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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/>.
/**
* Abstract binary indicator.
*
* @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\indicator;
defined('MOODLE_INTERNAL') || die();
/**
* Abstract binary indicator.
*
* @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 binary extends discrete {
/**
* get_classes
*
* @return array
*/
public static final function get_classes() {
return [-1, 1];
}
/**
* It should always be displayed.
*
* Binary values have no subtypes by default, please overwrite if
* your indicator is adding extra features.
*
* @param float $value
* @param string $subtype
* @return bool
*/
public function should_be_displayed($value, $subtype) {
if ($subtype != false) {
return false;
}
return true;
}
/**
* get_display_value
*
* @param float $value
* @param string $subtype
* @return string
*/
public function get_display_value($value, $subtype = false) {
// No subtypes for binary values by default.
if ($value == -1) {
return get_string('no');
} else if ($value == 1) {
return get_string('yes');
} else {
throw new \moodle_exception('errorpredictionformat', 'analytics');
}
}
/**
* get_calculation_outcome
*
* @param float $value
* @param string $subtype
* @return int
*/
public function get_calculation_outcome($value, $subtype = false) {
// No subtypes for binary values by default.
if ($value == -1) {
return self::OUTCOME_NEGATIVE;
} else if ($value == 1) {
return self::OUTCOME_OK;
} else {
throw new \moodle_exception('errorpredictionformat', 'analytics');
}
}
/**
* get_feature_headers
*
* @return array
*/
public static function get_feature_headers() {
// Just 1 single feature obtained from the calculated value.
return array('\\' . get_called_class());
}
/**
* to_features
*
* @param array $calculatedvalues
* @return array
*/
protected function to_features($calculatedvalues) {
// Indicators with binary values have only 1 feature for indicator, here we do nothing else
// than converting each sample scalar value to an array of scalars with 1 element.
array_walk($calculatedvalues, function(&$calculatedvalue) {
// Just return it as an array.
$calculatedvalue = array($calculatedvalue);
});
return $calculatedvalues;
}
}