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Filename : Registry.php
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<?php if ( ! defined( 'WOODMART_THEME_DIR' ) ) {
	exit( 'No direct script access allowed' );}

/**
 * Object Registry
 */
class WOODMART_Registry {
	/**
	 * Holds an instance of the class
	 */
	private static $instance;

	/**
	 * Short names of some know objects
	 *
	 * @var array
	 */
	private $knownObjects = array();

	/**
	 * Restrict direct initialization, use Registry::getInstance() instead
	 */
	private function __construct() {
	}

	/**
	 * Get instance of the object (the singleton method)
	 *
	 * @return  Registry
	 */
	public static function getInstance() {
		if ( ! isset( self::$instance ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}


	/**
	 * Dynamically load missing object and assign it to the Registry property
	 *
	 * @param   string $obj Object name (first char will be converted to upper case)
	 * @return  object
	 */
	function __get( $obj ) {
		if ( ! isset( $this->knownObjects[ $obj ] ) ) {
			try {
				$this->_save_object( $obj );
			} catch ( Exception $e ) {
				echo esc_html( $e->getTraceAsString() );
			}
		}

		return $this->knownObjects[ $obj ];
	}

	private function _save_object( $obj ) {
		if ( function_exists( 'mb_convert_case' ) ) {
			$objname = 'WOODMART_' . mb_convert_case( $obj, MB_CASE_TITLE, 'UTF-8' );
		} else {
			$objname = 'WOODMART_' . ucfirst( $obj );
		}

		if ( is_string( $obj ) && ! isset( $this->$obj ) && class_exists( $objname ) ) {
			$this->knownObjects[ $obj ] = new $objname();
		}
	}

	/**
	 * Prevent users to clone the instance
	 */
	public function __clone() {
		trigger_error( 'Clone is not allowed.', E_USER_ERROR );
	}
}

if ( ! function_exists( 'WOODMART_Registry' ) ) {
	function WOODMART_Registry() {
		return WOODMART_Registry::getInstance();
	}
}