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<?php |
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/** |
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* @author Matthijs van den Bos <[email protected]> |
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* @copyright 2013 Matthijs van den Bos |
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*/ |
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namespace VDB\Spider\PersistenceHandler; |
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use Symfony\Component\Finder\Finder; |
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use VDB\Spider\Resource; |
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abstract class FilePersistenceHandler implements PersistenceHandlerInterface |
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{ |
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/** |
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* @var string the path where all spider results should be persisted. |
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* The results will be grouped in a directory by spider ID. |
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*/ |
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protected $path = ''; |
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protected $spiderId = ''; |
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protected $totalSizePersisted = 0; |
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/** @var \Iterator */ |
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protected $iterator; |
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/** @var Finder */ |
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protected $finder; |
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/** |
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* @param string $path the path where all spider results should be persisted. |
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* The results will be grouped in a directory by spider ID. |
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*/ |
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public function __construct($path) |
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{ |
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$this->path = $path; |
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} |
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public function setSpiderId($spiderId) |
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{ |
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$this->spiderId = $spiderId; |
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// create the path |
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if (!file_exists($this->getResultPath())) { |
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mkdir($this->getResultPath(), 0700, true); |
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} |
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} |
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public function count() |
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{ |
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return $this->getFinder()->count(); |
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} |
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protected function getResultPath() |
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{ |
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return $this->path . DIRECTORY_SEPARATOR . $this->spiderId . DIRECTORY_SEPARATOR; |
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} |
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abstract public function persist(Resource $resource); |
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/** |
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* @return Finder |
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*/ |
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protected function getFinder() |
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{ |
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if (!$this->finder instanceof Finder) { |
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$this->finder = Finder::create()->files()->in($this->getResultPath()); |
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} |
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return $this->finder; |
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} |
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/** |
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* @return \Iterator |
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*/ |
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protected function getIterator() |
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{ |
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if (!$this->iterator instanceof \Iterator) { |
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$this->iterator = $this->getFinder()->getIterator(); |
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} |
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return $this->iterator; |
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} |
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/** |
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* Encodes file name into suitable format and trims its size. |
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* File name length is limited 255 chars, on Win32 a whole file path is limited 260 chars. |
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* @param string $fileName |
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* @return string |
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*/ |
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protected function encodeFileName($fileName) |
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{ |
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return md5($fileName); |
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} |
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/** |
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* @return Resource |
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*/ |
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abstract public function current(); |
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/** |
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* @return void |
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*/ |
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public function next() |
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{ |
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$this->getIterator()->next(); |
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} |
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/** |
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* @return integer|double|string|boolean|null |
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*/ |
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public function key() |
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{ |
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return $this->getIterator()->key(); |
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} |
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/** |
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* @return boolean |
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*/ |
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public function valid() |
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{ |
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return $this->getIterator()->valid(); |
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} |
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/** |
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* @return void |
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*/ |
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public function rewind() |
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{ |
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$this->getIterator()->rewind(); |
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} |
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} |
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|
mvdbos /
php-spider
