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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle 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.
//
// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* X parts time splitting method.
*
* @package core_analytics
* @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
namespace core_analytics\local\time_splitting;
defined('MOODLE_INTERNAL') || die();
/**
* X parts time splitting method.
*
* @package core_analytics
* @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
abstract class equal_parts extends base implements before_now {
/**
* Returns the number of parts the analyser duration should be split in.
*
* @return int
*/
abstract protected function get_number_parts();
/**
* Splits the analysable duration in X equal parts from the start to the end.
*
* @return array
*/
protected function define_ranges() {
$nparts = $this->get_number_parts();
$rangeduration = ($this->analysable->get_end() - $this->analysable->get_start()) / $nparts;
if ($rangeduration < $nparts) {
// It is interesting to avoid having a single timestamp belonging to multiple time ranges
// because of things like community of inquiry indicators, where activities have a due date
// that, ideally, would fall only into 1 time range. If the analysable duration is very short
// it is because the model doesn't contain indicators that depend so heavily on time and therefore
// we don't need to worry about timestamps being present in multiple time ranges.
$allowmultipleranges = true;
}
$ranges = array();
for ($i = 0; $i < $nparts; $i++) {
$start = $this->analysable->get_start() + intval($rangeduration * $i);
$end = $this->analysable->get_start() + intval($rangeduration * ($i + 1));
if (empty($allowmultipleranges) && $i > 0 && $start === $ranges[$i - 1]['end']) {
// We add 1 second so each timestamp only belongs to 1 range.
$start = $start + 1;
}
if ($i === ($nparts - 1)) {
// Better to use the end for the last one as we are using floor above.
$end = $this->analysable->get_end();
}
$ranges[$i] = array(
'start' => $start,
'end' => $end,
'time' => $end
);
}
return $ranges;
}
}