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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\MVC\Model;
// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects
/**
* Trait which supports state behavior
*
* @since 4.0.0
*/
trait StateBehaviorTrait
{
/**
* Indicates if the internal state has been set
*
* @var boolean
* @since 4.0.0
*/
protected $__state_set = null;
/**
* A state object
*
* @var State
* @since 4.0.0
*/
protected $state = null;
/**
* Method to get state variables.
*
* @param string $property Optional parameter name
* @param mixed $default Optional default value
*
* @return mixed The property where specified, the state object where omitted
*
* @since 4.0.0
*/
public function getState($property = null, $default = null)
{
if ($this->state === null) {
$this->state = new State();
}
if (!$this->__state_set) {
// Protected method to auto-populate the state
$this->populateState();
// Set the state set flag to true.
$this->__state_set = true;
}
return $property === null ? $this->state : $this->state->get($property, $default);
}
/**
* Method to set state variables.
*
* @param string $property The name of the property
* @param mixed $value The value of the property to set or null
*
* @return mixed The previous value of the property or null if not set
*
* @since 4.0.0
*/
public function setState($property, $value = null)
{
if ($this->state === null) {
$this->state = new State();
}
return $this->state->set($property, $value);
}
/**
* Method to auto-populate the state.
*
* This method should only be called once per instantiation and is designed
* to be called on the first call to the getState() method unless the
* configuration flag to ignore the request is set.
*
* @return void
*
* @note Calling getState in this method will result in recursion.
* @since 4.0.0
*/
protected function populateState()
{
}
}