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<?php
declare(strict_types=1);
namespace GuzzleHttp\Psr7;
use Psr\Http\Message\StreamInterface;
/**
* Stream decorator trait
*
* @property StreamInterface $stream
*/
trait StreamDecoratorTrait
{
/**
* @param StreamInterface $stream Stream to decorate
*/
public function __construct(StreamInterface $stream)
{
$this->stream = $stream;
}
/**
* Magic method used to create a new stream if streams are not added in
* the constructor of a decorator (e.g., LazyOpenStream).
*
* @return StreamInterface
*/
public function __get(string $name)
{
if ($name === 'stream') {
$this->stream = $this->createStream();
return $this->stream;
}
throw new \UnexpectedValueException("$name not found on class");
}
public function __toString(): string
{
try {
if ($this->isSeekable()) {
$this->seek(0);
}
return $this->getContents();
} catch (\Throwable $e) {
if (\PHP_VERSION_ID >= 70400) {
throw $e;
}
trigger_error(sprintf('%s::__toString exception: %s', self::class, (string) $e), E_USER_ERROR);
return '';
}
}
public function getContents(): string
{
return Utils::copyToString($this);
}
/**
* Allow decorators to implement custom methods
*
* @return mixed
*/
public function __call(string $method, array $args)
{
/** @var callable $callable */
$callable = [$this->stream, $method];
$result = ($callable)(...$args);
// Always return the wrapped object if the result is a return $this
return $result === $this->stream ? $this : $result;
}
public function close(): void
{
$this->stream->close();
}
/**
* @return mixed
*/
public function getMetadata($key = null)
{
return $this->stream->getMetadata($key);
}
public function detach()
{
return $this->stream->detach();
}
public function getSize(): ?int
{
return $this->stream->getSize();
}
public function eof(): bool
{
return $this->stream->eof();
}
public function tell(): int
{
return $this->stream->tell();
}
public function isReadable(): bool
{
return $this->stream->isReadable();
}
public function isWritable(): bool
{
return $this->stream->isWritable();
}
public function isSeekable(): bool
{
return $this->stream->isSeekable();
}
public function rewind(): void
{
$this->seek(0);
}
public function seek($offset, $whence = SEEK_SET): void
{
$this->stream->seek($offset, $whence);
}
public function read($length): string
{
return $this->stream->read($length);
}
public function write($string): int
{
return $this->stream->write($string);
}
/**
* Implement in subclasses to dynamically create streams when requested.
*
* @throws \BadMethodCallException
*/
protected function createStream(): StreamInterface
{
throw new \BadMethodCallException('Not implemented');
}
}
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