AbstractFrontend.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\Backend\AbstractBackend;
use TYPO3\CMS\Core\Cache\Backend\BackendInterface;
use TYPO3\CMS\Core\Cache\Backend\TaggableBackendInterface;
use TYPO3\CMS\Core\Utility\GeneralUtility;

abstract class AbstractFrontend implements FrontendInterface
{
    protected $identifier;

    protected $backend;

    public function __construct($identifier, BackendInterface $backend)
    {
        if (preg_match(self::PATTERN_ENTRYIDENTIFIER, $identifier) !== 1) {
            throw new \InvalidArgumentException('"' . $identifier . '" is not a valid cache identifier.', 1203584729);
        }
        $this->identifier = $identifier;
        $this->backend = $backend;
        $this->backend->setCache($this);
    }

    public function getIdentifier()
    {
        return $this->identifier;
    }

    public function getBackend()
    {
        return $this->backend;
    }

    public function has($entryIdentifier)
    {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233058486);
        }
        return $this->backend->has($entryIdentifier);
    }

    public function remove($entryIdentifier)
    {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233058495);
        }
        return $this->backend->remove($entryIdentifier);
    }

    public function flush()
    {
        $this->backend->flush();
    }

    public function flushByTags(array $tags)
    {
        foreach ($tags as $tag) {
            if (!$this->isValidTag($tag)) {
                throw new \InvalidArgumentException('"' . $tag . '" is not a valid tag for a cache entry.', 1233057360);
            }
        }
        if ($this->backend instanceof TaggableBackendInterface) {
            $this->backend->flushByTags($tags);
        }
    }

    public function flushByTag($tag)
    {
        if (!$this->isValidTag($tag)) {
            throw new \InvalidArgumentException('"' . $tag . '" is not a valid tag for a cache entry.', 1233057359);
        }
        if (is_array($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/cache/frontend/class.t3lib_cache_frontend_abstractfrontend.php']['flushByTag'])) {
            foreach ($GLOBALS['TYPO3_CONF_VARS']['SC_OPTIONS']['t3lib/cache/frontend/class.t3lib_cache_frontend_abstractfrontend.php']['flushByTag'] as $_funcRef) {
                $params = ['tag' => $tag];
                GeneralUtility::callUserFunction($_funcRef, $params, $this);
            }
        }
        if ($this->backend instanceof TaggableBackendInterface) {
            $this->backend->flushByTag($tag);
        }
    }

    public function collectGarbage()
    {
        $this->backend->collectGarbage();
    }

    public function isValidEntryIdentifier($identifier)
    {
        return preg_match(self::PATTERN_ENTRYIDENTIFIER, $identifier) === 1;
    }

    public function isValidTag($tag)
    {
        if (!is_array($tag)) {
            return preg_match(self::PATTERN_TAG, $tag) === 1;
        }
        foreach ($tag as $tagValue) {
            if (!$this->isValidTag($tagValue)) {
                return false;
            }
        }
        return true;
    }
}