marc-mabe /
php-enum
| Total Complexity | 53 |
| Total Lines | 389 |
| Duplicated Lines | 0 % |
| Coverage | 97.39% |
| Changes | 0 | ||
Complex classes like Enum often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Enum, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 16 | abstract class Enum |
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| 17 | { |
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| 18 | /** |
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| 19 | * The selected enumerator value |
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| 20 | * |
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| 21 | * @var null|bool|int|float|string |
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| 22 | */ |
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| 23 | private $value; |
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| 24 | |||
| 25 | /** |
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| 26 | * The ordinal number of the enumerator |
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| 27 | * |
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| 28 | * @var null|int |
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| 29 | */ |
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| 30 | private $ordinal; |
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| 31 | |||
| 32 | /** |
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| 33 | * A map of enumerator names and values by enumeration class |
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| 34 | * |
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| 35 | * @var array ["$class" => ["$name" => $value, ...], ...] |
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| 36 | */ |
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| 37 | private static $constants = []; |
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| 38 | |||
| 39 | /** |
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| 40 | * A List of available enumerator names by enumeration class |
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| 41 | * |
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| 42 | * @var array ["$class" => ["$name0", ...], ...] |
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| 43 | */ |
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| 44 | private static $names = []; |
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| 45 | |||
| 46 | /** |
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| 47 | * Already instantiated enumerators |
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| 48 | * |
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| 49 | * @var array ["$class" => ["$name" => $instance, ...], ...] |
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| 50 | */ |
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| 51 | private static $instances = []; |
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| 52 | |||
| 53 | /** |
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| 54 | * Constructor |
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| 55 | * |
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| 56 | * @param null|bool|int|float|string $value The value of the enumerator |
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| 57 | * @param int|null $ordinal The ordinal number of the enumerator |
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| 58 | */ |
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| 59 | 36 | final private function __construct($value, $ordinal = null) |
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| 60 | { |
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| 61 | 36 | $this->value = $value; |
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| 62 | 36 | $this->ordinal = $ordinal; |
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| 63 | 36 | } |
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| 64 | |||
| 65 | /** |
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| 66 | * Get the name of the enumerator |
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| 67 | * |
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| 68 | * @return string |
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| 69 | * @see getName() |
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| 70 | */ |
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| 71 | 1 | public function __toString() |
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| 74 | } |
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| 75 | |||
| 76 | /** |
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| 77 | * @throws LogicException Enums are not cloneable |
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| 78 | * because instances are implemented as singletons |
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| 79 | */ |
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| 80 | 1 | final private function __clone() |
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| 81 | { |
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| 82 | 1 | throw new LogicException('Enums are not cloneable'); |
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| 83 | } |
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| 84 | |||
| 85 | /** |
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| 86 | * @throws LogicException Enums are not serializable |
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| 87 | * because instances are implemented as singletons |
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| 88 | */ |
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| 89 | 1 | final public function __sleep() |
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| 90 | { |
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| 91 | 1 | throw new LogicException('Enums are not serializable'); |
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| 92 | } |
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| 93 | |||
| 94 | /** |
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| 95 | * @throws LogicException Enums are not serializable |
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| 96 | * because instances are implemented as singletons |
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| 97 | */ |
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| 98 | 1 | final public function __wakeup() |
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| 99 | { |
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| 100 | 1 | throw new LogicException('Enums are not serializable'); |
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| 101 | } |
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| 102 | |||
| 103 | /** |
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| 104 | * Get the value of the enumerator |
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| 105 | * |
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| 106 | * @return null|bool|int|float|string |
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| 107 | */ |
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| 108 | 23 | final public function getValue() |
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| 111 | } |
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| 112 | |||
| 113 | /** |
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| 114 | * Get the name of the enumerator |
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| 115 | * |
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| 116 | * @return string |
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| 117 | */ |
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| 118 | 7 | final public function getName() |
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| 122 | } |
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| 123 | |||
| 124 | /** |
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| 125 | * Get the ordinal number of the enumerator |
