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* @license GNU General Public License version 2 or later; see LICENSE */ namespace Joomla\CMS\MVC\Model; \defined('JPATH_PLATFORM') or die; use Joomla\CMS\Object\CMSObject; /** * 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 CMSObject * @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) { $this->state = new CMSObject; } if (!$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 CMSObject; } 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() { } }