marc-mabe /
php-enum
| Total Complexity | 55 |
| Total Lines | 408 |
| Duplicated Lines | 0 % |
| 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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| 18 | abstract class Enum |
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| 19 | { |
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| 20 | /** |
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| 21 | * The selected enumerator value |
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| 22 | * |
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| 23 | * @var null|bool|int|float|string|array |
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| 24 | */ |
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| 25 | private $value; |
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| 26 | |||
| 27 | /** |
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| 28 | * The ordinal number of the enumerator |
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| 29 | * |
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| 30 | * @var null|int |
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| 31 | */ |
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| 32 | private $ordinal; |
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| 33 | |||
| 34 | /** |
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| 35 | * A map of enumerator names and values by enumeration class |
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| 36 | * |
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| 37 | * @var array ["$class" => ["$name" => $value, ...], ...] |
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| 38 | */ |
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| 39 | private static $constants = []; |
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| 40 | |||
| 41 | /** |
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| 42 | * A List of available enumerator names by enumeration class |
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| 43 | * |
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| 44 | * @var array ["$class" => ["$name0", ...], ...] |
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| 45 | */ |
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| 46 | private static $names = []; |
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| 47 | |||
| 48 | /** |
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| 49 | * Already instantiated enumerators |
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| 50 | * |
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| 51 | * @var array ["$class" => ["$name" => $instance, ...], ...] |
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| 52 | */ |
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| 53 | private static $instances = []; |
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| 54 | |||
| 55 | /** |
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| 56 | * Constructor |
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| 57 | * |
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| 58 | * @param null|bool|int|float|string|array $value The value of the enumerator |
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| 59 | * @param int|null $ordinal The ordinal number of the enumerator |
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| 60 | */ |
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| 61 | final private function __construct($value, int $ordinal = null) |
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| 62 | { |
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| 63 | $this->value = $value; |
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| 64 | $this->ordinal = $ordinal; |
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| 65 | } |
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| 66 | |||
| 67 | /** |
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| 68 | * Get the name of the enumerator |
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| 69 | * |
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| 70 | * @return string |
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| 71 | * @see getName() |
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| 72 | */ |
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| 73 | public function __toString(): string |
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| 74 | { |
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| 75 | return $this->getName(); |
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| 76 | } |
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| 77 | |||
| 78 | /** |
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| 79 | * @throws LogicException Enums are not cloneable |
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| 80 | * because instances are implemented as singletons |
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| 81 | */ |
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| 82 | final private function __clone() |
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| 83 | { |
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| 84 | throw new LogicException('Enums are not cloneable'); |
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| 85 | } |
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| 86 | |||
| 87 | /** |
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| 88 | * @throws LogicException Enums are not serializable |
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| 89 | * because instances are implemented as singletons |
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| 90 | */ |
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| 91 | final public function __sleep() |
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| 92 | { |
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| 93 | throw new LogicException('Enums are not serializable'); |
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| 94 | } |
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| 95 | |||
| 96 | /** |
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| 97 | * @throws LogicException Enums are not serializable |
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| 98 | * because instances are implemented as singletons |
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| 99 | */ |
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| 100 | final public function __wakeup() |
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| 101 | { |
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| 102 | throw new LogicException('Enums are not serializable'); |
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| 103 | } |
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| 104 | |||
| 105 | /** |
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| 106 | * Get the value of the enumerator |
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| 107 | * |
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| 108 | * @return null|bool|int|float|string|array |
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| 109 | */ |
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| 110 | final public function getValue() |
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| 111 | { |
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| 112 | return $this->value; |
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| 113 | } |
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| 114 | |||
| 115 | /** |
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| 116 | * Get the name of the enumerator |
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| 117 | * |
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| 118 | * @return string |
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| 119 | */ |
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| 120 | final public function getName(): string |
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| 121 | { |
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| 122 | return self::$names[static::class][$this->ordinal ?: $this->getOrdinal()]; |
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| 123 | } |
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| 124 | |||
| 125 | /** |
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| 126 | * Get the ordinal number of the enumerator |
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| 127 | * |
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| 128 | * @return int |
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| 129 | */ |
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| 130 | final public function getOrdinal(): int |
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| 131 | { |
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| 132 | if ($this->ordinal === null) { |
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| 133 | $ordinal = 0; |
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| 134 | $value = $this->value; |
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| 135 | foreach (self::detectConstants(static::class) as $constValue) { |
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| 136 | if ($value === $constValue) { |
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| 137 | break; |
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| 138 | } |
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| 139 | ++$ordinal; |
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| 140 | } |
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| 141 | |||
| 142 | $this->ordinal = $ordinal; |
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| 143 | } |
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| 144 | |||
| 145 | return $this->ordinal; |
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| 146 | } |
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| 147 | |||
| 148 | /** |
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| 149 | * Compare this enumerator against another and check if it's the same. |
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| 150 | * |
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| 151 | * @param static|null|bool|int|float|string|array $enumerator An enumerator object or value |
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| 152 | * @return bool |
