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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Abstract binary indicator.
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*
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* @package core_analytics
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* @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace core_analytics\local\indicator;
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defined('MOODLE_INTERNAL') || die();
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/**
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* Abstract binary indicator.
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*
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* @package core_analytics
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* @copyright 2017 David Monllao {@link http://www.davidmonllao.com}
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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abstract class binary extends discrete {
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/**
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* get_classes
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*
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* @return array
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*/
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final public static function get_classes() {
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return [-1, 1];
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}
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/**
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* It should always be displayed.
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*
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* Binary values have no subtypes by default, please overwrite if
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* your indicator is adding extra features.
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*
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* @param float $value
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* @param string $subtype
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* @return bool
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*/
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public function should_be_displayed($value, $subtype) {
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if ($subtype != false) {
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return false;
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}
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return true;
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}
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/**
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* get_display_value
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*
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* @param float $value
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* @param string $subtype
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* @return string
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*/
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public function get_display_value($value, $subtype = false) {
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// No subtypes for binary values by default.
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if ($value == -1) {
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return get_string('no');
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} else if ($value == 1) {
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return get_string('yes');
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} else {
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throw new \moodle_exception('errorpredictionformat', 'analytics');
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}
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}
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/**
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* get_calculation_outcome
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*
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* @param float $value
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* @param string $subtype
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* @return int
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*/
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public function get_calculation_outcome($value, $subtype = false) {
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// No subtypes for binary values by default.
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if ($value == -1) {
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return self::OUTCOME_NEGATIVE;
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} else if ($value == 1) {
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return self::OUTCOME_OK;
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} else {
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throw new \moodle_exception('errorpredictionformat', 'analytics');
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}
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}
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/**
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* get_feature_headers
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*
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* @return array
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*/
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public static function get_feature_headers() {
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// Just 1 single feature obtained from the calculated value.
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return array('\\' . get_called_class());
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}
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/**
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* to_features
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*
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* @param array $calculatedvalues
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* @return array
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*/
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protected function to_features($calculatedvalues) {
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// Indicators with binary values have only 1 feature for indicator, here we do nothing else
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// than converting each sample scalar value to an array of scalars with 1 element.
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array_walk($calculatedvalues, function(&$calculatedvalue) {
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// Just return it as an array.
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$calculatedvalue = array($calculatedvalue);
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});
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return $calculatedvalues;
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}
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}
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