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| 126 | * |
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| 127 | * @return int |
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| 128 | */ |
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| 129 | 63 | final public function getOrdinal() |
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| 130 | { |
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| 131 | 63 | if ($this->ordinal === null) { |
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| 132 | 19 | $ordinal = 0; |
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| 133 | 19 | $value = $this->value; |
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| 134 | 19 | foreach (self::detectConstants(static::class) as $constValue) { |
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| 135 | 19 | if ($value === $constValue) { |
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| 136 | 19 | break; |
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| 137 | } |
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| 138 | 16 | ++$ordinal; |
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| 139 | } |
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| 140 | |||
| 141 | 19 | $this->ordinal = $ordinal; |
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| 142 | } |
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| 143 | |||
| 144 | 63 | return $this->ordinal; |
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| 145 | } |
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| 146 | |||
| 147 | /** |
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| 148 | * Compare this enumerator against another and check if it's the same. |
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| 149 | * |
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| 150 | * @param mixed $enumerator |
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| 151 | * @return bool |
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| 152 | */ |
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| 153 | 2 | final public function is($enumerator) |
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| 154 | { |
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| 155 | 2 | return $this === $enumerator || $this->value === $enumerator |
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| 156 | |||
| 157 | // The following additional conditions are required only because of the issue of serializable singletons |
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| 158 | 2 | || ($enumerator instanceof static |
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| 159 | 2 | && \get_class($enumerator) === static::class |
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| 160 | 2 | && $enumerator->value === $this->value |
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| 161 | ); |
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| 162 | } |
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| 163 | |||
| 164 | /** |
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| 165 | * Get an enumerator instance of the given enumerator value or instance |
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| 166 | * |
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| 167 | * @param static|null|bool|int|float|string $enumerator |
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| 168 | * @return static |
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| 169 | * @throws InvalidArgumentException On an unknwon or invalid value |
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| 170 | * @throws LogicException On ambiguous constant values |
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| 171 | */ |
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| 172 | 73 | final public static function get($enumerator) |
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| 173 | { |
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| 174 | 73 | if ($enumerator instanceof static && \get_class($enumerator) === static::class) { |
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| 175 | 28 | return $enumerator; |
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| 176 | } |
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| 177 | |||
| 178 | 52 | return static::byValue($enumerator); |
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| 179 | } |
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| 180 | |||
| 181 | /** |
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| 182 | * Get an enumerator instance by the given value |
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| 183 | * |
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| 184 | * @param mixed $value |
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| 185 | * @return static |
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| 186 | * @throws InvalidArgumentException On an unknwon or invalid value |
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| 187 | * @throws LogicException On ambiguous constant values |
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| 188 | */ |
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| 189 | 52 | final public static function byValue($value) |
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| 190 | { |
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| 191 | 52 | $constants = self::detectConstants(static::class); |
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| 192 | 50 | $name = \array_search($value, $constants, true); |
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| 193 | 50 | if ($name === false) { |
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| 194 | 7 | $message = \is_scalar($value) |
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| 195 | 3 | ? 'Unknown value ' . \var_export($value, true) |
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| 196 | 7 | : 'Invalid value of type ' . (\is_object($value) ? \get_class($value) : \gettype($value)); |
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| 197 | 7 | throw new InvalidArgumentException($message); |
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| 198 | } |
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| 199 | |||
| 200 | 44 | if (!isset(self::$instances[static::class][$name])) { |
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| 201 | 17 | self::$instances[static::class][$name] = new static($constants[$name]); |
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| 202 | } |
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| 203 | |||
| 204 | 44 | return self::$instances[static::class][$name]; |
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| 205 | } |
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| 206 | |||
| 207 | /** |
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| 208 | * Get an enumerator instance by the given name |
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| 209 | * |
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| 210 | * @param string $name The name of the enumerator |
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| 211 | * @return static |
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| 212 | * @throws InvalidArgumentException On an invalid or unknown name |
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| 213 | * @throws LogicException On ambiguous values |
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| 214 | */ |
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| 215 | 44 | final public static function byName($name) |
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| 216 | { |
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| 217 | 44 | $name = (string) $name; |
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| 218 | 44 | if (isset(self::$instances[static::class][$name])) { |
