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<?php
declare(strict_types=1);
namespace OpenTelemetry\SDK\Common\Util;
use ArrayAccess;
use function assert;
use function class_exists;
use function count;
use Countable;
use Error;
use function get_class;
use function is_object;
use IteratorAggregate;
use const PHP_VERSION_ID;
use function spl_object_id;
use function sprintf;
use Traversable;
use TypeError;
use WeakReference;
/**
* @internal
*/
final class WeakMap implements ArrayAccess, Countable, IteratorAggregate
{
private const KEY = '__otel_weak_map';
/**
* @var array<int, WeakReference>
*/
private array $objects = [];
private function __construct()
{
}
/**
* @return ArrayAccess&Countable&IteratorAggregate
*/
public static function create(): ArrayAccess
{
if (PHP_VERSION_ID >= 80000) {
/** @phan-suppress-next-line PhanUndeclaredClassReference */
assert(class_exists(\WeakMap::class, false));
/** @phan-suppress-next-line PhanUndeclaredClassMethod */
$map = new \WeakMap();
assert($map instanceof ArrayAccess);
assert($map instanceof Countable);
assert($map instanceof IteratorAggregate);
return $map;
}
return new self();
}
public function offsetExists($offset): bool
{
if (!is_object($offset)) {
throw new TypeError('WeakMap key must be an object');
}
return isset($offset->{self::KEY}[spl_object_id($this)]);
}
/**
* @phan-suppress PhanUndeclaredClassAttribute
*/
#[\ReturnTypeWillChange]
public function offsetGet($offset)
{
if (!is_object($offset)) {
throw new TypeError('WeakMap key must be an object');
}
if (!$this->contains($offset)) {
throw new Error(sprintf('Object %s#%d not contained in WeakMap', get_class($offset), spl_object_id($offset)));
}
return $offset->{self::KEY}[spl_object_id($this)];
}
public function offsetSet($offset, $value): void
{
if ($offset === null) {
throw new Error('Cannot append to WeakMap');
}
if (!is_object($offset)) {
throw new TypeError('WeakMap key must be an object');
}
if (!$this->contains($offset)) {
$this->expunge();
}
$offset->{self::KEY}[spl_object_id($this)] = $value;
$this->objects[spl_object_id($offset)] = WeakReference::create($offset);
}
public function offsetUnset($offset): void
{
if (!is_object($offset)) {
throw new TypeError('WeakMap key must be an object');
}
if (!$this->contains($offset)) {
return;
}
unset(
$offset->{self::KEY}[spl_object_id($this)],
$this->objects[spl_object_id($offset)],
);
if (!$offset->{self::KEY}) {
unset($offset->{self::KEY});
}
}
public function count(): int
{
$this->expunge();
return count($this->objects);
}
public function getIterator(): Traversable
{
$this->expunge();
foreach ($this->objects as $reference) {
if (($object = $reference->get()) && $this->contains($object)) {
yield $object => $this[$object];
}
}
}
public function __debugInfo(): array
{
$debugInfo = [];
foreach ($this as $key => $value) {
$debugInfo[] = ['key' => $key, 'value' => $value];
}
return $debugInfo;
}
public function __destruct()
{
foreach ($this->objects as $reference) {
if ($object = $reference->get()) {
unset($this[$object]);
}
}
}
private function contains(object $offset): bool
{
$reference = $this->objects[spl_object_id($offset)] ?? null;
if ($reference && $reference->get() === $offset) {
return true;
}
unset($this->objects[spl_object_id($offset)]);
return false;
}
private function expunge(): void
{
foreach ($this->objects as $id => $reference) {
if (!$reference->get()) {
unset($this->objects[$id]);
}
}
}
}
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