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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\Guess\Guess;
use Symfony\Component\Form\Exception\UnexpectedTypeException;
class FormTypeGuesserChain implements FormTypeGuesserInterface
{
private $guessers = array();
/**
* Constructor.
*
* @param array $guessers Guessers as instances of FormTypeGuesserInterface
*
* @throws UnexpectedTypeException if any guesser does not implement FormTypeGuesserInterface
*/
public function __construct(array $guessers)
{
foreach ($guessers as $guesser) {
if (!$guesser instanceof FormTypeGuesserInterface) {
throw new UnexpectedTypeException($guesser, 'Symfony\Component\Form\FormTypeGuesserInterface');
}
if ($guesser instanceof self) {
$this->guessers = array_merge($this->guessers, $guesser->guessers);
} else {
$this->guessers[] = $guesser;
}
}
}
/**
* {@inheritDoc}
*/
public function guessType($class, $property)
{
return $this->guess(function ($guesser) use ($class, $property) {
return $guesser->guessType($class, $property);
});
}
/**
* {@inheritDoc}
*/
public function guessRequired($class, $property)
{
return $this->guess(function ($guesser) use ($class, $property) {
return $guesser->guessRequired($class, $property);
});
}
/**
* {@inheritDoc}
*/
public function guessMaxLength($class, $property)
{
return $this->guess(function ($guesser) use ($class, $property) {
return $guesser->guessMaxLength($class, $property);
});
}
/**
* {@inheritDoc}
*/
public function guessPattern($class, $property)
{
return $this->guess(function ($guesser) use ($class, $property) {
return $guesser->guessPattern($class, $property);
});
}
/**
* Executes a closure for each guesser and returns the best guess from the
* return values
*
* @param \Closure $closure The closure to execute. Accepts a guesser
* as argument and should return a Guess instance
*
* @return Guess The guess with the highest confidence
*/
private function guess(\Closure $closure)
{
$guesses = array();
foreach ($this->guessers as $guesser) {
if ($guess = $closure($guesser)) {
$guesses[] = $guess;
}
}
return Guess::getBestGuess($guesses);
}
}
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