use SpareParts\Enum\Exception\InvalidEnumSetupException;
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use SpareParts\Enum\Exception\InvalidEnumValueException;
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/**
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*
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*/
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abstract class Enum
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{
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/**
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* @var string[]
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*/
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protected static $values = [];
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/**
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* @var $this[]
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*/
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protected static $instances = [];
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/**
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* @var string
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*/
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protected $value;
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/**
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* PROTECTED!! Not callable directly.
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* @see static::instance()
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* @see static::__callStatic()
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* @internal
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*
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* @param string $value
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*/
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protected function __construct($value)
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{
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if (empty(static::$values)) {
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throw new InvalidEnumSetupException('Incorrect setup! Enum '.get_called_class().' doesn\'t have its static::$values set.');
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}
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if (!in_array($value, static::$values)) {
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throw new InvalidEnumValueException('Enum '.get_called_class().'does not contain value '.$value.'. Possible values are: '.implode(', ', static::$values));
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}
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$this->value = $value;
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}
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/**
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*
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*/
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public function __toString()
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{
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return $this->value;
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}
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/**
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* @param string $method
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* @param array $args
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*
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* @return \SpareParts\Enum\Enum
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*/
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public static function __callStatic($method, $args)
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{
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return static::instance($method);
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}
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/**
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* @param string $value
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*
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* @return $this
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*/
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public static function instance($value)
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{
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if (!isset(static::$instances[get_called_class()][$value])) {
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static::$instances[get_called_class()][$value] = new static($value);
SpareParts /
Enum