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| 219 | 32 | return self::$instances[static::class][$name]; |
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| 220 | } |
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| 221 | |||
| 222 | 17 | $const = static::class . '::' . $name; |
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| 223 | 17 | if (!\defined($const)) { |
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| 224 | 1 | throw new InvalidArgumentException($const . ' not defined'); |
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| 225 | } |
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| 226 | |||
| 227 | 16 | return self::$instances[static::class][$name] = new static(\constant($const)); |
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| 228 | } |
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| 229 | |||
| 230 | /** |
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| 231 | * Get an enumeration instance by the given ordinal number |
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| 232 | * |
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| 233 | * @param int $ordinal The ordinal number or the enumerator |
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| 234 | * @return static |
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| 235 | * @throws InvalidArgumentException On an invalid ordinal number |
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| 236 | * @throws LogicException On ambiguous values |
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| 237 | */ |
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| 238 | 30 | final public static function byOrdinal($ordinal) |
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| 239 | { |
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| 240 | 30 | $ordinal = (int) $ordinal; |
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| 241 | |||
| 242 | 30 | if (!isset(self::$names[static::class])) { |
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| 243 | 2 | self::detectConstants(static::class); |
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| 244 | } |
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| 245 | |||
| 246 | 30 | if (!isset(self::$names[static::class][$ordinal])) { |
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| 247 | 1 | throw new InvalidArgumentException(\sprintf( |
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| 248 | 1 | 'Invalid ordinal number, must between 0 and %s', |
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| 249 | 1 | \count(self::$names[static::class]) - 1 |
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| 250 | )); |
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| 251 | } |
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| 252 | |||
| 253 | 29 | $name = self::$names[static::class][$ordinal]; |
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| 254 | 29 | if (isset(self::$instances[static::class][$name])) { |
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| 255 | 27 | return self::$instances[static::class][$name]; |
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| 256 | } |
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| 257 | |||
| 258 | 3 | $const = static::class . '::' . $name; |
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| 259 | 3 | return self::$instances[static::class][$name] = new static(\constant($const), $ordinal); |
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| 260 | } |
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| 261 | |||
| 262 | /** |
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| 263 | * Get a list of enumerator instances ordered by ordinal number |
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| 264 | * |
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| 265 | * @return static[] |
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| 266 | */ |
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| 267 | 16 | final public static function getEnumerators() |
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| 268 | { |
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| 269 | 16 | if (!isset(self::$names[static::class])) { |
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| 270 | 1 | self::detectConstants(static::class); |
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| 271 | } |
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| 272 | 16 | return \array_map([static::class, 'byName'], self::$names[static::class]); |
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| 273 | } |
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| 274 | |||
| 275 | /** |
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| 276 | * Get a list of enumerator values ordered by ordinal number |
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| 277 | * |
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| 278 | * @return mixed[] |
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| 279 | */ |
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| 280 | 1 | final public static function getValues() |
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| 281 | { |
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| 282 | 1 | return \array_values(self::detectConstants(static::class)); |
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| 283 | } |
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| 284 | |||
| 285 | /** |
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| 286 | * Get a list of enumerator names ordered by ordinal number |
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| 287 | * |
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| 288 | * @return string[] |
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| 289 | */ |
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| 290 | 2 | final public static function getNames() |
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| 291 | { |
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| 292 | 2 | if (!isset(self::$names[static::class])) { |
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| 293 | 1 | self::detectConstants(static::class); |
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| 294 | } |
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| 295 | 2 | return self::$names[static::class]; |
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| 296 | } |
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| 297 | /* |
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| 298 | * Get a list of enumerator ordinal numbers |
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| 299 | * |
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| 300 | * @return int[] |
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| 301 | */ |
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| 302 | 1 | final public static function getOrdinals() |
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| 303 | { |
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| 304 | 1 | $count = \count(self::detectConstants(static::class)); |
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| 305 | 1 | return $count === 0 ? [] : \range(0, $count - 1); |
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| 306 | } |
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| 307 | |||
| 308 | /** |
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| 309 | * Get all available constants of the called class |
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| 310 | * |
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| 311 | * @return array |
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| 312 | * @throws LogicException On ambiguous constant values |
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| 313 | */ |
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| 314 | 78 | final public static function getConstants() |
