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1 | <?php |
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2 | namespace Redaxscript; |
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3 | |||
4 | use function array_key_exists; |
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5 | |||
6 | /** |
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7 | * abstract class to create a singleton class |
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8 | * |
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9 | * @since 2.2.0 |
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10 | * |
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11 | * @package Redaxscript |
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12 | * @category Singleton |
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13 | * @author Henry Ruhs |
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14 | * |
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15 | * @codeCoverageIgnore |
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16 | */ |
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17 | |||
18 | abstract class Singleton |
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19 | { |
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20 | /** |
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21 | * array of static instances |
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22 | */ |
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23 | |||
24 | protected static array $_instanceArray = []; |
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25 | |||
26 | /** |
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27 | * constructor of the class |
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28 | * |
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29 | * @since 2.2.0 |
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30 | */ |
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31 | |||
32 | private function __construct() |
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33 | { |
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34 | } |
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35 | |||
36 | /** |
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37 | * clone of the class |
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38 | * |
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39 | * @since 5.0.0 |
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40 | */ |
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41 | |||
42 | private function __clone() |
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43 | { |
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44 | } |
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45 | |||
46 | /** |
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47 | * get the instance |
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48 | * |
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49 | * @since 5.0.0 |
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50 | * |
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51 | * @return static |
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52 | */ |
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53 | |||
54 | public static function getInstance() |
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55 | { |
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56 | $className = static::class; |
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57 | |||
58 | /* create instance */ |
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59 | |||
60 | if (!array_key_exists($className, static::$_instanceArray)) |
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61 | { |
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62 | static::$_instanceArray[$className] = new static(); |
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63 | } |
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64 | return static::$_instanceArray[$className]; |
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65 | } |
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66 | |||
67 | /** |
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68 | * clear the instance |
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69 | * |
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70 | * @since 3.0.0 |
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71 | */ |
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72 | |||
73 | public static function clearInstance() : void |
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74 | { |
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75 | $className = static::class; |
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76 | self::$_instanceArray[$className] = null; |
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77 | } |
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78 | } |
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79 |