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pictcode / lib / Cake / Core / CakePlugin.php @ 0b1b8047

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<?php
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/**
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 * CakePlugin class
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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.Core
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 * @since         CakePHP(tm) v 2.0.0
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 * @license       http://www.opensource.org/licenses/mit-license.php MIT License
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 */
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/**
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 * CakePlugin is responsible for loading and unloading plugins. It also can
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 * retrieve plugin paths and load their bootstrap and routes files.
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 *
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 * @package       Cake.Core
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 * @link http://book.cakephp.org/2.0/en/plugins.html
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 */
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class CakePlugin {
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/**
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 * Holds a list of all loaded plugins and their configuration
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 *
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 * @var array
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 */
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        protected static $_plugins = array();
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/**
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 * Loads a plugin and optionally loads bootstrapping, routing files or loads an initialization function
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 *
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 * Examples:
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 *
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 * `CakePlugin::load('DebugKit')`
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 *
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 * Will load the DebugKit plugin and will not load any bootstrap nor route files
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 *
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 * `CakePlugin::load('DebugKit', array('bootstrap' => true, 'routes' => true))`
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 *
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 * will load the bootstrap.php and routes.php files
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 *
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 * `CakePlugin::load('DebugKit', array('bootstrap' => false, 'routes' => true))`
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 *
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 * will load routes.php file but not bootstrap.php
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 *
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 * `CakePlugin::load('DebugKit', array('bootstrap' => array('config1', 'config2')))`
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 *
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 * will load config1.php and config2.php files
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 *
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 * `CakePlugin::load('DebugKit', array('bootstrap' => 'aCallableMethod'))`
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 *
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 * will run the aCallableMethod function to initialize it
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 *
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 * Bootstrap initialization functions can be expressed as a PHP callback type,
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 * including closures. Callbacks will receive two parameters
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 * (plugin name, plugin configuration)
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 *
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 * It is also possible to load multiple plugins at once. Examples:
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 *
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 * `CakePlugin::load(array('DebugKit', 'ApiGenerator'))`
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 *
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 * will load the DebugKit and ApiGenerator plugins
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 *
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 * `CakePlugin::load(array('DebugKit', 'ApiGenerator'), array('bootstrap' => true))`
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 *
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 * will load bootstrap file for both plugins
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 *
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 * ```
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 *         CakePlugin::load(array(
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 *                 'DebugKit' => array('routes' => true),
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 *                 'ApiGenerator'
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 *                 ), array('bootstrap' => true))
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 * ```
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 *
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 * Will only load the bootstrap for ApiGenerator and only the routes for DebugKit.
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 * By using the `path` option you can specify an absolute path to the plugin. Make
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 * sure that the path is slash terminated or your plugin will not be located properly.
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 *
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 * @param string|array $plugin name of the plugin to be loaded in CamelCase format or array or plugins to load
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 * @param array $config configuration options for the plugin
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 * @throws MissingPluginException if the folder for the plugin to be loaded is not found
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 * @return void
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 */
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        public static function load($plugin, $config = array()) {
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                if (is_array($plugin)) {
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                        foreach ($plugin as $name => $conf) {
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                                list($name, $conf) = (is_numeric($name)) ? array($conf, $config) : array($name, $conf);
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                                static::load($name, $conf);
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                        }
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                        return;
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                }
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                $config += array('bootstrap' => false, 'routes' => false, 'ignoreMissing' => false);
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                if (empty($config['path'])) {
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                        foreach (App::path('plugins') as $path) {
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                                if (is_dir($path . $plugin)) {
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                                        static::$_plugins[$plugin] = $config + array('path' => $path . $plugin . DS);
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                                        break;
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                                }
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                                //Backwards compatibility to make easier to migrate to 2.0
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                                $underscored = Inflector::underscore($plugin);
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                                if (is_dir($path . $underscored)) {
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                                        static::$_plugins[$plugin] = $config + array('path' => $path . $underscored . DS);
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                                        break;
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                                }
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                        }
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                } else {
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                        static::$_plugins[$plugin] = $config;
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                }
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                if (empty(static::$_plugins[$plugin]['path'])) {
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                        throw new MissingPluginException(array('plugin' => $plugin));
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                }
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                if (!empty(static::$_plugins[$plugin]['bootstrap'])) {
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                        static::bootstrap($plugin);
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                }
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        }
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/**
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 * Will load all the plugins located in the configured plugins folders
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 * If passed an options array, it will be used as a common default for all plugins to be loaded
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 * It is possible to set specific defaults for each plugins in the options array. Examples:
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 *
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 * ```
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 *         CakePlugin::loadAll(array(
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 *                 array('bootstrap' => true),
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 *                 'DebugKit' => array('routes' => true, 'bootstrap' => false),
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 *         ))
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 * ```
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 *
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 * The above example will load the bootstrap file for all plugins, but for DebugKit it will only load
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 * the routes file and will not look for any bootstrap script. If you are loading
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 * many plugins that inconsistently support routes/bootstrap files, instead of detailing
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 * each plugin you can use the `ignoreMissing` option:
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 *
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 * ```
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 * CakePlugin::loadAll(array(
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 *   'ignoreMissing' => true,
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 *   'bootstrap' => true,
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 *   'routes' => true,
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 * ));
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 * ```
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 *
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 * The ignoreMissing option will do additional file_exists() calls but is simpler
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 * to use.
