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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\Form; use Symfony\Component\Form\Exception\TransformationFailedException; /** * Transforms a value between different representations. * * @author Bernhard Schussek <bschussek@gmail.com> * * @template TValue * @template TTransformedValue */ interface DataTransformerInterface { /** * Transforms a value from the original representation to a transformed representation. * * This method is called when the form field is initialized with its default data, on * two occasions for two types of transformers: * * 1. Model transformers which normalize the model data. * This is mainly useful when the same form type (the same configuration) * has to handle different kind of underlying data, e.g The DateType can * deal with strings or \DateTime objects as input. * * 2. View transformers which adapt the normalized data to the view format. * a/ When the form is simple, the value returned by convention is used * directly in the view and thus can only be a string or an array. In * this case the data class should be null. * * b/ When the form is compound the returned value should be an array or * an object to be mapped to the children. Each property of the compound * data will be used as model data by each child and will be transformed * too. In this case data class should be the class of the object, or null * when it is an array. * * All transformers are called in a configured order from model data to view value. * At the end of this chain the view data will be validated against the data class * setting. * * This method must be able to deal with empty values. Usually this will * be NULL, but depending on your implementation other empty values are * possible as well (such as empty strings). The reasoning behind this is * that data transformers must be chainable. If the transform() method * of the first data transformer outputs NULL, the second must be able to * process that value. * * @param TValue|null $value The value in the original representation * * @return mixed * * @psalm-return TTransformedValue|null * * @throws TransformationFailedException when the transformation fails */ public function transform(mixed $value); /** * Transforms a value from the transformed representation to its original * representation. * * This method is called when {@link Form::submit()} is called to transform the requests tainted data * into an acceptable format. * * The same transformers are called in the reverse order so the responsibility is to * return one of the types that would be expected as input of transform(). * * This method must be able to deal with empty values. Usually this will * be an empty string, but depending on your implementation other empty * values are possible as well (such as NULL). The reasoning behind * this is that value transformers must be chainable. If the * reverseTransform() method of the first value transformer outputs an * empty string, the second value transformer must be able to process that * value. * * By convention, reverseTransform() should return NULL if an empty string * is passed. * * @param TTransformedValue|null $value The value in the transformed representation * * @return mixed * * @psalm-return TValue|null * * @throws TransformationFailedException when the transformation fails */ public function reverseTransform(mixed $value); }