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<?php |
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/* |
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* This file is part of the ONGR package. |
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* |
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* (c) NFQ Technologies UAB <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace ONGR\ElasticsearchBundle\Service\Json; |
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/** |
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* Serializes records one by one. Outputs given metadata before first record. |
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* |
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* Sample output: |
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* <p> |
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* [ |
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* {"count":2}, |
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* {"_id":"doc1","title":"Document 1"}, |
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* {"_id":"doc2","title":"Document 2"} |
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* ] |
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* </p> |
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*/ |
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class JsonWriter |
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{ |
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private $filename; |
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private $handle; |
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private $count; |
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private $currentPosition = 0; |
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public function __construct(string $filename, int $count) |
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{ |
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$this->filename = $filename; |
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$this->count = $count; |
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} |
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/** |
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* Destructor. Closes file handler if open. |
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*/ |
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public function __destruct() |
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{ |
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$this->finalize(); |
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} |
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/** |
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* Performs initialization. |
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*/ |
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protected function initialize() |
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{ |
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if ($this->handle !== null) { |
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return; |
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} |
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$this->handle = fopen($this->filename, 'w'); |
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fwrite($this->handle, "[\n"); |
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fwrite($this->handle, json_encode(['count' => $this->count])); |
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} |
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/** |
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* Performs finalization. |
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*/ |
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public function finalize() |
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{ |
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$this->initialize(); |
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if (is_resource($this->handle)) { |
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fwrite($this->handle, "\n]"); |
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fclose($this->handle); |
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} |
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} |
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/** |
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* Writes single document to stream. |
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* |
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* @param mixed $document Object to insert into stream. |
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* |
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* @throws \OverflowException |
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*/ |
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public function push($document) |
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{ |
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$this->initialize(); |
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$this->currentPosition++; |
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if (isset($this->count) && $this->currentPosition > $this->count) { |
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throw new \OverflowException( |
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sprintf('This writer was set up to write %d documents, got more.', $this->count) |
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); |
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} |
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fwrite($this->handle, ",\n"); |
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fwrite($this->handle, json_encode($document)); |
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if (isset($this->count) && $this->currentPosition == $this->count) { |
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$this->finalize(); |
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} |
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} |
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} |
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ongr-io /
ElasticsearchBundle
