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<?php |
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/** |
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* This file is part of the ZBateson\MailMimeParser project. |
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* |
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* @license http://opensource.org/licenses/bsd-license.php BSD |
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*/ |
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namespace ZBateson\MailMimeParser\Parser\Part; |
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use ZBateson\MailMimeParser\Message\PartStreamContainer; |
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use ZBateson\MailMimeParser\Parser\Proxy\ParserPartProxy; |
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use ZBateson\MailMimeParser\Stream\StreamFactory; |
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use Psr\Http\Message\StreamInterface; |
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use SplObserver; |
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use SplSubject; |
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/** |
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* A part stream container that proxies requests for content streams to a parser |
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* to read the content. |
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* |
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* Keeps reference to the original stream a part was parsed from, using that |
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* stream as the part's stream instead of the PartStreamContainer's |
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* MessagePartStream (which dynamically creates a stream from an IMessagePart) |
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* unless the part changed. |
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* |
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* The ParserPartStreamContainer must also be attached to its underlying part |
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* with SplSubject::attach() so the ParserPartStreamContainer gets notified of |
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* any changes. |
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* |
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* @author Zaahid Bateson |
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*/ |
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class ParserPartStreamContainer extends PartStreamContainer implements SplObserver |
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{ |
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/** |
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* @var ParserPartProxy The parser proxy to ferry requests to on-demand. |
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*/ |
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protected $parserProxy; |
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/** |
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* @var StreamInterface the original stream for a parsed message, used when |
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* the message hasn't changed |
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*/ |
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protected $parsedStream; |
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/** |
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* @var bool true if the stream should be detached when this container is |
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* destroyed (thereby not closing the stream). |
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*/ |
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protected $detachParsedStream = false; |
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/** |
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* @var bool set to true if the part's been updated since it was created. |
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*/ |
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protected $partUpdated = false; |
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/** |
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* @var bool false if the content for the part represented by this container |
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* has not yet been requested from the parser. |
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*/ |
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protected $contentParseRequested = false; |
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public function __construct(StreamFactory $streamFactory, ParserPartProxy $parserProxy) |
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{ |
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parent::__construct($streamFactory); |
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$this->parserProxy = $parserProxy; |
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} |
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public function __destruct() |
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{ |
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if ($this->detachParsedStream && $this->parsedStream !== null) { |
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$this->parsedStream->detach(); |
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} |
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} |
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/** |
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* Requests content from the parser if not previously requested, and calls |
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* PartStreamContainer::setContentStream(). |
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*/ |
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protected function requestParsedContentStream() |
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{ |
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if (!$this->contentParseRequested) { |
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$this->contentParseRequested = true; |
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$this->parserProxy->parseContent(); |
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parent::setContentStream($this->streamFactory->getLimitedContentStream( |
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$this->parserProxy |
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)); |
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} |
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} |
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/** |
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* Ensures the parser has parsed the entire part, and sets |
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* $this->parsedStream to the original parsed stream (or a limited part of |
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* it corresponding to the current part this stream container belongs to). |
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*/ |
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protected function requestParsedStream() |
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{ |
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if ($this->parsedStream === null) { |
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$this->parserProxy->parseAll(); |
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$this->parsedStream = $this->streamFactory->getLimitedPartStream( |
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$this->parserProxy |
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); |
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if ($this->parsedStream !== null) { |
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$this->detachParsedStream = ($this->parsedStream->getMetadata('mmp-detached-stream') === true); |
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} |
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} |
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} |
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public function hasContent() |
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{ |
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$this->requestParsedContentStream(); |
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return parent::hasContent(); |
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} |
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public function getContentStream($transferEncoding, $fromCharset, $toCharset) |
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{ |
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$this->requestParsedContentStream(); |
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return parent::getContentStream($transferEncoding, $fromCharset, $toCharset); |
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} |
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public function getBinaryContentStream($transferEncoding) |
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{ |
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$this->requestParsedContentStream(); |
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return parent::getBinaryContentStream($transferEncoding); |
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} |
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public function setContentStream(StreamInterface $contentStream = null) |
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{ |
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// has to be overridden because requestParsedContentStream calls |
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// parent::setContentStream as well, so needs to be parsed before |
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// overriding the contentStream with a manual 'set'. |
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$this->requestParsedContentStream(); |
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parent::setContentStream($contentStream); |
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} |
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public function getStream() |
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{ |
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$this->requestParsedStream(); |
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if (!$this->partUpdated) { |
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if ($this->parsedStream !== null) { |
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$this->parsedStream->rewind(); |
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return $this->parsedStream; |
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} |
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} |
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return parent::getStream(); |
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} |
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public function update(SplSubject $subject) |
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{ |
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$this->partUpdated = true; |
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} |
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} |
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zbateson /
mail-mime-parser
