
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}
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if ($count > 1) {
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return true;
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}
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return $instance;
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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 object $object Object to store
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* @return boolean True if the object was written, false if $key already exists
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*/
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public static function addObject($key, $object) {
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$_this = ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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if (!isset($_this->_objects[$key])) {
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$_this->_objects[$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 $key Key of object to remove from registry
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* @return void
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*/
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public static function removeObject($key) {
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$_this = ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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if (isset($_this->_objects[$key])) {
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unset($_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 $key Key to look for
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* @return boolean true if key exists in registry, false otherwise
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*/
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public static function isKeySet($key) {
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$_this = ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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return isset($_this->_objects[$key]) || isset($_this->_map[$key]);
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}
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/**
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* Get all keys from the registry.
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*
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* @return array Set of keys stored in registry
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*/
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public static function keys() {
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return array_keys(ClassRegistry::getInstance()->_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 $key Key of object to look for
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* @return mixed Object stored in registry or boolean false if the object does not exist.
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*/
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public static function getObject($key) {
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$_this = ClassRegistry::getInstance();
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$key = Inflector::underscore($key);
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$return = false;
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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 $return;
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}
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/**
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* Sets the default constructor parameter for an object type
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*
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* @param string $type Type of object. If this parameter is omitted, defaults to "Model"
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* @param array $param The parameter that will be passed to object constructors when objects
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* of $type are created
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* @return mixed Void if $param is being set. Otherwise, if only $type is passed, returns
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* the previously-set value of $param, or null if not set.
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*/
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public static function config($type, $param = array()) {
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$_this = ClassRegistry::getInstance();
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if (empty($param) && is_array($type)) {
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$param = $type;
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$type = 'Model';
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} elseif (is_null($param)) {
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unset($_this->_config[$type]);
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} elseif (empty($param) && is_string($type)) {
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return isset($_this->_config[$type]) ? $_this->_config[$type] : null;
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}
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if (isset($_this->_config[$type]['testing'])) {
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$param['testing'] = true;
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}
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$_this->_config[$type] = $param;
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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 $class
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* @return boolean
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*/
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protected function &_duplicate($alias, $class) {
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$duplicate = false;
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if ($this->isKeySet($alias)) {
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$model = $this->getObject($alias);
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if (is_object($model) && (is_a($model, $class) || $model->alias === $class)) {
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$duplicate = $model;
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}
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unset($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 registry.
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*
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* @param string $key Key to include in map
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* @param string $name Key that is being mapped
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* @return void
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*/
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public static function map($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 (!isset($_this->_map[$key])) {
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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 registry.
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*
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* @return array Keys of registry's map
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*/
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public static function mapKeys() {
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return array_keys(ClassRegistry::getInstance()->_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 $key Key to find in map
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* @return string Mapped value
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*/
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protected function _getMap($key) {
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if (isset($this->_map[$key])) {
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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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* @return void
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*/
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public static 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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