StringFrontend.php

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

class StringFrontend extends \TYPO3\CMS\Core\Cache\Frontend\AbstractFrontend {

    public function set($entryIdentifier, $string, array $tags = array(), $lifetime = NULL) {
        if (!$this->isValidEntryIdentifier($entryIdentifier)) {
            throw new \InvalidArgumentException('"' . $entryIdentifier . '" is not a valid cache entry identifier.', 1233057566);
        }
        if (!is_string($string)) {
            throw new \TYPO3\CMS\Core\Cache\Exception\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 = array();
        $identifiers = $this->backend->findIdentifiersByTag($tag);
        foreach ($identifiers as $identifier) {
            $entries[] = $this->backend->get($identifier);
        }
        return $entries;
    }

}