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<?php |
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/** |
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* TechDivision\Import\Product\Loaders\MediaRolesLoader |
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* |
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* @author Marcus Döllerer <[email protected]> |
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* @copyright 2020 TechDivision GmbH <[email protected]> |
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* @license http://opensource.org/licenses/osl-3.0.php Open Software License (OSL 3.0) |
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* @link https://github.com/techdivision/import |
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* @link https://www.techdivision.com |
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*/ |
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namespace TechDivision\Import\Product\Loaders; |
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use TechDivision\Import\Loaders\LoaderInterface; |
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use TechDivision\Import\Product\Utils\ColumnKeys; |
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use TechDivision\Import\Services\ImportProcessorInterface; |
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/** |
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* Loader for media roles. |
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* |
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* @author Marcus Döllerer <[email protected]> |
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* @copyright 2020 TechDivision GmbH <[email protected]> |
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* @link https://www.techdivision.com |
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*/ |
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class MediaRolesLoader implements LoaderInterface |
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{ |
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/** |
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* The media roles array (default: ['base', 'small', 'thumbnail', 'swatch']). |
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* |
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* @var array |
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*/ |
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protected $mediaRoles = array(); |
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/** |
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* The import processor. |
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* |
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* @var ImportProcessorInterface |
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*/ |
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protected $importProcessor; |
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/** |
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* ImageMediaRolesLoader constructor |
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* |
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* @param ImportProcessorInterface $importProcessor The import processor. |
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*/ |
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public function __construct(ImportProcessorInterface $importProcessor) |
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{ |
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$this->importProcessor = $importProcessor; |
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$this->mediaRoles = $this->createMediaRoles(); |
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} |
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/** |
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* @return \ArrayAccess|void|array |
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*/ |
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public function load() |
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{ |
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return $this->mediaRoles; |
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} |
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/** |
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* Creates media roles from available image types. |
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* |
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* @return array |
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*/ |
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public function createMediaRoles() |
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{ |
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// initialize default values |
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$mediaRoles = array(); |
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// derive media roles form image types |
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foreach ($this->importProcessor->getImageTypes() as $imageColumnName => $imageLabelColumnName) { |
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// create the role based prefix for the image columns |
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$role = str_replace('_image', null, $imageColumnName); |
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// initialize the values for the corresponding media role |
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$mediaRoles[$role] = array( |
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ColumnKeys::IMAGE_PATH => $imageColumnName, |
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ColumnKeys::IMAGE_LABEL => $imageLabelColumnName, |
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ColumnKeys::IMAGE_POSITION => sprintf('%s_image_position', $role) |
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); |
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} |
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return $mediaRoles; |
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} |
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} |
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If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design.
Let’s take a look at an example:
Our function
my_function
expects aPost
object, and outputs the author of the post. The base classPost
returns a simple string and outputting a simple string will work just fine. However, the child classBlogPost
which is a sub-type ofPost
instead decided to return anobject
, and is therefore violating the SOLID principles. If aBlogPost
were passed tomy_function
, PHP would not complain, but ultimately fail when executing thestrtoupper
call in its body.