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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Intl\Data\Util; use Symfony\Component\Intl\Exception\OutOfBoundsException; /** * Implements a ring buffer. * * A ring buffer is an array-like structure with a fixed size. If the buffer * is full, the next written element overwrites the first bucket in the buffer, * then the second and so on. * * @author Bernhard Schussek <bschussek@gmail.com> * * @template TKey of array-key * @template TValue * * @implements \ArrayAccess<TKey, TValue> * * @internal */ class RingBuffer implements \ArrayAccess { /** @var array<int, TValue> */ private array $values = []; /** @var array<TKey, int> */ private array $indices = []; private int $cursor = 0; public function __construct( private int $size, ) { } public function offsetExists(mixed $key): bool { return isset($this->indices[$key]); } public function offsetGet(mixed $key): mixed { if (!isset($this->indices[$key])) { throw new OutOfBoundsException(\sprintf('The index "%s" does not exist.', $key)); } return $this->values[$this->indices[$key]]; } public function offsetSet(mixed $key, mixed $value): void { if (false !== ($keyToRemove = array_search($this->cursor, $this->indices))) { unset($this->indices[$keyToRemove]); } $this->values[$this->cursor] = $value; $this->indices[$key] = $this->cursor; $this->cursor = ($this->cursor + 1) % $this->size; } public function offsetUnset(mixed $key): void { if (isset($this->indices[$key])) { $this->values[$this->indices[$key]] = null; unset($this->indices[$key]); } } }
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