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<?php |
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namespace SpareParts\Enum\Set\Converter; |
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use SpareParts\Enum\Enum; |
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use SpareParts\Enum\Exception\EnumSetMustContainEnumsException; |
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use SpareParts\Enum\Set\ISet; |
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use SpareParts\Enum\Set\ImmutableSet; |
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class BitMaskConverter implements IEnumSetConverter |
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{ |
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/** |
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* @var string |
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*/ |
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private $enumClass; |
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/** |
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* @var array |
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*/ |
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private $mapping; |
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/** |
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* @param Enum[] $enumValuesMap |
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*/ |
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public function __construct(iterable $enumValuesMap) |
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{ |
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if (!count($enumValuesMap)) { |
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throw new EnumSetMustContainEnumsException('You have to provide converter mapping.'); |
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} |
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$this->mapping = $this->prepareInnerMapping($enumValuesMap); |
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} |
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/** |
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* @param int $values A number representing a bit mask |
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* @return ISet |
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*/ |
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public function convertToEnumSet($values) : ISet |
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{ |
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$bitValue = (int) $values; |
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$set = []; |
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foreach ($this->mapping as $value => $bit) { |
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if ($bitValue & $bit) { |
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$set[] = call_user_func([$this->enumClass, 'instance'], $value); |
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} |
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} |
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return new ImmutableSet($this->enumClass, $set); |
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} |
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public function convertFromEnumSet(ISet $enumSet): int |
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{ |
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$bitValue = 0; |
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/** @var Enum $value */ |
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foreach ($enumSet as $value) { |
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$bitValue = $bitValue | $this->mapping[(string) $value]; |
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} |
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return $bitValue; |
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} |
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private function prepareInnerMapping(iterable $enumValuesMap): array |
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{ |
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// translate enum values to bit values mapping |
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$innerMapping = []; |
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$shift = 0; |
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foreach ($enumValuesMap as $value) { |
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$this->updateEnumClass($value); |
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$innerMapping[(string)$value] = 1 << $shift; |
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$shift++; |
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} |
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return $innerMapping; |
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} |
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private function updateEnumClass(Enum $value): void |
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{ |
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// try to guess enum class |
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if (is_null($this->enumClass)) { |
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$this->enumClass = get_class($value); |
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} |
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if (!is_object($value) || !($value instanceof $this->enumClass)) { |
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throw new EnumSetMustContainEnumsException(sprintf("Expected `%s`, got `%s`", $this->enumClass, $this->printVar($value))); |
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} |
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} |
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/** |
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* @param mixed $value |
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* @return string |
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*/ |
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private function printVar($value): string |
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{ |
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return is_object($value) ? get_class($value) : var_export($value, true); |
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} |
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} |
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SpareParts /
Enum
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