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| 315 | { |
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| 316 | 78 | return self::detectConstants(static::class); |
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| 317 | } |
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| 318 | |||
| 319 | /** |
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| 320 | * Is the given enumerator part of this enumeration |
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| 321 | * |
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| 322 | * @param static|null|bool|int|float|string $value |
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| 323 | * @return bool |
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| 324 | */ |
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| 325 | 1 | final public static function has($value) |
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| 326 | { |
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| 327 | 1 | if ($value instanceof static && \get_class($value) === static::class) { |
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| 328 | 1 | return true; |
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| 329 | } |
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| 330 | |||
| 331 | 1 | $constants = self::detectConstants(static::class); |
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| 332 | 1 | return \in_array($value, $constants, true); |
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| 333 | } |
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| 334 | |||
| 335 | /** |
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| 336 | * Detect all public available constants of given enumeration class |
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| 337 | * |
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| 338 | * @param string $class |
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| 339 | * @return array |
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| 340 | * @throws LogicException On ambiguous constant values |
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| 341 | */ |
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| 342 | 102 | private static function detectConstants($class) |
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| 343 | { |
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| 344 | 102 | if (!isset(self::$constants[$class])) { |
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| 345 | 35 | $reflection = new ReflectionClass($class); |
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| 346 | 35 | $constants = []; |
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| 347 | |||
| 348 | do { |
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| 349 | 35 | $scopeConstants = []; |
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| 350 | 35 | if (PHP_VERSION_ID >= 70100) { |
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| 351 | // Since PHP-7.1 visibility modifiers are allowed for class constants |
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| 352 | // for enumerations we are only interested in public once. |
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| 353 | foreach ($reflection->getReflectionConstants() as $reflConstant) { |
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| 354 | if ($reflConstant->isPublic()) { |
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| 355 | $scopeConstants[ $reflConstant->getName() ] = $reflConstant->getValue(); |
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| 356 | } |
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| 357 | } |
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| 358 | } else { |
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| 359 | // In PHP < 7.1 all class constants were public by definition |
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| 360 | 35 | $scopeConstants = $reflection->getConstants(); |
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| 361 | } |
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| 362 | |||
| 363 | 35 | $constants = $scopeConstants + $constants; |
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| 364 | 35 | } while (($reflection = $reflection->getParentClass()) && $reflection->name !== __CLASS__); |
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| 365 | |||
| 366 | // Detect ambiguous values and report names |
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| 367 | 35 | $ambiguous = []; |
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| 368 | 35 | foreach ($constants as $value) { |
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| 369 | 34 | $names = \array_keys($constants, $value, true); |
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| 370 | 34 | if (\count($names) > 1) { |
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| 371 | 34 | $ambiguous[\var_export($value, true)] = $names; |
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| 372 | } |
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| 373 | } |
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| 374 | 35 | if (!empty($ambiguous)) { |
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| 375 | 2 | throw new LogicException( |
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| 376 | 'All possible values needs to be unique. The following are ambiguous: ' |
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| 377 | 2 | . \implode(', ', \array_map(function ($names) use ($constants) { |
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| 378 | 2 | return \implode('/', $names) . '=' . \var_export($constants[$names[0]], true); |
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| 379 | 2 | }, $ambiguous)) |
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| 380 | ); |
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| 381 | } |
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| 382 | |||
| 383 | 33 | self::$constants[$class] = $constants; |
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| 384 | 33 | self::$names[$class] = \array_keys($constants); |
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| 385 | } |
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| 386 | |||
| 387 | 100 | return self::$constants[$class]; |
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| 388 | } |
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| 389 | |||
| 390 | /** |
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| 391 | * Get an enumerator instance by the given name. |
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| 392 | * |
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| 393 | * This will be called automatically on calling a method |
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| 394 | * with the same name of a defined enumerator. |
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| 395 | * |
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| 396 | * @param string $method The name of the enumeraotr (called as method) |
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| 397 | * @param array $args There should be no arguments |
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| 398 | * @return static |
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| 399 | * @throws InvalidArgumentException On an invalid or unknown name |
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| 400 | * @throws LogicException On ambiguous constant values |
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| 401 | */ |
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| 402 | 26 | final public static function __callStatic($method, array $args) |
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| 405 | } |
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| 406 | } |
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| 407 |
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