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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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declare(strict_types=1);
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namespace core_reportbuilder\local\aggregation;
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use lang_string;
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use core_reportbuilder\local\report\column;
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/**
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* Column count distinct aggregation type
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*
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* @package core_reportbuilder
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* @copyright 2021 Paul Holden <paulh@moodle.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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class countdistinct extends base {
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/**
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* Return aggregation name
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*
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* @return lang_string
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*/
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public static function get_name(): lang_string {
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return new lang_string('aggregationcountdistinct', 'core_reportbuilder');
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}
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/**
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* This aggregation can be performed on all column types
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*
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* @param int $columntype
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* @return bool
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*/
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public static function compatible(int $columntype): bool {
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return true;
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}
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/**
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* Override base method to ensure all SQL fields are concatenated together if there are multiple
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*
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* @param array $sqlfields
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* @return string
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*/
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public static function get_column_field_sql(array $sqlfields): string {
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if (count($sqlfields) === 1) {
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return parent::get_column_field_sql($sqlfields);
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}
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return self::get_column_fields_concat($sqlfields);
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}
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/**
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* Return the aggregated field SQL
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*
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* @param string $field
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* @param int $columntype
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* @return string
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*/
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public static function get_field_sql(string $field, int $columntype): string {
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global $DB;
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if ($columntype === column::TYPE_LONGTEXT && $DB->get_dbfamily() === 'oracle') {
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$field = $DB->sql_compare_text($field, 255);
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}
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return "COUNT(DISTINCT {$field})";
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}
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/**
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* Return formatted value for column when applying aggregation
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*
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* @param mixed $value
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* @param array $values
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* @param array $callbacks
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* @param int $columntype
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* @return int
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*/
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public static function format_value($value, array $values, array $callbacks, int $columntype): int {
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return (int) reset($values);
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}
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}
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