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<?php |
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/** |
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* GpsLab component. |
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* |
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* @author Peter Gribanov <[email protected]> |
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* @copyright Copyright (c) 2017, Peter Gribanov |
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* @license http://opensource.org/licenses/MIT |
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*/ |
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namespace GpsLab\Component\Enum; |
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use GpsLab\Component\Enum\Exception\OutOfEnumException; |
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abstract class ExplicitEnum implements Enum, \Serializable |
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{ |
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/** |
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* @var mixed |
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*/ |
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private $value; |
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/** |
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* @var self[] |
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*/ |
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private static $instances = []; |
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/** |
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* @param mixed $value |
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*/ |
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final private function __construct($value) |
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{ |
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$this->value = $value; |
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} |
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/** |
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* @param mixed $value |
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* |
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* @return self |
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*/ |
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final public static function byValue($value) |
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{ |
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$key = get_called_class().'|'.$value; |
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// limitation of count object instances |
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if (!isset(self::$instances[$key])) { |
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if (!array_key_exists($value, static::choices())) { |
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throw OutOfEnumException::invalidValue($value, get_called_class()); |
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} |
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self::$instances[$key] = new static($value); |
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} |
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return self::$instances[$key]; |
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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 value() |
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{ |
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return $this->value; |
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} |
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/** |
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* Available values. |
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* |
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* @return self[] |
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*/ |
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final public static function values() |
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{ |
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$values = []; |
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foreach (static::choices() as $value => $label) { |
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$values[$label] = self::byValue($value); |
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} |
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return $values; |
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} |
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/** |
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* @param Enum $enum |
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* |
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* @return bool |
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*/ |
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final public function equals(Enum $enum) |
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{ |
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return $this === $enum || ($this->value() === $enum->value() && get_called_class() === get_class($enum)); |
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} |
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/** |
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* Return readable value. |
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* |
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* @return string |
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*/ |
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public function __toString() |
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{ |
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return static::choices()[$this->value()]; |
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} |
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final public function __clone() |
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{ |
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throw new \LogicException('Enumerations are not cloneable'); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function serialize() |
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{ |
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return serialize($this->value); |
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} |
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/** |
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* @param mixed $data |
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*/ |
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public function unserialize($data) |
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{ |
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static::byValue($this->value = unserialize($data)); |
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} |
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} |
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gpslab /
enum