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 *
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 * @param array $options Options list. See CakePlugin::load() for valid options.
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 * @return void
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 */
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        public static function loadAll($options = array()) {
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                $plugins = App::objects('plugins');
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                foreach ($plugins as $p) {
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                        $opts = isset($options[$p]) ? (array)$options[$p] : array();
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                        if (isset($options[0])) {
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                                $opts += $options[0];
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                        }
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                        static::load($p, $opts);
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                }
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        }
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/**
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 * Returns the filesystem path for a plugin
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 *
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 * @param string $plugin name of the plugin in CamelCase format
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 * @return string path to the plugin folder
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 * @throws MissingPluginException if the folder for plugin was not found or plugin has not been loaded
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 */
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        public static function path($plugin) {
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                if (empty(static::$_plugins[$plugin])) {
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                        throw new MissingPluginException(array('plugin' => $plugin));
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                }
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                return static::$_plugins[$plugin]['path'];
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        }
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/**
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 * Loads the bootstrapping files for a plugin, or calls the initialization setup in the configuration
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 *
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 * @param string $plugin name of the plugin
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 * @return mixed
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 * @see CakePlugin::load() for examples of bootstrap configuration
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 */
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        public static function bootstrap($plugin) {
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                $config = static::$_plugins[$plugin];
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                if ($config['bootstrap'] === false) {
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                        return false;
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                }
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                if (is_callable($config['bootstrap'])) {
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                        return call_user_func_array($config['bootstrap'], array($plugin, $config));
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                }
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                $path = static::path($plugin);
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                if ($config['bootstrap'] === true) {
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                        return static::_includeFile(
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                                $path . 'Config' . DS . 'bootstrap.php',
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                                $config['ignoreMissing']
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                        );
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                }
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                $bootstrap = (array)$config['bootstrap'];
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                foreach ($bootstrap as $file) {
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                        static::_includeFile(
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                                $path . 'Config' . DS . $file . '.php',
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                                $config['ignoreMissing']
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                        );
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                }
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                return true;
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        }
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/**
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 * Loads the routes file for a plugin, or all plugins configured to load their respective routes file
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 *
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 * @param string $plugin name of the plugin, if null will operate on all plugins having enabled the
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 * loading of routes files
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 * @return bool
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 */
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        public static function routes($plugin = null) {
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                if ($plugin === null) {
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                        foreach (static::loaded() as $p) {
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                                static::routes($p);
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                        }
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                        return true;
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                }
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                $config = static::$_plugins[$plugin];
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                if ($config['routes'] === false) {
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                        return false;
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                }
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                return (bool)static::_includeFile(
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                        static::path($plugin) . 'Config' . DS . 'routes.php',
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                        $config['ignoreMissing']
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                );
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        }
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/**
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 * Returns true if the plugin $plugin is already loaded
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 * If plugin is null, it will return a list of all loaded plugins
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 *
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 * @param string $plugin Plugin name to check.
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 * @return mixed boolean true if $plugin is already loaded.
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 * If $plugin is null, returns a list of plugins that have been loaded
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 */
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        public static function loaded($plugin = null) {
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                if ($plugin) {
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                        return isset(static::$_plugins[$plugin]);
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                }
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                $return = array_keys(static::$_plugins);
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                sort($return);
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                return $return;
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        }
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/**
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 * Forgets a loaded plugin or all of them if first parameter is null
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 *
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 * @param string $plugin name of the plugin to forget
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 * @return void
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 */
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        public static function unload($plugin = null) {
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                if ($plugin === null) {
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                        static::$_plugins = array();
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                } else {
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                        unset(static::$_plugins[$plugin]);
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                }
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        }
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/**
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 * Include file, ignoring include error if needed if file is missing
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 *
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 * @param string $file File to include
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 * @param bool $ignoreMissing Whether to ignore include error for missing files
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 * @return mixed
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 */
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        protected static function _includeFile($file, $ignoreMissing = false) {
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                if ($ignoreMissing && !is_file($file)) {
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                        return false;
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                }
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                return include $file;
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        }
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}