<?php
/**
 * Singleton Trait File
 *
 * @package Airy_Frontend_Forms
 */

// If this file is called directly, abort.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}
/**
 * Singleton pattern trait
 *
 * @package Airy_Frontend_Forms
 */

trait AFFCF_Singleton {
	/**
	 * Instance
	 *
	 * @var object.
	 */
	private static $instance = null;
	/**
	 * Get instance
	 *
	 * @return object Instance.
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}
	/**
	 * Private constructor to prevent direct instantiation
	 */
	private function __construct() {
		$this->init();
	}
	/**
	 * Prevent cloning
	 */
	private function __clone() {
		_doing_it_wrong(
			__FUNCTION__,
			esc_html__( 'Cloning is forbidden.', 'airy-frontend-forms' ),
			esc_html( AFFCF_VERSION )
		);
	}
	/**
	 * Prevent unserialization
	 */
	public function __wakeup() {
		_doing_it_wrong(
			__FUNCTION__,
			esc_html__( 'Unserializing instances is forbidden.', 'airy-frontend-forms' ),
			esc_html( AFFCF_VERSION )
		);
	}
	/**
	 * Initialize
	 * Override this method in child classes
	 */
	protected function init() {
		// To be implemented by child class.
	}
}