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<?php
declare(strict_types=1);
namespace OpenTelemetry\Context;
use function assert;
/**
* @internal
*/
final class ContextStorageNode implements ScopeInterface, ContextStorageScopeInterface
{
public ContextInterface $context;
public ContextStorageHead $head;
private ?ContextStorageNode $previous;
private array $localStorage = [];
public function __construct(
ContextInterface $context,
ContextStorageHead $head,
?ContextStorageNode $previous = null
) {
$this->context = $context;
$this->head = $head;
$this->previous = $previous;
}
public function offsetExists($offset): bool
{
return isset($this->localStorage[$offset]);
}
/**
* @phan-suppress PhanUndeclaredClassAttribute
*/
#[\ReturnTypeWillChange]
public function offsetGet($offset)
{
return $this->localStorage[$offset];
}
public function offsetSet($offset, $value): void
{
$this->localStorage[$offset] = $value;
}
public function offsetUnset($offset): void
{
unset($this->localStorage[$offset]);
}
public function context(): ContextInterface
{
return $this->context;
}
public function detach(): int
{
$flags = 0;
if ($this->head !== $this->head->storage->current) {
$flags |= ScopeInterface::INACTIVE;
}
if ($this === $this->head->node) {
assert($this->previous !== $this);
$this->head->node = $this->previous;
$this->previous = $this;
return $flags;
}
if ($this->previous === $this) {
return $flags | ScopeInterface::DETACHED;
}
assert($this->head->node !== null);
for ($n = $this->head->node, $depth = 1;
$n->previous !== $this;
$n = $n->previous, $depth++) {
assert($n->previous !== null);
}
$n->previous = $this->previous;
$this->previous = $this;
return $flags | ScopeInterface::MISMATCH | $depth;
}
private function __clone()
{
}
}
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