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