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   1  <?php
   2  // This file is part of Moodle - http://moodle.org/
   3  //
   4  // Moodle is free software: you can redistribute it and/or modify
   5  // it under the terms of the GNU General Public License as published by
   6  // the Free Software Foundation, either version 3 of the License, or
   7  // (at your option) any later version.
   8  //
   9  // Moodle is distributed in the hope that it will be useful,
  10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  // GNU General Public License for more details.
  13  //
  14  // You should have received a copy of the GNU General Public License
  15  // along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
  16  
  17  declare(strict_types=1);
  18  
  19  namespace core_reportbuilder\local\aggregation;
  20  
  21  use lang_string;
  22  use core_reportbuilder\local\report\column;
  23  
  24  /**
  25   * Column max aggregation type
  26   *
  27   * @package     core_reportbuilder
  28   * @copyright   2021 Paul Holden <paulh@moodle.com>
  29   * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  30   */
  31  class max extends base {
  32  
  33      /**
  34       * Return aggregation name
  35       *
  36       * @return lang_string
  37       */
  38      public static function get_name(): lang_string {
  39          return new lang_string('aggregationmax', 'core_reportbuilder');
  40      }
  41  
  42      /**
  43       * This aggregation can be performed on all numeric/date/boolean types
  44       *
  45       * @param int $columntype
  46       * @return bool
  47       */
  48      public static function compatible(int $columntype): bool {
  49          return in_array($columntype, [
  50              column::TYPE_INTEGER,
  51              column::TYPE_FLOAT,
  52              column::TYPE_TIMESTAMP,
  53              column::TYPE_BOOLEAN,
  54          ]);
  55      }
  56  
  57      /**
  58       * Return the aggregated field SQL
  59       *
  60       * @param string $field
  61       * @param int $columntype
  62       * @return string
  63       */
  64      public static function get_field_sql(string $field, int $columntype): string {
  65          return "MAX({$field})";
  66      }
  67  }