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<?php
/**
 * Object_Freezer
 *
 * Copyright (c) 2008-2011, Sebastian Bergmann <sb@sebastian-bergmann.de>.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   * Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in
 *     the documentation and/or other materials provided with the
 *     distribution.
 *
 *   * Neither the name of Sebastian Bergmann nor the names of his
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * 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.
 *
 * @package    Object_Freezer
 * @author     Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @copyright  2008-2011 Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @since      File available since Release 1.0.0
 */

require_once 'Object/Freezer.php';
require_once 'Object/Freezer/Cache.php';
require_once 'Object/Freezer/LazyProxy.php';

/**
 * Abstract base class for object storage implementations.
 *
 * @package    Object_Freezer
 * @author     Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @copyright  2008-2011 Sebastian Bergmann <sb@sebastian-bergmann.de>
 * @license    http://www.opensource.org/licenses/bsd-license.php  BSD License
 * @version    Release: 1.0.0
 * @link       http://github.com/sebastianbergmann/php-object-freezer/
 * @since      Class available since Release 1.0.0
 */
abstract class Object_Freezer_Storage
{
    /**
     * @var Object_Freezer_Cache
     */
    protected $cache;

    /**
     * @var Object_Freezer
     */
    protected $freezer;

    /**
     * @var boolean
     */
    protected $lazyLoad = FALSE;

    /**
     * Constructor.
     *
     * @param  Object_Freezer       $freezer
     *                              Object_Freezer instance to be used
     * @param  Object_Freezer_Cache $cache
     *                              Object_Freezer_Cache instance to be used
     * @param  boolean              $useLazyLoad
     *                              Flag that controls whether objects are
     *                              fetched using lazy load or not
     */
    public function __construct(Object_Freezer $freezer = NULL, Object_Freezer_Cache $cache = NULL, $useLazyLoad = FALSE)
    {
        if ($freezer === NULL) {
            $freezer = new Object_Freezer;
        }

        if ($cache === NULL) {
            $cache = new Object_Freezer_Cache;
        }

        $this->freezer = $freezer;
        $this->cache   = $cache;

        $this->setUseLazyLoad($useLazyLoad);
    }

    /**
     * Sets the flag that controls whether objects are fetched using lazy load.
     *
     * @param  boolean $flag
     * @throws InvalidArgumentException
     */
    public function setUseLazyLoad($flag)
    {
        // Bail out if a non-boolean was passed.
        if (!is_bool($flag)) {
            throw Object_Freezer_Util::getInvalidArgumentException(
              1, 'boolean'
            );
        }

        $this->lazyLoad = $flag;
    }

    /**
     * Freezes an object and stores it in the object storage.
     *
     * @param  object $object The object that is to be stored.
     * @return string
     */
    public function store($object)
    {
        // Bail out if a non-object was passed.
        if (!is_object($object)) {
            throw Object_Freezer_Util::getInvalidArgumentException(1, 'object');
        }

        $this->doStore($this->freezer->freeze($object));

        return $object->__php_object_freezer_uuid;
    }

    /**
     * Fetches a frozen object from the object storage and thaws it.
     *
     * @param  string $id The ID of the object that is to be fetched.
     * @return object
     */
    public function fetch($id)
    {
        // Bail out if a non-string was passed.
        if (!is_string($id)) {
            throw Object_Freezer_Util::getInvalidArgumentException(1, 'string');
        }

        // Try to retrieve object from the object cache.
        $object = $this->cache->get($id);

        if (!$object) {
            // Retrieve object from the object storage.
            $frozenObject = $this->doFetch($id);
            $this->fetchArray($frozenObject['objects'][$id]['state']);
            $object = $this->freezer->thaw($frozenObject);

            // Put object into the object cache.
            $this->cache->put($id, $object);
        }

        return $object;
    }

    /**
     * Fetches a frozen array from the object storage and thaws it.
     *
     * @param array $array
     * @param array $objects
     */
    protected function fetchArray(array &$array, array &$objects = array())
    {
        foreach ($array as &$value) {
            if (is_array($value)) {
                $this->fetchArray($value, $objects);
            }

            else if (is_string($value) &&
                     strpos($value, '__php_object_freezer_') === 0) {
                $uuid = str_replace('__php_object_freezer_', '', $value);

                if (!$this->lazyLoad) {
                    $this->doFetch($uuid, $objects);
                } else {
                    $value = new Object_Freezer_LazyProxy($this, $uuid);
                }
            }
        }
    }

    /**
     * Freezes an object and stores it in the object storage.
     *
     * @param array $frozenObject
     */
    abstract protected function doStore(array $frozenObject);

    /**
     * Fetches a frozen object from the object storage and thaws it.
     *
     * @param  string $id The ID of the object that is to be fetched.
     * @return object
     */
    abstract protected function doFetch($id);
}