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<?php |
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namespace Paillechat\Enum; |
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use Paillechat\Enum\Exception\EnumException; |
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abstract class Enum |
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{ |
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/** @var string */ |
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private static $defaultConstantName = '__default'; |
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/** @var \ReflectionClass[] */ |
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private static $reflections; |
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/** @var mixed */ |
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protected $value; |
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/** |
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* @param mixed $value |
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* |
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* @throws EnumException |
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*/ |
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final public function __construct($value = null) |
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{ |
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if ($value === null) { |
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$value = static::getDefaultValue(); |
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} |
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$this->assertValue($value); |
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$this->value = $value; |
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} |
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/** |
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* @param bool $includeDefault |
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* |
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* @return array |
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*/ |
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final public static function getConstList(bool $includeDefault = false): array |
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{ |
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self::$reflections[static::class] = |
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self::$reflections[static::class] ?? |
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new \ReflectionClass(static::class); |
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return array_filter( |
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self::$reflections[static::class]->getConstants(), |
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function ($key) use ($includeDefault) { |
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if ($includeDefault === false && $key === self::$defaultConstantName) { |
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return false; |
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} |
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return true; |
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}, |
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ARRAY_FILTER_USE_KEY |
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); |
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} |
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/** |
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* Creates enum instance with short static constructor |
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* |
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* @param string $name |
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* @param array $arguments |
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* |
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* @return static |
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* |
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* @throws \BadMethodCallException |
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*/ |
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final public static function __callStatic(string $name, array $arguments) |
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{ |
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$const = static::getConstList(); |
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if (!array_key_exists($name, $const)) { |
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throw new \BadMethodCallException(sprintf('Unknown static constructor "%s" for %s', $name, static::class)); |
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} |
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return new static($const[$name]); |
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} |
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/** |
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* @return mixed |
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* |
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* @throws EnumException |
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*/ |
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protected static function getDefaultValue() |
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{ |
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$const = static::getConstList(true); |
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if (!array_key_exists(self::$defaultConstantName, $const)) { |
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throw EnumException::becauseNoDefaultValue(static::class); |
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} |
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return $const[self::$defaultConstantName]; |
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} |
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/** |
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* @return mixed |
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*/ |
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final public function getValue() |
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{ |
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return $this->value; |
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} |
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/** |
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* Compares one Enum with another. |
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* |
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* @param Enum $enum |
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* |
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* @return bool True if Enums are equal, false if not equal |
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*/ |
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final public function equals(Enum $enum) |
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{ |
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return $this->getValue() === $enum->getValue() && static::class === get_class($enum); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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1 |
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public function __toString(): string |
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{ |
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return (string) $this->getValue(); |
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} |
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/** |
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* @param mixed $value |
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* |
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* @throws EnumException |
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*/ |
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6 |
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private function assertValue($value) |
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{ |
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6 |
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$const = static::getConstList(true); |
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$defaultValueUsed = $value === null && isset($const[self::$defaultConstantName]); |
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if (!$defaultValueUsed && !in_array($value, $const, true)) { |
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1 |
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throw EnumException::becauseUnrecognisedValue(static::class, $value); |
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} |
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5 |
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} |
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} |
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paillechat /
php-enum
