Enum.php
205 lines
| 1 | <?php |
| 2 | /** |
| 3 | * @link http://github.com/myclabs/php-enum |
| 4 | * @license http://www.opensource.org/licenses/mit-license.php MIT (see the LICENSE file) |
| 5 | */ |
| 6 | |
| 7 | namespace MyCLabs\Enum; |
| 8 | |
| 9 | /** |
| 10 | * Base Enum class |
| 11 | * |
| 12 | * Create an enum by implementing this class and adding class constants. |
| 13 | * |
| 14 | * @author Matthieu Napoli <matthieu@mnapoli.fr> |
| 15 | * @author Daniel Costa <danielcosta@gmail.com> |
| 16 | * @author Mirosław Filip <mirfilip@gmail.com> |
| 17 | */ |
| 18 | abstract class Enum implements \JsonSerializable |
| 19 | { |
| 20 | /** |
| 21 | * Enum value |
| 22 | * |
| 23 | * @var mixed |
| 24 | */ |
| 25 | protected $value; |
| 26 | |
| 27 | /** |
| 28 | * Store existing constants in a static cache per object. |
| 29 | * |
| 30 | * @var array |
| 31 | */ |
| 32 | protected static $cache = []; |
| 33 | |
| 34 | /** |
| 35 | * Creates a new value of some type |
| 36 | * |
| 37 | * @param mixed $value |
| 38 | * |
| 39 | * @throws \UnexpectedValueException if incompatible type is given. |
| 40 | */ |
| 41 | public function __construct($value) |
| 42 | { |
| 43 | if ($value instanceof static) { |
| 44 | $this->value = $value->getValue(); |
| 45 | |
| 46 | return; |
| 47 | } |
| 48 | |
| 49 | if (!$this->isValid($value)) { |
| 50 | throw new \UnexpectedValueException("Value '$value' is not part of the enum " . \get_called_class()); |
| 51 | } |
| 52 | |
| 53 | $this->value = $value; |
| 54 | } |
| 55 | |
| 56 | /** |
| 57 | * @return mixed |
| 58 | */ |
| 59 | public function getValue() |
| 60 | { |
| 61 | return $this->value; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Returns the enum key (i.e. the constant name). |
| 66 | * |
| 67 | * @return mixed |
| 68 | */ |
| 69 | public function getKey() |
| 70 | { |
| 71 | return static::search($this->value); |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * @return string |
| 76 | */ |
| 77 | public function __toString() |
| 78 | { |
| 79 | return (string)$this->value; |
| 80 | } |
| 81 | |
| 82 | /** |
| 83 | * Compares one Enum with another. |
| 84 | * |
| 85 | * This method is final, for more information read https://github.com/myclabs/php-enum/issues/4 |
| 86 | * |
| 87 | * @return bool True if Enums are equal, false if not equal |
| 88 | */ |
| 89 | final public function equals(Enum $enum = null) |
| 90 | { |
| 91 | return $enum !== null && $this->getValue() === $enum->getValue() && \get_called_class() === \get_class($enum); |
| 92 | } |
| 93 | |
| 94 | /** |
| 95 | * Returns the names (keys) of all constants in the Enum class |
| 96 | * |
| 97 | * @return array |
| 98 | */ |
| 99 | public static function keys() |
| 100 | { |
| 101 | return \array_keys(static::toArray()); |
| 102 | } |
| 103 | |
| 104 | /** |
| 105 | * Returns instances of the Enum class of all Enum constants |
| 106 | * |
| 107 | * @return static[] Constant name in key, Enum instance in value |
| 108 | */ |
| 109 | public static function values() |
| 110 | { |
| 111 | $values = array(); |
| 112 | |
| 113 | foreach (static::toArray() as $key => $value) { |
| 114 | $values[$key] = new static($value); |
| 115 | } |
| 116 | |
| 117 | return $values; |
| 118 | } |
| 119 | |
| 120 | /** |
| 121 | * Returns all possible values as an array |
| 122 | * |
| 123 | * @return array Constant name in key, constant value in value |
| 124 | */ |
| 125 | public static function toArray() |
| 126 | { |
| 127 | $class = \get_called_class(); |
| 128 | if (!isset(static::$cache[$class])) { |
| 129 | $reflection = new \ReflectionClass($class); |
| 130 | static::$cache[$class] = $reflection->getConstants(); |
| 131 | } |
| 132 | |
| 133 | return static::$cache[$class]; |
| 134 | } |
| 135 | |
| 136 | /** |
| 137 | * Check if is valid enum value |
| 138 | * |
| 139 | * @param $value |
| 140 | * |
| 141 | * @return bool |
| 142 | */ |
| 143 | public static function isValid($value) |
| 144 | { |
| 145 | return \in_array($value, static::toArray(), true); |
| 146 | } |
| 147 | |
| 148 | /** |
| 149 | * Check if is valid enum key |
| 150 | * |
| 151 | * @param $key |
| 152 | * |
| 153 | * @return bool |
| 154 | */ |
| 155 | public static function isValidKey($key) |
| 156 | { |
| 157 | $array = static::toArray(); |
| 158 | |
| 159 | return isset($array[$key]) || \array_key_exists($key, $array); |
| 160 | } |
| 161 | |
| 162 | /** |
| 163 | * Return key for value |
| 164 | * |
| 165 | * @param $value |
| 166 | * |
| 167 | * @return mixed |
| 168 | */ |
| 169 | public static function search($value) |
| 170 | { |
| 171 | return \array_search($value, static::toArray(), true); |
| 172 | } |
| 173 | |
| 174 | /** |
| 175 | * Returns a value when called statically like so: MyEnum::SOME_VALUE() given SOME_VALUE is a class constant |
| 176 | * |
| 177 | * @param string $name |
| 178 | * @param array $arguments |
| 179 | * |
| 180 | * @return static |
| 181 | * @throws \BadMethodCallException |
| 182 | */ |
| 183 | public static function __callStatic($name, $arguments) |
| 184 | { |
| 185 | $array = static::toArray(); |
| 186 | if (isset($array[$name]) || \array_key_exists($name, $array)) { |
| 187 | return new static($array[$name]); |
| 188 | } |
| 189 | |
| 190 | throw new \BadMethodCallException("No static method or enum constant '$name' in class " . \get_called_class()); |
| 191 | } |
| 192 | |
| 193 | /** |
| 194 | * Specify data which should be serialized to JSON. This method returns data that can be serialized by json_encode() |
| 195 | * natively. |
| 196 | * |
| 197 | * @return mixed |
| 198 | * @link http://php.net/manual/en/jsonserializable.jsonserialize.php |
| 199 | */ |
| 200 | public function jsonSerialize() |
| 201 | { |
| 202 | return $this->getValue(); |
| 203 | } |
| 204 | } |
| 205 |