StringFrontend.php

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<?php
namespace TYPO3\CMS\Core\Cache\Frontend;

/*
 * 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!
 */

use TYPO3\CMS\Core\Cache\Exception\InvalidDataException;

class StringFrontend extends AbstractFrontend
{
    public function set($entryIdentifier, $string, array $tags = [], $lifetime = null)
    {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233057566);
        }
        if (!is_string($string)) {
            throw new InvalidDataException('Given data is of type "' . gettype($string) . '", but a string is expected for string cache.', 1222808333);
        }
        foreach ($tags as $tag) {
            if (!$this->isValidTag($tag)) {
                throw new \InvalidArgumentException('"' . $tag . '" is not a valid tag for a cache entry.', 1233057512);
            }
        }
        $this->backend->set($entryIdentifier, $string, $tags, $lifetime);
    }

    public function get($entryIdentifier)
    {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233057752);
        }
        return $this->backend->get($entryIdentifier);
    }

    public function getByTag($tag)
    {
        if (!$this->isValidTag($tag)) {
            throw new \InvalidArgumentException('"' . $tag . '" is not a valid tag for a cache entry.', 1233057772);
        }
        $entries = [];
        $identifiers = $this->backend->findIdentifiersByTag($tag);
        foreach ($identifiers as $identifier) {
            $entries[] = $this->backend->get($identifier);
        }
        return $entries;
    }
}