wpvr / admin / views / class-wpvr-singleton.php

class-wpvr-singleton.php in WPVR – 360 Panorama viewer and Virtual Tour Builder for WordPress 8.5.74, at admin/views/class-wpvr-singleton.php

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1	<?php
2	if ( ! defined( 'ABSPATH' ) ) exit; // Exit if accessed directly
3	/**
4	* The abstract class for maintaing singleton design pattern
5	*
6	* @link http://rextheme.com/
7	* @since 8.0.0
8	*
9	* @package Wpvr
10	* @subpackage Wpvr/admin/views
11	*/
12
13	/**
14	* Orginial Singleton class
15	*/
16	abstract class Singleton {
17
18	/**
19	* Any Singleton class
20	*
21	* @var Singleton[] $instances
22	* @since 8.0.0
23	*/
24	private static $instances = array();
25
26
27	/**
28	* Private construct to avoid 'new'
29	*
30	* @since 8.0.0
31	*/
32	private function __construct()
33	{
34
35	}
36
37
38	/**
39	* Get Instacne
40	*
41	* @return Singleton
42	* @since 8.0.0
43	*/
44	final public static function get_instance() {
45	$class = get_called_class();
46
47	if ( ! isset( $instances[ $class ] ) ) {
48	self::$instances[ $class ] = new $class();
49	}
50
51	return self::$instances[ $class ];
52	}
53
54
55	/**
56	* Declared to overwrite magic method __clone()
57	* In order to prevent object cloning
58	*
59	* @return void
60	* @since 8.0.0
61	*/
62	private function __clone()
63	{
64	// Do nothing
65	}
66
67
68	/**
69	* Declared to overwrite magic method __sleep()
70	* In order to avoid serialize instance
71	*
72	* @return void
73	* @since 8.0.0
74	*/
75	public function __sleep()
76	{
77	// Do nothing
78	}
79
80
81	/**
82	* Declared to overwrite magic method __wakeup()
83	* In order to avoid unserialize instance
84	*
85	* @return void
86	* @since 8.0.0
87	*/
88	public function __wakeup()
89	{
90	// Do nothing
91	}
92
93
94	/**
95	* Responsible for rendering setting tabs
96	*
97	* @param array $postdata
98	*
99	* @return void
100	* @since 8.0.0
101	*/
102	abstract static public function render($postdata);
103
104	/**
105	* Responsible for rendering setting meta fields
106	*
107	* @param array $postdata
108	*
109	* @return void
110	* @since 8.0.0
111	*/
112	abstract static public function render_meta_fields($postdata);
113	}