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<?php |
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namespace Wikibase\JsonDumpReader\Reader; |
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use Wikibase\JsonDumpReader\SeekableDumpReader; |
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use Wikibase\JsonDumpReader\DumpReadingException; |
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/** |
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* Package private |
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* |
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* @licence GNU GPL v2+ |
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* @author Jeroen De Dauw < [email protected] > |
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*/ |
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class GzDumpReader implements SeekableDumpReader { |
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/** |
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* @var string |
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*/ |
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private $dumpFile; |
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/** |
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* @var int |
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*/ |
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private $initialPosition; |
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/** |
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* @var resource|null |
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*/ |
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private $handle = null; |
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/** |
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* @param string $dumpFilePath |
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* @param int $initialPosition |
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*/ |
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public function __construct( $dumpFilePath, $initialPosition = 0 ) { |
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$this->dumpFile = $dumpFilePath; |
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$this->initialPosition = $initialPosition; |
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} |
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public function __destruct() { |
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$this->closeReader(); |
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} |
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private function closeReader() { |
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if ( is_resource( $this->handle ) ) { |
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gzclose( $this->handle ); |
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$this->handle = null; |
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} |
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} |
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public function rewind() { |
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$this->closeReader(); |
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$this->initReader(); |
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} |
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private function initReader() { |
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if ( $this->handle === null ) { |
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$this->handle = @gzopen( $this->dumpFile, 'r' ); |
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if ( $this->handle === false ) { |
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throw new DumpReadingException( 'Could not open file: ' . $this->dumpFile ); |
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} |
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$this->seekToPosition( $this->initialPosition ); |
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} |
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} |
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/** |
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* @return string|null |
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* @throws DumpReadingException |
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*/ |
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public function nextJsonLine() { |
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$this->initReader(); |
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do { |
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if ( gzeof( $this->handle ) ) { |
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return null; |
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} |
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$line = @gzgets( $this->handle ); |
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if ( $line === false ) { |
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return null; |
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} |
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} |
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while ( $line === '' || $line{0} !== '{' ); |
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return rtrim( $line, ",\n\r" ); |
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} |
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/** |
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* @return int |
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* @throws DumpReadingException |
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*/ |
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public function getPosition() { |
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if ( PHP_INT_SIZE < 8 ) { |
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throw new DumpReadingException( 'Cannot reliably get the file position on 32bit PHP' ); |
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} |
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$this->initReader(); |
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$position = @gztell( $this->handle ); |
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if ( !is_int( $position ) ) { |
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throw new DumpReadingException( 'Could not tell the position of the file handle' ); |
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} |
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return $position; |
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} |
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/** |
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* @param int $position |
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* @throws DumpReadingException |
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*/ |
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public function seekToPosition( $position ) { |
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$this->initReader(); |
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$seekResult = @gzseek( $this->handle, $position ); |
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if ( $seekResult !== 0 ) { |
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throw new DumpReadingException( 'Seeking to position failed' ); |
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} |
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} |
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} |
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JeroenDeDauw /
JsonDumpReader
