Indexing file content in TYPO3 6.2 with Solr

Classes_Xclass_DocumentFactory.php

<?php
namespace My\solrfileindexing\Xclass;

use TYPO3\CMS\Core\Utility\GeneralUtility;

/**
 * Requires cc_text* extensions!
 */
class DocumentFactory extends \TYPO3\Solr\Solrfal\Indexing\DocumentFactory {

	/**
	 * @param \Apache_Solr_Document $document
	 * @param \TYPO3\CMS\Core\Resource\File $file
	 * @return void
	 */
	protected function addFileInformation(\Apache_Solr_Document $document, \TYPO3\CMS\Core\Resource\File $file) {
		$document->setField('content', $this->extractContent($file));
		parent::addFileInformation($document, $file);
	}

	/**
	 *
	 *
	 * @param \TYPO3\CMS\Core\Resource\File $file
	 * @return string
	 */
	protected function extractContent(\TYPO3\CMS\Core\Resource\File $file) {
		$fileContent = '';
		$mimeType    = $file->getMimeType();

		if ($mimeType == 'text/plain') {
			// we can read text files directly
			$fileContent = $file->getContents();
		}
		else {
			// other subtypes should be handled by the text service
			$serviceChain = '';
			while (empty($fileContent) && ($service = GeneralUtility::makeInstanceService('textExtract', $file->getExtension(), $serviceChain))) {
				$serviceChain .= ',' . $service->getServiceKey();
				$filePath = $file->getForLocalProcessing(FALSE);
				$service->setInputFile($filePath, $file->getExtension());
				$serviceConfiguration = array('wantedCharset' => 'utf-8');
				$service->process('', '', $serviceConfiguration);

				$fileContent = trim($service->getOutput());
			}
		}

		$contentExtractor = GeneralUtility::makeInstance('Tx_Solr_HtmlContentExtractor', $fileContent);
		/** @var \Tx_Solr_HtmlContentExtractor $contentExtractor */
		return $contentExtractor->getIndexableContent();
	}
}

ext_localconf.php

<?php
$GLOBALS['TYPO3_CONF_VARS']['SYS']['Objects']['TYPO3\\Solr\\Solrfal\\Indexing\\DocumentFactory'] = array(
    'className' => 'My\\solrfileindexing\\Xclass\\DocumentFactory',
);