Proyectos de Subversion Moodle

<?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/>.

/**

 * @package    tool_xmldb

 * @copyright  2003 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

/**

 * This class will will move one index up/down

 *

 * @package    tool_xmldb

 * @copyright  2003 onwards Eloy Lafuente (stronk7) {@link http://stronk7.com}

 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class move_updown_index extends XMLDBAction {

    /**

     * Init method, every subclass will have its own

     */

    function init() {

        parent::init();

        // Set own custom attributes

        // Get needed strings

        $this->loadStrings(array(

            // 'key' => 'module',

        ));

    }

    /**

     * Invoke method, every class will have its own

     * returns true/false on completion, setting both

     * errormsg and output as necessary

     */

    function invoke() {

        parent::invoke();

        $result = true;

        // Set own core attributes

        $this->does_generate = ACTION_NONE;

        //$this->does_generate = ACTION_GENERATE_HTML;

        // These are always here

        global $CFG, $XMLDB;

        // Do the job, setting result as needed

        // Get the dir containing the file

        $dirpath = required_param('dir', PARAM_PATH);

        $dirpath = $CFG->dirroot . $dirpath;

        // Get the correct dirs

        if (!empty($XMLDB->dbdirs)) {

            $dbdir = $XMLDB->dbdirs[$dirpath];

        } else {

            return false;

        }

        if (!empty($XMLDB->editeddirs)) {

            $editeddir = $XMLDB->editeddirs[$dirpath];

            $structure = $editeddir->xml_file->getStructure();

        }

        $prev = NULL;

        $next = NULL;

        $tableparam = required_param('table', PARAM_CLEAN);

        $indexparam = required_param('index', PARAM_CLEAN);

        $direction  = required_param('direction', PARAM_ALPHA);

        $tables = $structure->getTables();

        $table = $structure->getTable($tableparam);

        $indexes = $table->getIndexes();

        if ($direction == 'down') {

            $index = $table->getIndex($indexparam);

            $swap  = $table->getIndex($index->getNext());

        } else {

            $swap  = $table->getIndex($indexparam);

            $index = $table->getIndex($swap->getPrevious());

        }

        // Change the index before the pair

        if ($index->getPrevious()) {

            $prev = $table->getIndex($index->getPrevious());

            $prev->setNext($swap->getName());

            $swap->setPrevious($prev->getName());

            $prev->setChanged(true);

        } else {

            $swap->setPrevious(NULL);

        }

        // Change the field after the pair

        if ($swap->getNext()) {

            $next = $table->getIndex($swap->getNext());

            $next->setPrevious($index->getName());

            $index->setNext($next->getName());

            $next->setChanged(true);

        } else {

            $index->setNext(NULL);

        }

        // Swap the indexes

        $index->setPrevious($swap->getName());

        $swap->setNext($index->getName());

        // Mark indexes as changed

        $index->setChanged(true);

        $swap->setChanged(true);

        // Table has changed

        $table->setChanged(true);

        // Reorder the indexes

        $table->orderIndexes();

        // Recalculate the hash

        $structure->calculateHash(true);

        // If the hash has changed from the original one, change the version

        // and mark the structure as changed

        $origstructure = $dbdir->xml_file->getStructure();

        if ($structure->getHash() != $origstructure->getHash()) {

            $structure->setVersion(userdate(time(), '%Y%m%d', 99, false));

            $structure->setChanged(true);

        }

        // Launch postaction if exists (leave this here!)

        if ($this->getPostAction() && $result) {

            return $this->launch($this->getPostAction());

        }

        // Return ok if arrived here

        return $result;

    }

}