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<?php |
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/* |
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* This file is part of the "elao/enum" package. |
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* |
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* Copyright (C) Elao |
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* |
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* @author Elao <[email protected]> |
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*/ |
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namespace Elao\Enum; |
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use Elao\Enum\Exception\InvalidValueException; |
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use Elao\Enum\Exception\LogicException; |
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trait EnumTrait |
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{ |
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/** |
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* Cached array of enum instances by enum type (FQCN). |
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* This cache is used in order to make single enums values act as singletons. |
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* This means you'll always get the exact same instance for a same enum value. |
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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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/** @var mixed */ |
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protected $value; |
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/** |
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* The constructor is private and cannot be overridden: use the static get method instead. |
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* |
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* @param mixed $value The raw value of an enumeration |
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*/ |
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final private function __construct($value) |
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{ |
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$this->value = $value; |
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$enumType = static::class; |
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$identifier = serialize($value); |
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if (isset(self::$instances[$enumType][$identifier])) { |
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throw new LogicException( |
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'"__construct" should not be called when an instance already exists for this enum value.' |
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); |
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} |
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if (!isset(self::$instances[$enumType])) { |
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self::$instances[$enumType] = []; |
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} |
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self::$instances[$enumType][$identifier] = $this; |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return static The enum instance for given value |
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*/ |
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public static function get($value): EnumInterface |
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{ |
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// Return the cached instance for given value if it already exists: |
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if (null !== $instance = self::getCachedInstance($value)) { |
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return $instance; |
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} |
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if (!static::accepts($value)) { |
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throw new InvalidValueException($value, static::class); |
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} |
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return new static($value); |
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} |
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/** |
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* Instantiates a new enumeration. |
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* |
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* @param string $name The name of a particular enumerated constant |
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* @param array $arguments |
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* |
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* @throws \BadMethodCallException On invalid constant name |
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* |
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* @return static When $name is an existing constant for this enumeration type |
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*/ |
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public static function __callStatic($name, $arguments = []): EnumInterface |
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{ |
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if (!\defined('static::' . $name)) { |
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throw new \BadMethodCallException(sprintf( |
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'No constant named "%s" exists in class "%s"', |
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$name, |
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static::class |
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)); |
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} |
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return static::get(\constant('static::' . $name)); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function accepts($value): bool |
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{ |
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return \in_array($value, static::values(), true); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public static function instances(): array |
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{ |
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return array_map(static function ($value) { |
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return static::get($value); |
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}, static::values()); |
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} |
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private static function getCachedInstance($value) |
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{ |
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$enumType = static::class; |
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$identifier = serialize($value); |
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return self::$instances[$enumType][$identifier] ?? null; |
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} |
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/** |
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* {@inheritdoc} |
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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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* {@inheritdoc} |
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*/ |
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public function equals(EnumInterface $enum): bool |
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{ |
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return \get_class($this) === \get_class($enum) && $this->value === $enum->getValue(); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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public function is($value): bool |
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{ |
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return $this->getValue() === $value; |
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} |
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} |
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Elao /
PhpEnums
