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<?php |
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namespace Wambo\Catalog; |
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use League\Flysystem\FilesystemInterface; |
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use Wambo\Catalog\Error\CatalogException; |
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use Wambo\Catalog\Error\JSONException; |
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use Wambo\Catalog\Mapper\CatalogMapper; |
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use Wambo\Catalog\Model\Catalog; |
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/** |
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* Class JSONCatalogReader reads product and catalog data from an JSON file. |
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*/ |
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class JSONCatalogReader implements CatalogReaderInterface |
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{ |
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/** |
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* @var FilesystemInterface $filesystem The filesystem this Catalog instance works on |
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*/ |
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private $filesystem; |
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/** |
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* @var string $catalogFilePath The path to the JSON file containing the catalog in the given $filesystem |
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*/ |
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private $catalogFilePath; |
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/** |
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* @var CatalogMapper A catalog mapper for converting unstructured catalog data into Catalog models |
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*/ |
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private $catalogMapper; |
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/** |
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* Creates a new instance of the JSONCatalogReader class. |
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* |
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* @param FilesystemInterface $filesystem The filesystem this Catalog instance works on |
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* @param string $catalogFilePath The path to the JSON file containing the catalog in the given |
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* $filesystem |
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* |
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* @param CatalogMapper $catalogMapper A catalog mapper for converting unstructured catalog data into |
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* Catalog models |
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*/ |
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public function __construct(FilesystemInterface $filesystem, string $catalogFilePath, CatalogMapper $catalogMapper) |
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{ |
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$this->filesystem = $filesystem; |
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$this->catalogFilePath = $catalogFilePath; |
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$this->catalogMapper = $catalogMapper; |
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} |
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/** |
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* Get the product catalog. |
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* |
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* @return Catalog |
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* |
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* @throws CatalogException If the catalog could not be created. |
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*/ |
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public function getCatalog() |
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{ |
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if ($this->filesystem->has($this->catalogFilePath) === false) { |
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return new Catalog([]); |
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} |
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try { |
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$json = $this->filesystem->read($this->catalogFilePath); |
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// handle read errors |
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if ($json === false) { |
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throw new CatalogException(sprintf("Failed to read %s", $this->catalogFilePath)); |
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} |
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$catalogData = $this->parseJSON($json); |
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// convert the catalog data into a Catalog model |
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$catalog = $this->catalogMapper->getCatalog($catalogData); |
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return $catalog; |
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} catch (\Exception $catalogException) { |
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throw new CatalogException(sprintf("Unable to read catalog from %s: ", $this->catalogFilePath, |
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$catalogException->getMessage()), $catalogException); |
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} |
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} |
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/** |
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* Parse the given JSON and convert it into an array. |
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* |
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* @param string $json JSON code |
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* |
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* @return array |
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* |
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* @throws JSONException If the given JSON could not be parsed |
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*/ |
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private function parseJSON($json) |
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{ |
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$catalogData = json_decode($json, true); |
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// handle errors |
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switch (json_last_error()) { |
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case JSON_ERROR_DEPTH: |
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throw new JSONException("The maximum stack depth has been exceeded"); |
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case JSON_ERROR_STATE_MISMATCH: |
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throw new JSONException("Invalid or malformed JSON"); |
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case JSON_ERROR_CTRL_CHAR: |
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throw new JSONException("Control character error, possibly incorrectly encoded"); |
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case JSON_ERROR_SYNTAX: |
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throw new JSONException("Syntax error"); |
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case JSON_ERROR_UTF8: |
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throw new JSONException("Malformed UTF-8 characters, possibly incorrectly encoded"); |
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} |
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return $catalogData; |
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} |
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} |
wambo-co /
module-catalog
