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<?php |
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namespace SpareParts\Enum; |
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use SpareParts\Enum\Exception\InvalidEnumSetupException; |
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use SpareParts\Enum\Exception\InvalidEnumValueException; |
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use SpareParts\Enum\Exception\OperationNotAllowedException; |
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/** |
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* |
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*/ |
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abstract class Enum |
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{ |
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/** |
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* @var string[] |
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*/ |
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protected static $values = []; |
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/** |
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* @var $this[] |
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*/ |
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protected static $instances = []; |
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/** |
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* @var string |
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*/ |
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protected $value; |
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/** |
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* PROTECTED!! Not callable directly. |
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* @see static::instance() |
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* @see static::__callStatic() |
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* @internal |
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* |
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* @param string $value |
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*/ |
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protected function __construct($value) |
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{ |
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if (empty(static::$values)) { |
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throw new InvalidEnumSetupException('Incorrect setup! Enum '.get_called_class().' doesn\'t have its static::$values set.'); |
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} |
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if (!in_array($value, static::$values)) { |
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throw new InvalidEnumValueException('Enum '.get_called_class().'does not contain value '.$value.'. Possible values are: '.implode(', ', static::$values)); |
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} |
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$this->value = $value; |
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} |
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/** |
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* String representation |
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*/ |
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public function __toString() |
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{ |
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return $this->value; |
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} |
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/** |
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* @param string $method |
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* @param array $args |
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* |
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* @return \SpareParts\Enum\Enum |
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*/ |
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public static function __callStatic($method, $args) |
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{ |
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return static::instance($method); |
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} |
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/** |
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* @param string $value |
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* |
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* @return $this |
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*/ |
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public static function instance($value) |
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{ |
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if (!isset(static::$instances[get_called_class()][$value])) { |
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static::$instances[get_called_class()][$value] = new static($value); |
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} |
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return static::$instances[get_called_class()][$value]; |
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} |
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public function __clone() |
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{ |
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throw new OperationNotAllowedException('Singleton cannot be cloned.'); |
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} |
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public function __sleep() |
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{ |
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throw new OperationNotAllowedException('Singleton cannot be serialized.'); |
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} |
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public function __wakeup() |
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{ |
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throw new OperationNotAllowedException('Singleton cannot be serialized'); |
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} |
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} |
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SpareParts /
Enum
