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<?php
/**
* Task collection is used as a registry for loaded tasks and handles loading
* and constructing task class objects.
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since CakePHP(tm) v 2.0
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/

App::uses('ObjectCollection', 'Utility');

/**
* Collection object for Tasks. Provides features
* for lazily loading tasks, and firing callbacks on loaded tasks.
*
* @package Cake.Console
*/
class TaskCollection extends ObjectCollection {

/**
* Shell to use to set params to tasks.
*
* @var Shell
*/
protected $_Shell;

/**
* The directory inside each shell path that contains tasks.
*
* @var string
*/
public $taskPathPrefix = 'tasks/';

/**
* Constructor
*
* @param Shell $Shell
*/
public function __construct(Shell $Shell) {
$this->_Shell = $Shell;
}

/**
* Loads/constructs a task. Will return the instance in the collection
* if it already exists.
*
* @param string $task Task name to load
* @param array $settings Settings for the task.
* @return Task A task object, Either the existing loaded task or a new one.
* @throws MissingTaskException when the task could not be found
*/
public function load($task, $settings = array()) {
list($plugin, $name) = pluginSplit($task, true);

if (isset($this->_loaded[$name])) {
return $this->_loaded[$name];
}
$taskClass = $name . 'Task';
App::uses($taskClass, $plugin . 'Console/Command/Task');
if (!class_exists($taskClass)) {
if (!class_exists($taskClass)) {
throw new MissingTaskException(array(
'class' => $taskClass
));
}
}

$this->_loaded[$name] = new $taskClass(
$this->_Shell->stdout, $this->_Shell->stderr, $this->_Shell->stdin
);
return $this->_loaded[$name];
}

}
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