<?php
/*
 *  $Id$
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * This software consists of voluntary contributions made by many individuals
 * and is licensed under the LGPL. For more information, see
 * <http://www.doctrine-project.org>.
 */

namespace Doctrine\Common\Cache;

/**
 * Array cache driver.
 *
 * @license http://www.opensource.org/licenses/lgpl-license.php LGPL
 * @link    www.doctrine-project.org
 * @since   2.0
 * @version $Revision: 3938 $
 * @author  Guilherme Blanco <guilhermeblanco@hotmail.com>
 * @author  Jonathan Wage <jonwage@gmail.com>
 * @author  Roman Borschel <roman@code-factory.org>
 * @author  David Abdemoulaie <dave@hobodave.com>
 */
class ArrayCache extends AbstractCache
{
    /**
     * @var array $data
     */
    private $data = array();

    /**
     * {@inheritdoc}
     */
    public function getIds()
    {
        return array_keys($this->data);
    }

    /**
     * {@inheritdoc}
     */
    protected function _doFetch($id)
    {
        if (isset($this->data[$id])) {
            return $this->data[$id];
        }
        return false;
    }

    /**
     * {@inheritdoc}
     */
    protected function _doContains($id)
    {
        return isset($this->data[$id]);
    }

    /**
     * {@inheritdoc}
     */
    protected function _doSave($id, $data, $lifeTime = 0)
    {
        $this->data[$id] = $data;
        return true;
    }

    /**
     * {@inheritdoc}
     */
    protected function _doDelete($id)
    {
        unset($this->data[$id]);
        return true;
    }
}