<?php
/**
 * A default news reader class reads news from database layer
 *
 * @author		Roland Haeder <webmaster@shipsimu.org>
 * @version		0.0.0
 * @copyright	Copyright (c) 2007, 2008 Roland Haeder, 2009 - 2012 Core Developer Team
 * @license		GNU GPL 3.0 or any newer version
 * @link		http://www.shipsimu.org
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
class DefaultNewsReader extends BaseFrameworkSystem implements ReadableNews, Registerable {
	/**
	 * Protected constructor
	 *
	 * @return	void
	 */
	protected function __construct () {
		// Call parent constructor
		parent::__construct(__CLASS__);
	}

	/**
	 * Creates an instance of this reader by a provided request instance
	 *
	 * @param	$requestInstance	An instance of a Requestable class
	 * @return	$readerInstance		An instance of this reader class
	 */
	public static final function createDefaultNewsReader (Requestable $requestInstance) {
		// Get a new instance
		$readerInstance = new DefaultNewsReader();

		// Set request instance
		$readerInstance->setRequestInstance($requestInstance);

		// Return prepared instance
		return $readerInstance;
	}

	/**
	 * Initializes this reader class by pre-fetching news depending on 'page'
	 * (outside or login area), which amount of news and how much to skip
	 *
	 * @return	void
	 */
	public function initializeReader () {
		// Get 'page' for saving some calls
		$page = $this->getRequestInstance()->getRequestElement('page');

		// First get a wrapper instance
		$wrapperInstance = ObjectFactory::createObjectByConfiguredName('news_db_wrapper_class');

		// Next create a searchable criteria instance
		$criteriaInstance = ObjectFactory::createObjectByConfiguredName('search_criteria_class');

		// Add the page as criteria to it at lease
		$criteriaInstance->addCriteria('page', $page);

		// Add limitation from config
		$criteriaInstance->setConfiguredLimit('news_' . $page . '_limit');

		// Get a resultInstance back from the database
		$resultInstance = $wrapperInstance->doSelectByCriteria($criteriaInstance);

		// Save that resultInstance in this class
		$this->setResultInstance($resultInstance);
	}
}

// [EOF]
?>