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| 153 | */ |
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| 154 | final public function is($enumerator): bool |
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| 155 | { |
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| 156 | return $this === $enumerator || $this->value === $enumerator |
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| 157 | |||
| 158 | // The following additional conditions are required only because of the issue of serializable singletons |
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| 159 | || ($enumerator instanceof static |
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| 160 | && \get_class($enumerator) === static::class |
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| 161 | && $enumerator->value === $this->value |
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| 162 | ); |
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| 163 | } |
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| 164 | |||
| 165 | /** |
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| 166 | * Get an enumerator instance of the given enumerator value or instance |
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| 167 | * |
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| 168 | * @param static|null|bool|int|float|string|array $enumerator An enumerator object or value |
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| 169 | * @return static |
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| 170 | * @throws InvalidArgumentException On an unknwon or invalid value |
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| 171 | * @throws LogicException On ambiguous constant values |
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| 172 | */ |
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| 173 | final public static function get($enumerator): self |
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| 174 | { |
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| 175 | if ($enumerator instanceof static && \get_class($enumerator) === static::class) { |
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| 176 | return $enumerator; |
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| 177 | } |
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| 178 | |||
| 179 | return static::byValue($enumerator); |
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| 180 | } |
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| 181 | |||
| 182 | /** |
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| 183 | * Get an enumerator instance by the given value |
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| 184 | * |
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| 185 | * @param mixed $value The value of the enumerator |
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| 186 | * @return static |
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| 187 | * @throws InvalidArgumentException On an unknwon or invalid value |
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| 188 | * @throws LogicException On ambiguous constant values |
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| 189 | */ |
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| 190 | final public static function byValue($value): self |
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| 191 | { |
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| 192 | if (!isset(self::$constants[static::class])) { |
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| 193 | self::detectConstants(static::class); |
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| 194 | } |
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| 195 | |||
| 196 | $name = \array_search($value, self::$constants[static::class], true); |
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| 197 | if ($name === false) { |
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| 198 | throw new InvalidArgumentException(sprintf( |
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| 199 | 'Unknown value %s for enumeration %s', |
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| 200 | \is_scalar($value) |
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| 201 | ? \var_export($value, true) |
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| 202 | : 'of type ' . (\is_object($value) ? \get_class($value) : \gettype($value)), |
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| 203 | static::class |
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| 204 | )); |
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| 205 | } |
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| 206 | |||
| 207 | if (!isset(self::$instances[static::class][$name])) { |
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| 208 | self::$instances[static::class][$name] = new static(self::$constants[static::class][$name]); |
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| 209 | } |
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| 210 | |||
| 211 | return self::$instances[static::class][$name]; |
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| 212 | } |
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| 213 | |||
| 214 | /** |
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| 215 | * Get an enumerator instance by the given name |
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| 216 | * |
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| 217 | * @param string $name The name of the enumerator |
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| 218 | * @return static |
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| 219 | * @throws InvalidArgumentException On an invalid or unknown name |
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| 220 | * @throws LogicException On ambiguous values |
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| 221 | */ |
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| 222 | final public static function byName(string $name): self |
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| 223 | { |
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| 224 | if (isset(self::$instances[static::class][$name])) { |
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| 225 | return self::$instances[static::class][$name]; |
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| 226 | } |
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| 227 | |||
| 228 | $const = static::class . "::{$name}"; |
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| 229 | if (!\defined($const)) { |
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| 230 | throw new InvalidArgumentException("{$const} not defined"); |
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| 231 | } |
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| 232 | |||
| 233 | return self::$instances[static::class][$name] = new static(\constant($const)); |
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| 234 | } |
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| 235 | |||
| 236 | /** |
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| 237 | * Get an enumeration instance by the given ordinal number |
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| 238 | * |
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| 239 | * @param int $ordinal The ordinal number of the enumerator |
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| 240 | * @return static |
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| 241 | * @throws InvalidArgumentException On an invalid ordinal number |
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| 242 | * @throws LogicException On ambiguous values |
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| 243 | */ |
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| 244 | final public static function byOrdinal(int $ordinal): self |
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| 245 | { |
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| 246 | if (!isset(self::$names[static::class])) { |
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| 247 | self::detectConstants(static::class); |
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| 248 | } |
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| 249 | |||
| 250 | if (!isset(self::$names[static::class][$ordinal])) { |
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| 251 | throw new InvalidArgumentException(\sprintf( |
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| 252 | 'Invalid ordinal number, must between 0 and %s', |
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| 253 | \count(self::$names[static::class]) - 1 |
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| 254 | )); |
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| 255 | } |
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| 256 | |||
| 257 | $name = self::$names[static::class][$ordinal]; |
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| 258 | if (isset(self::$instances[static::class][$name])) { |
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| 259 | return self::$instances[static::class][$name]; |
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| 260 | } |
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| 261 | |||
| 262 | return self::$instances[static::class][$name] = new static(self::$constants[static::class][$name], $ordinal); |
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| 263 | } |
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| 264 | |||
| 265 | /** |
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| 266 | * Get a list of enumerator instances ordered by ordinal number |
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| 267 | * |
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| 268 | * @return static[] |
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| 269 | */ |
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| 270 | final public static function getEnumerators(): array |
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| 271 | { |
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| 272 | if (!isset(self::$names[static::class])) { |
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| 273 | self::detectConstants(static::class); |
