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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\Guess;
use Symfony\Component\Form\Exception\InvalidArgumentException;
/**
* Base class for guesses made by TypeGuesserInterface implementation
*
* Each instance contains a confidence value about the correctness of the guess.
* Thus an instance with confidence HIGH_CONFIDENCE is more likely to be
* correct than an instance with confidence LOW_CONFIDENCE.
*
* @author Bernhard Schussek <bschussek@gmail.com>
*/
abstract class Guess
{
/**
* Marks an instance with a value that is extremely likely to be correct
* @var integer
*/
const VERY_HIGH_CONFIDENCE = 3;
/**
* Marks an instance with a value that is very likely to be correct
* @var integer
*/
const HIGH_CONFIDENCE = 2;
/**
* Marks an instance with a value that is likely to be correct
* @var integer
*/
const MEDIUM_CONFIDENCE = 1;
/**
* Marks an instance with a value that may be correct
* @var integer
*/
const LOW_CONFIDENCE = 0;
/**
* The confidence about the correctness of the value
*
* One of VERY_HIGH_CONFIDENCE, HIGH_CONFIDENCE, MEDIUM_CONFIDENCE
* and LOW_CONFIDENCE.
*
* @var integer
*/
private $confidence;
/**
* Returns the guess most likely to be correct from a list of guesses.
*
* If there are multiple guesses with the same, highest confidence, the
* returned guess is any of them.
*
* @param Guess[] $guesses An array of guesses
*
* @return Guess|null The guess with the highest confidence
*/
public static function getBestGuess(array $guesses)
{
$result = null;
$maxConfidence = -1;
foreach ($guesses as $guess) {
if ($maxConfidence < $confidence = $guess->getConfidence()) {
$maxConfidence = $confidence;
$result = $guess;
}
}
return $result;
}
/**
* Constructor.
*
* @param integer $confidence The confidence
*
* @throws InvalidArgumentException if the given value of confidence is unknown
*/
public function __construct($confidence)
{
if (self::VERY_HIGH_CONFIDENCE !== $confidence && self::HIGH_CONFIDENCE !== $confidence &&
self::MEDIUM_CONFIDENCE !== $confidence && self::LOW_CONFIDENCE !== $confidence) {
throw new InvalidArgumentException('The confidence should be one of the constants defined in Guess.');
}
$this->confidence = $confidence;
}
/**
* Returns the confidence that the guessed value is correct.
*
* @return integer One of the constants VERY_HIGH_CONFIDENCE,
* HIGH_CONFIDENCE, MEDIUM_CONFIDENCE and LOW_CONFIDENCE
*/
public function getConfidence()
{
return $this->confidence;
}
}