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<?php |
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/* |
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* enum (https://github.com/phpgears/enum). |
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* Enum object for PHP. |
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* |
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* @license MIT |
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* @link https://github.com/phpgears/enum |
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* @author Julián Gutiérrez <[email protected]> |
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*/ |
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declare(strict_types=1); |
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namespace Gears\Enum; |
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use Gears\Enum\Exception\EnumException; |
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use Gears\Enum\Exception\InvalidEnumNameException; |
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use Gears\Enum\Exception\InvalidEnumValueException; |
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use Gears\Immutability\ImmutabilityBehaviour; |
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/** |
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* Base immutable enum class. |
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*/ |
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abstract class AbstractEnum implements Enum |
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{ |
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use ImmutabilityBehaviour; |
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/** |
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* Class is final checked map. |
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* |
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* @var bool[] |
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*/ |
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protected static $finalCheckMap = []; |
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/** |
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* Enum class constants map. |
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* |
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* @var array<string, mixed[]> |
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*/ |
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protected static $enumCacheMap = []; |
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/** |
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* Enum value. |
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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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* AbstractEnum constructor. |
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* |
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* @param static|mixed $value |
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* |
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* @throws EnumException |
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* @throws InvalidEnumValueException |
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*/ |
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final public function __construct($value) |
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{ |
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$this->assertImmutable(); |
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$this->assertFinal(); |
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$this->checkValue($value); |
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$this->value = $value instanceof Enum ? $value->getValue() : $value; |
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} |
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/** |
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* Assert enum is final. |
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* |
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* @throws EnumException |
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*/ |
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private function assertFinal(): void |
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{ |
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$class = static::class; |
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if (isset(static::$finalCheckMap[$class])) { |
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return; |
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} |
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if (!(new \ReflectionClass(static::class))->isFinal()) { |
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throw new EnumException(\sprintf('Enum class "%s" should be final.', static::class)); |
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} |
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static::$finalCheckMap[$class] = true; |
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} |
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/** |
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* Value based static constructor. |
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* |
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* @param string $name |
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* @param mixed[] $params |
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* |
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* @return self |
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*/ |
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final public static function __callStatic(string $name, array $params) |
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{ |
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if (\count($params) !== 0) { |
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throw new EnumException('Enum static constructor must be called with no parameters.'); |
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} |
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$enumerator = static::normalizeName($name); |
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$enumerators = static::getEnumerators(); |
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if (!\array_key_exists($enumerator, $enumerators)) { |
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throw new InvalidEnumNameException(\sprintf( |
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'"%s" is not a valid enumerator for enum "%s".', |
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$name, |
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static::class |
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)); |
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} |
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return new static($enumerators[$enumerator]); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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final public function isEqualTo(Enum $enum): bool |
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{ |
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return \get_class($enum) === static::class && $enum->getValue() === $this->value; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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final public function isAnyOf(array $enums): bool |
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{ |
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foreach ($enums as $enum) { |
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if ($this->isEqualTo($enum)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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final 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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* @return array<string, mixed> |
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*/ |
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final public function __serialize(): array |
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{ |
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return ['value' => $this->value]; |
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} |
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/** |
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* @param array<string, mixed> $data |
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* |
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* @SuppressWarnings(PHPMD.UnusedFormalParameter) |
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*/ |
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final public function __unserialize(array $data): void |
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{ |
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$this->assertImmutable(); |
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$this->assertFinal(); |
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$value = $data['value']; |
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$this->checkValue($value); |
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$this->value = $value; |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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final public function serialize(): string |
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{ |
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return \serialize($this->value); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @param mixed $serialized |
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*/ |
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public function unserialize($serialized): void |
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{ |
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$this->assertImmutable(); |
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$this->assertFinal(); |
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$value = \unserialize($serialized, ['allowed_classes' => false]); |
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$this->checkValue($value); |
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$this->value = $value; |
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} |
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final public function __clone() |
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{ |
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} |
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/** |
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* Check enum value validity. |
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* |
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* @param static|mixed $value |
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* |
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* @throws InvalidEnumValueException |
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*/ |
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private function checkValue($value): void |
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{ |
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if ($value instanceof Enum) { |
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if (\get_class($value) !== static::class) { |
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throw new InvalidEnumValueException(\sprintf( |
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'Enum "%s" cannot be created from enum "%s".', |
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static::class, |
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\get_class($value) |
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)); |
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} |
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return; |
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} |
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if (!\in_array($value, static::getEnumerators(), true)) { |
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throw new InvalidEnumValueException(\sprintf( |
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'"%s" is not a valid value for enum "%s".', |
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$value, |
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static::class |
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)); |
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} |
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} |
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/** |
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* Get list of enumerators. |
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* |
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* @return array<string, mixed> |
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*/ |
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private static function getEnumerators(): array |
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{ |
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$class = static::class; |
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if (!isset(static::$enumCacheMap[$class])) { |
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$constants = []; |
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foreach ((new \ReflectionClass($class))->getReflectionConstants() as $reflectionConstant) { |
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if ($reflectionConstant->isPublic()) { |
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$constants[static::normalizeName($reflectionConstant->getName())] = $reflectionConstant->getValue(); |
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} |
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} |
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static::$enumCacheMap[$class] = $constants; |
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} |
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return static::$enumCacheMap[$class]; |
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} |
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/** |
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* Normalize name. |
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* |
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* @param string $name |
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* |
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* @return string |
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*/ |
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private static function normalizeName(string $name): string |
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{ |
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return \strtoupper($name); |
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} |
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/** |
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* {@inheritdoc} |
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* |
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* @return string[] |
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*/ |
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final protected function getAllowedInterfaces(): array |
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{ |
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return [Enum::class]; |
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} |
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} |
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