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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/>. /** * Applies the same callback to all recorset records. * * @since Moodle 2.9 * @package core * @category dml * @copyright 2015 David Monllao * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ namespace core\dml; defined('MOODLE_INTERNAL') || die(); /** * Iterator that walks through a moodle_recordset applying the provided function. * * The internal recordset can be closed using the close() function. * * Note that consumers of this class are responsible of closing the recordset, * although there are some implicit closes under some ciscumstances: * - Once all recordset records have been iterated * - The object is destroyed * * @since Moodle 2.9 * @package core * @category dml * @copyright 2015 David Monllao * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later */ class recordset_walk implements \Iterator { /** * @var \moodle_recordset The recordset. */ protected $recordset; /** * @var callable The callback. */ protected $callback; /** * @var mixed|null Extra param for the callback. */ protected $callbackextra; /** * Create a new iterator applying the callback to each record. * * @param \moodle_recordset $recordset Recordset to iterate. * @param callable $callback Apply this function to each record. If using a method, it should be public. * @param mixed $callbackextra An extra single parameter to pass to the callback. Use a container to pass multiple values. */ public function __construct(\moodle_recordset $recordset, callable $callback, $callbackextra = null) { $this->recordset = $recordset; $this->callback = $callback; $this->callbackextra = $callbackextra; } /** * Closes the recordset. * * @return void */ public function __destruct() { $this->close(); } /** * Returns the current element after applying the callback. * * @return mixed|bool The returned value type will depend on the callback. */ public function current() { if (!$this->recordset->valid()) { return false; } if (!$record = $this->recordset->current()) { return false; } // Apply callback and return. if (!is_null($this->callbackextra)) { return call_user_func($this->callback, $record, $this->callbackextra); } else { return call_user_func($this->callback, $record); } } /** * Moves the internal pointer to the next record. * * @return void */ public function next() { return $this->recordset->next(); } /** * Returns current record key. * * @return int */ public function key() { return $this->recordset->key(); } /** * Returns whether the current position is valid or not. * * If we reached the end of the recordset we close as we * don't allow rewinds. Doing do so we reduce the chance * of unclosed recordsets. * * @return bool */ public function valid() { if (!$valid = $this->recordset->valid()) { $this->close(); } return $valid; } /** * Rewind is not supported. * * @return void */ public function rewind() { // No rewind as it is not implemented in moodle_recordset. return; } /** * Closes the recordset. * * @return void */ public function close() { $this->recordset->close(); } }