KnpLabs / Gaufrette

     *

     * @return string

     */

    public function read($key)

    {

        self::assertValidKey($key);

        $this->assertHasFile($key);

        $content = $this->adapter->read($key);

        if (false === $content) {

            throw new \RuntimeException(sprintf('Could not read the "%s" key content.', $key));

        }

        return $content;

    }

    /**

     * Deletes the file matching the specified key.

     *

     * @return bool

     */

    public function delete($key)

    {

        self::assertValidKey($key);

        $this->assertHasFile($key);

        if ($this->adapter->delete($key)) {

            $this->removeFromRegister($key);

            return true;

        }

        throw new \RuntimeException(sprintf('Could not remove the "%s" key.', $key));

    }

    /**

     * Returns an array of all keys.