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<?php |
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declare(strict_types=1); |
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namespace Roave\BackwardCompatibility; |
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use Countable; |
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use Generator; |
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use IteratorAggregate; |
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use Traversable; |
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use function count; |
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use function iterator_to_array; |
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final class Changes implements IteratorAggregate, Countable |
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{ |
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/** @var Change[] */ |
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private $bufferedChanges; |
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/** @var iterable|Change[]|null */ |
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private $unBufferedChanges; |
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private function __construct() |
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{ |
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} |
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public static function empty() : self |
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{ |
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static $empty; |
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if ($empty) { |
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return $empty; |
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} |
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$empty = new self(); |
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$empty->bufferedChanges = []; |
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return $empty; |
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} |
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/** @param iterable|Change[] $changes */ |
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public static function fromIterator(iterable $changes) : self |
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{ |
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$instance = new self(); |
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$instance->bufferedChanges = []; |
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$instance->unBufferedChanges = $changes; |
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return $instance; |
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} |
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public static function fromList(Change ...$changes) : self |
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{ |
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$instance = new self(); |
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$instance->bufferedChanges = $changes; |
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return $instance; |
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} |
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public function mergeWith(self $other) : self |
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{ |
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$instance = new self(); |
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$instance->bufferedChanges = []; |
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$instance->unBufferedChanges = (function () use ($other) : Generator { |
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foreach ($this as $change) { |
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yield $change; |
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} |
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foreach ($other as $change) { |
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yield $change; |
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} |
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})(); |
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return $instance; |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return Traversable<int, Change> |
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*/ |
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public function getIterator() : iterable |
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{ |
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foreach ($this->bufferedChanges as $change) { |
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yield $change; |
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} |
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foreach ($this->unBufferedChanges ?? [] as $change) { |
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$this->bufferedChanges[] = $change; |
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yield $change; |
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} |
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$this->unBufferedChanges = null; |
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} |
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public function count() : int |
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{ |
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return count(iterator_to_array($this)); |
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} |
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} |
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Roave /
BackwardCompatibilityCheck
