ContextStorageNode.php

<?php

declare (strict_types=1);
namespace OpenTelemetry\Context;

use function assert;

/**
 * @internal
 */
final class ContextStorageNode implements ScopeInterface, ContextStorageScopeInterface {
    private array $localStorage = [];
    public function __construct(ContextInterface $context, ContextStorageHead $head, ?ContextStorageNode $previous = null) {
    }
    public function offsetExists(mixed $offset) : bool {
        return isset($this->localStorage[$offset]);
    }
    public function offsetGet(mixed $offset) : mixed {
        return $this->localStorage[$offset];
    }
    public function offsetSet(mixed $offset, mixed $value) : void {
        $this->localStorage[$offset] = $value;
    }
    public function offsetUnset(mixed $offset) : void {
        unset($this->localStorage[$offset]);
    }
    public function context() : ContextInterface {
        return $this->context;
    }
    public function detach() : int {
        $flags = 0;
        if ($this->head !== $this->head->storage
            ->head()) {
            $flags |= ScopeInterface::INACTIVE;
        }
        if ($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() {
    }

}