public function publish($pks = null, $state = 1, $userId = 0)
	{
		// Initialise variables.
		$k = $this->_tbl_key;

		// Sanitize input.
		\Hubzero\Utility\Arr::toInteger($pks);
		$userId = (int) $userId;
		$state = (int) $state;

		// If there are no primary keys set check to see if the instance key is set.
		if (empty($pks))
		{
			if ($this->$k)
			{
				$pks = array($this->$k);
			}
			// Nothing to set publishing state on, return false.
			else
			{
				$e = new Exception(Lang::txt('JLIB_DATABASE_ERROR_NO_ROWS_SELECTED'));
				$this->setError($e);

				return false;
			}
		}

		// Update the publishing state for rows with the given primary keys.
		$query = $this->_db->getQuery();
		$query->update($this->_tbl);
		$query->set(array('published' => (int) $state));

		// Determine if there is checkin support for the table.
		if (property_exists($this, 'checked_out') || property_exists($this, 'checked_out_time'))
		{
			$query->whereEquals('checked_out', 0, 1)
				->orWhereEquals('checked_out', (int) $userId, 1)
				->resetDepth();
			$checkin = true;
		}
		else
		{
			$checkin = false;
		}

		// Build the WHERE clause for the primary keys.
		$query->whereRaw($k . ' = ' . implode(' OR ' . $k . ' = ', $pks));

		$this->_db->setQuery($query->toString());

		// Check for a database error.
		if (!$this->_db->execute())
		{
			$e = new Exception(Lang::txt('JLIB_DATABASE_ERROR_PUBLISH_FAILED', get_class($this), $this->_db->getErrorMsg()));
			$this->setError($e);

			return false;
		}

		// If checkin is supported and all rows were adjusted, check them in.
		if ($checkin && (count($pks) == $this->_db->getAffectedRows()))
		{
			// Checkin the rows.
			foreach ($pks as $pk)
			{
				$this->checkin($pk);
			}
		}

		// If the Table instance value is in the list of primary keys that were set, set the instance.
		if (in_array($this->$k, $pks))
		{
			$this->published = $state;
		}

		$this->setError('');
		return true;
	}