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Filename : messages.php
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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_messages
 *
 * @copyright   Copyright (C) 2005 - 2016 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

defined('_JEXEC') or die;

/**
 * Messages Component Messages Model
 *
 * @since  1.6
 */
class MessagesModelMessages extends JModelList
{
	/**
	 * Constructor.
	 *
	 * @param   array  $config  An optional associative array of configuration settings.
	 *
	 * @see     JController
	 * @since   1.6
	 */
	public function __construct($config = array())
	{
		if (empty($config['filter_fields']))
		{
			$config['filter_fields'] = array(
				'message_id', 'a.id',
				'subject', 'a.subject',
				'state', 'a.state',
				'user_id_from', 'a.user_id_from',
				'user_id_to', 'a.user_id_to',
				'date_time', 'a.date_time',
				'priority', 'a.priority',
			);
		}

		parent::__construct($config);
	}

	/**
	 * Method to auto-populate the model state.
	 *
	 * This method should only be called once per instantiation and is designed
	 * to be called on the first call to the getState() method unless the model
	 * configuration flag to ignore the request is set.
	 *
	 * Note. Calling getState in this method will result in recursion.
	 *
	 * @param   string  $ordering   An optional ordering field.
	 * @param   string  $direction  An optional direction (asc|desc).
	 *
	 * @return  void
	 *
	 * @since   1.6
	 */
	protected function populateState($ordering = null, $direction = null)
	{
		// Load the filter state.
		$search = $this->getUserStateFromRequest($this->context . '.filter.search', 'filter_search');
		$this->setState('filter.search', $search);

		$state = $this->getUserStateFromRequest($this->context . '.filter.state', 'filter_state', '', 'string');
		$this->setState('filter.state', $state);

		// List state information.
		parent::populateState('a.date_time', 'desc');
	}

	/**
	 * Method to get a store id based on model configuration state.
	 *
	 * This is necessary because the model is used by the component and
	 * different modules that might need different sets of data or different
	 * ordering requirements.
	 *
	 * @param   string  $id  A prefix for the store id.
	 *
	 * @return  string    A store id.
	 *
	 * @since   1.6
	 */
	protected function getStoreId($id = '')
	{
		// Compile the store id.
		$id .= ':' . $this->getState('filter.search');
		$id .= ':' . $this->getState('filter.state');

		return parent::getStoreId($id);
	}

	/**
	 * Build an SQL query to load the list data.
	 *
	 * @return  JDatabaseQuery
	 *
	 * @since   1.6
	 */
	protected function getListQuery()
	{
		// Create a new query object.
		$db = $this->getDbo();
		$query = $db->getQuery(true);
		$user = JFactory::getUser();

		// Select the required fields from the table.
		$query->select(
			$this->getState(
				'list.select',
				'a.*, ' .
					'u.name AS user_from'
			)
		);
		$query->from('#__messages AS a');

		// Join over the users for message owner.
		$query->join('INNER', '#__users AS u ON u.id = a.user_id_from')
			->where('a.user_id_to = ' . (int) $user->get('id'));

		// Filter by published state.
		$state = $this->getState('filter.state');

		if (is_numeric($state))
		{
			$query->where('a.state = ' . (int) $state);
		}
		elseif ($state === '')
		{
			$query->where('(a.state IN (0, 1))');
		}

		// Filter by search in subject or message.
		$search = $this->getState('filter.search');

		if (!empty($search))
		{
			$search = $db->quote('%' . str_replace(' ', '%', $db->escape(trim($search), true) . '%'));
			$query->where('a.subject LIKE ' . $search . ' OR a.message LIKE ' . $search);
		}

		// Add the list ordering clause.
		$query->order($db->escape($this->getState('list.ordering', 'a.date_time')) . ' ' . $db->escape($this->getState('list.direction', 'DESC')));

		return $query;
	}
}