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| 274 | } |
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| 275 | return \array_map([static::class, 'byName'], self::$names[static::class]); |
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| 276 | } |
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| 277 | |||
| 278 | /** |
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| 279 | * Get a list of enumerator values ordered by ordinal number |
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| 280 | * |
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| 281 | * @return mixed[] |
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| 282 | */ |
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| 283 | final public static function getValues(): array |
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| 284 | { |
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| 285 | return \array_values(self::detectConstants(static::class)); |
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| 286 | } |
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| 287 | |||
| 288 | /** |
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| 289 | * Get a list of enumerator names ordered by ordinal number |
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| 290 | * |
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| 291 | * @return string[] |
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| 292 | */ |
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| 293 | final public static function getNames(): array |
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| 294 | { |
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| 295 | if (!isset(self::$names[static::class])) { |
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| 296 | self::detectConstants(static::class); |
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| 297 | } |
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| 298 | return self::$names[static::class]; |
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| 299 | } |
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| 300 | |||
| 301 | /** |
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| 302 | * Get a list of enumerator ordinal numbers |
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| 303 | * |
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| 304 | * @return int[] |
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| 305 | */ |
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| 306 | final public static function getOrdinals(): array |
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| 307 | { |
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| 308 | $count = \count(self::detectConstants(static::class)); |
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| 309 | return $count ? \range(0, $count - 1) : []; |
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| 310 | } |
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| 311 | |||
| 312 | /** |
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| 313 | * Get all available constants of the called class |
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| 314 | * |
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| 315 | * @return array |
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| 316 | * @throws LogicException On ambiguous constant values |
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| 317 | */ |
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| 318 | final public static function getConstants(): array |
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| 319 | { |
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| 320 | return self::detectConstants(static::class); |
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| 321 | } |
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| 322 | |||
| 323 | /** |
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| 324 | * Test if the given enumerator is part of this enumeration |
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| 325 | * |
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| 326 | * @param static|null|bool|int|float|string|array $enumerator |
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| 327 | * @return bool |
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| 328 | */ |
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| 329 | final public static function has($enumerator): bool |
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| 330 | { |
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| 331 | return ($enumerator instanceof static && \get_class($enumerator) === static::class) |
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| 332 | || static::hasValue($enumerator); |
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| 333 | } |
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| 334 | |||
| 335 | /** |
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| 336 | * Test if the given enumerator value is part of this enumeration |
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| 337 | * |
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| 338 | * @param null|bool|int|float|string|array $value |
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| 339 | * @return bool |
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| 340 | */ |
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| 341 | final public static function hasValue($value): bool |
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| 342 | { |
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| 343 | $constants = self::detectConstants(static::class); |
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| 344 | return \in_array($value, $constants, true); |
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| 345 | } |
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| 346 | |||
| 347 | /** |
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| 348 | * Test if the given enumerator name is part of this enumeration |
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| 349 | * |
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| 350 | * @param string $name |
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| 351 | * @return bool |
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| 352 | */ |
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| 353 | final public static function hasName(string $name): bool |
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| 356 | } |
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| 357 | |||
| 358 | /** |
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| 359 | * Detect all public available constants of given enumeration class |
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| 360 | * |
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| 361 | * @param string $class |
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| 362 | * @return array |
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| 363 | */ |
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| 364 | private static function detectConstants(string $class): array |
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| 365 | { |
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| 366 | if (!isset(self::$constants[$class])) { |
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| 367 | $reflection = new ReflectionClass($class); |
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| 392 | } |
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| 393 | |||
| 394 | /** |
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| 395 | * Test that the given constants does not contain ambiguous values |
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| 396 | * @param array $constants |
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| 397 | * @return bool |
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| 398 | */ |
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| 399 | private static function noAmbiguousValues(array $constants): bool |
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| 400 | { |
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| 401 | foreach ($constants as $value) { |
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| 402 | $names = \array_keys($constants, $value, true); |
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| 403 | if (\count($names) > 1) { |
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| 404 | return false; |
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| 405 | } |
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| 406 | } |
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| 407 | |||
| 408 | return true; |
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| 409 | } |
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| 410 | |||
| 411 | /** |
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| 412 | * Get an enumerator instance by the given name. |
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| 413 | * |
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| 414 | * This will be called automatically on calling a method |
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| 415 | * with the same name of a defined enumerator. |
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| 416 | * |
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| 417 | * @param string $method The name of the enumerator (called as method) |
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| 418 | * @param array $args There should be no arguments |
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| 419 | * @return static |
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| 420 | * @throws InvalidArgumentException On an invalid or unknown name |
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| 421 | * @throws LogicException On ambiguous constant values |
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| 422 | */ |
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| 423 | final public static function __callStatic(string $method, array $args): self |
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| 426 | } |
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| 427 | } |
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| 428 |
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