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<?php
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Core\Resource\TextExtraction;
use TYPO3\CMS\Core\Resource\FileInterface;
use TYPO3\CMS\Core\SingletonInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;
/**
* Class TextExtractorRegistry
*/
class TextExtractorRegistry implements SingletonInterface
{
/**
* Registered text extractor class names
*
* @var array
*/
protected $textExtractorClasses = [];
/**
* Instance cache for text extractor classes
*
* @var TextExtractorInterface[]
*/
protected $instances = [];
/**
* Allows to register a text extractor class
*
* @param string $className
* @throws \InvalidArgumentException
*/
public function registerTextExtractor($className)
{
if (!class_exists($className)) {
throw new \InvalidArgumentException('The class "' . $className . '" you are trying to register is not available', 1422906893);
}
if (!in_array(TextExtractorInterface::class, class_implements($className) ?: [], true)) {
throw new \InvalidArgumentException($className . ' must implement interface' . TextExtractorInterface::class, 1422771427);
}
$this->textExtractorClasses[] = $className;
}
/**
* Get all registered text extractor instances
*
* @return TextExtractorInterface[]
*/
public function getTextExtractorInstances()
{
if (empty($this->instances) && !empty($this->textExtractorClasses)) {
foreach ($this->textExtractorClasses as $className) {
$object = $this->createTextExtractorInstance($className);
$this->instances[] = $object;
}
}
return $this->instances;
}
/**
* Create an instance of a certain text extractor class
*
* @param string $className
* @return TextExtractorInterface
*/
protected function createTextExtractorInstance($className)
{
return GeneralUtility::makeInstance($className);
}
/**
* Checks whether any registered text extractor can deal with a given file
* and returns it.
*
* @return TextExtractorInterface|null
*/
public function getTextExtractor(FileInterface $file)
{
foreach ($this->getTextExtractorInstances() as $textExtractor) {
if ($textExtractor->canExtractText($file)) {
return $textExtractor;
}
}
return null;
}
}