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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) 2011, 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 ReflectionEnum 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 Enum[] |
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*/ |
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private static $instances = []; |
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/** |
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* @var array |
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*/ |
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private static $constants = []; |
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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 $value |
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* |
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* @return Enum |
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*/ |
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final public static function byValue($value) |
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{ |
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$class = get_called_class(); |
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self::constants(); |
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$constant = array_search($value, self::$constants[$class], true); |
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if ($constant === false) { |
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throw OutOfEnumException::invalidValue($value, $class); |
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} |
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// limitation of count object instances |
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if (!isset(self::$instances[$class][$constant])) { |
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self::$instances[$class][$constant] = new static($value); |
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} |
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return self::$instances[$class][$constant]; |
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} |
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/** |
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* @param string $name |
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* |
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* @return Enum |
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*/ |
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final public static function byName($name) |
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{ |
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$class = get_called_class(); |
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if (isset(self::$instances[$class][$name])) { |
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return self::$instances[$class][$name]; |
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} |
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self::constants(); |
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if (!isset(self::$constants[$class][$name])) { |
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throw OutOfEnumException::undefinedConstant($class . '::' . $name); |
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} |
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return self::$instances[$class][$name] = new static(self::$constants[$class][$name]); |
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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 $this->value; |
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} |
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/** |
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* Available values. |
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* |
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* @return Enum[] |
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*/ |
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final public static function values() |
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{ |
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$values = []; |
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foreach (self::constants() as $constant => $value) { |
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$values[$constant] = self::byValue($value); |
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} |
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return $values; |
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} |
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/** |
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* @return string |
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*/ |
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final public function name() |
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{ |
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return array_search($this->value(), self::constants()); |
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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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* Get choices for radio group. |
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* |
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* <code> |
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* { |
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* value1: 'Readable value 1', |
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* value2: 'Readable value 2', |
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* } |
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* </code> |
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* |
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* @return array |
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*/ |
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final public static function choices() |
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{ |
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$choices = []; |
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foreach (self::constants() as $value) { |
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$choices[$value] = (string) self::byValue($value); |
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} |
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return $choices; |
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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 $this->name(); |
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} |
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final public function __clone() |
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{ |
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throw new \LogicException('Enumerations are not cloneable'); |
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} |
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/** |
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* @return mixed |
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*/ |
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public function serialize() |
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{ |
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return serialize($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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self::byValue($this->value = unserialize($data)); |
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} |
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/** |
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* @return array |
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*/ |
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private static function constants() |
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{ |
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$class = get_called_class(); |
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if (!isset(self::$constants[$class])) { |
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self::$constants[$class] = ConstantDetector::detect($class); |
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} |
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return self::$constants[$class]; |
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} |
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/** |
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* @param string $method |
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* @param array $arguments |
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* |
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* @return Enum |
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*/ |
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public static function __callStatic($method, array $arguments = []) |
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{ |
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return self::byName($method); |
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} |
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} |
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