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<?php
declare(strict_types=1);
namespace OpenTelemetry\API\Baggage;
use OpenTelemetry\Context\Context;
use OpenTelemetry\Context\ContextInterface;
use OpenTelemetry\Context\ContextKeys;
use OpenTelemetry\Context\ScopeInterface;
final class Baggage implements BaggageInterface
{
private static ?self $emptyBaggage = null;
/** @inheritDoc */
public static function fromContext(ContextInterface $context): BaggageInterface
{
return $context->get(ContextKeys::baggage()) ?? self::getEmpty();
}
/** @inheritDoc */
public static function getBuilder(): BaggageBuilderInterface
{
return new BaggageBuilder();
}
/** @inheritDoc */
public static function getCurrent(): BaggageInterface
{
return self::fromContext(Context::getCurrent());
}
/** @inheritDoc */
public static function getEmpty(): BaggageInterface
{
if (null === self::$emptyBaggage) {
self::$emptyBaggage = new self();
}
return self::$emptyBaggage;
}
/** @var array<string, Entry> */
private array $entries;
/** @param array<string, Entry> $entries */
public function __construct(array $entries = [])
{
$this->entries = $entries;
}
/** @inheritDoc */
public function activate(): ScopeInterface
{
return Context::getCurrent()->withContextValue($this)->activate();
}
/** @inheritDoc */
public function getEntry(string $key): ?Entry
{
return $this->entries[$key] ?? null;
}
/** @inheritDoc */
public function getValue(string $key)
{
if (($entry = $this->getEntry($key)) !== null) {
return $entry->getValue();
}
return null;
}
/** @inheritDoc */
public function getAll(): iterable
{
foreach ($this->entries as $key => $entry) {
yield $key => $entry;
}
}
/** @inheritDoc */
public function isEmpty(): bool
{
return $this->entries === [];
}
/** @inheritDoc */
public function toBuilder(): BaggageBuilderInterface
{
return new BaggageBuilder($this->entries);
}
/** @inheritDoc */
public function storeInContext(ContextInterface $context): ContextInterface
{
return $context->with(ContextKeys::baggage(), $this);
}
}
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