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<?php |
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/* |
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* Copyright (c) Nate Brunette. |
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* Distributed under the MIT License (http://opensource.org/licenses/MIT) |
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*/ |
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namespace Tebru\Enum; |
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use BadMethodCallException; |
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use RuntimeException; |
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/**v |
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* Class AbstractEnum |
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* |
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* @author Nate Brunette <[email protected]> |
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*/ |
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abstract class AbstractEnum implements EnumInterface |
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{ |
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/** |
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* @var string |
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*/ |
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private $value; |
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/** |
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* An array of created instances to ensure singleton |
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* |
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* @var array |
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*/ |
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private static $instances = []; |
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/** |
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* Constructor |
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* |
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* @param string $value |
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* @throws RuntimeException If the value is not valid |
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*/ |
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final private function __construct($value) |
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{ |
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if (!static::exists($value)) { |
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throw new RuntimeException(sprintf('%s is not a valid value for this enum.', $value)); |
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} |
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$this->value = $value; |
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} |
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/** |
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* Return the value as a string |
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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 (string) $this->value; |
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} |
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/** |
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* Do a comparison to check if the enum values are equal |
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* |
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* @param EnumInterface $enum |
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* @return bool |
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*/ |
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public function equals(EnumInterface $enum) |
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{ |
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return $this->getValue() === $enum->getValue(); |
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} |
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/** |
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* Create a new instance of the enum |
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* |
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* @param string $value |
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* @return AbstractEnum |
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* @throws RuntimeException If the value is not valid |
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*/ |
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public static function create($value) |
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{ |
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if (array_key_exists($value, self::$instances)) { |
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return self::$instances[$value]; |
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} |
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$instance = new static($value); |
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self::$instances[$value] = $instance; |
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return $instance; |
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} |
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/** |
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* Return true if the value is valid for the enum |
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* |
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* @param string $value |
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* @return bool |
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*/ |
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public static function exists($value) |
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{ |
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return in_array($value, static::values(), true); |
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} |
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/** |
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* Get an array of the enum values |
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* |
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* @return array |
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*/ |
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public static function values() |
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{ |
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return array_values(static::getConstants()); |
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} |
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/** |
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* Return enum as an array with keys matching values |
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* |
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* @return array |
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*/ |
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public static function toArray() |
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{ |
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return array_combine(self::values(), self::values()); |
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} |
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/** |
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* Get the current enum value |
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* |
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* @return mixed |
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*/ |
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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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* Allow enum instantiation by magic method |
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* |
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* @param string $name |
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* @param $arguments |
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* @return static |
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* @throws RuntimeException If the value is not valid |
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* @throws BadMethodCallException If the constant doesn't exist in the class |
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*/ |
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public static function __callStatic($name, $arguments) |
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{ |
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$constant = @constant('static::' . $name); |
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if (null === $constant) { |
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throw new BadMethodCallException(sprintf('Could not find constant "%s" for class "%s"', $name, static::class)); |
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} |
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return self::create($constant); |
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} |
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} |
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tebru /
enum
