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   1  <?php // $Id: move_updown_index.class.php,v 1.4 2007/10/10 05:25:17 nicolasconnault Exp $
   2  
   3  ///////////////////////////////////////////////////////////////////////////
   4  //                                                                       //
   5  // NOTICE OF COPYRIGHT                                                   //
   6  //                                                                       //
   7  // Moodle - Modular Object-Oriented Dynamic Learning Environment         //
   8  //          http://moodle.com                                            //
   9  //                                                                       //
  10  // Copyright (C) 1999 onwards Martin Dougiamas        http://dougiamas.com  //
  11  //           (C) 2001-3001 Eloy Lafuente (stronk7) http://contiento.com  //
  12  //                                                                       //
  13  // This program is free software; you can redistribute it and/or modify  //
  14  // it under the terms of the GNU General Public License as published by  //
  15  // the Free Software Foundation; either version 2 of the License, or     //
  16  // (at your option) any later version.                                   //
  17  //                                                                       //
  18  // This program is distributed in the hope that it will be useful,       //
  19  // but WITHOUT ANY WARRANTY; without even the implied warranty of        //
  20  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         //
  21  // GNU General Public License for more details:                          //
  22  //                                                                       //
  23  //          http://www.gnu.org/copyleft/gpl.html                         //
  24  //                                                                       //
  25  ///////////////////////////////////////////////////////////////////////////
  26  
  27  /// This class will will move one index up/down
  28  
  29  class move_updown_index extends XMLDBAction {
  30  
  31      /**
  32       * Init method, every subclass will have its own
  33       */
  34      function init() {
  35          parent::init();
  36  
  37      /// Set own custom attributes
  38  
  39      /// Get needed strings
  40          $this->loadStrings(array(
  41          /// 'key' => 'module',
  42          ));
  43      }
  44  
  45      /**
  46       * Invoke method, every class will have its own
  47       * returns true/false on completion, setting both
  48       * errormsg and output as necessary
  49       */
  50      function invoke() {
  51          parent::invoke();
  52  
  53          $result = true;
  54  
  55      /// Set own core attributes
  56          $this->does_generate = ACTION_NONE;
  57          //$this->does_generate = ACTION_GENERATE_HTML;
  58  
  59      /// These are always here
  60          global $CFG, $XMLDB;
  61  
  62      /// Do the job, setting result as needed
  63      /// Get the dir containing the file
  64          $dirpath = required_param('dir', PARAM_PATH);
  65          $dirpath = $CFG->dirroot . stripslashes_safe($dirpath);
  66  
  67      /// Get the correct dirs
  68          if (!empty($XMLDB->dbdirs)) {
  69              $dbdir =& $XMLDB->dbdirs[$dirpath];
  70          } else {
  71              return false;
  72          }
  73          if (!empty($XMLDB->editeddirs)) {
  74              $editeddir =& $XMLDB->editeddirs[$dirpath];
  75              $structure =& $editeddir->xml_file->getStructure();
  76          }
  77      /// ADD YOUR CODE HERE
  78          $prev = NULL;
  79          $next = NULL;
  80          $tableparam = required_param('table', PARAM_CLEAN);
  81          $indexparam = required_param('index', PARAM_CLEAN);
  82          $direction  = required_param('direction', PARAM_ALPHA);
  83          $tables =& $structure->getTables();
  84          $table =& $structure->getTable($tableparam);
  85          $indexes =& $table->getIndexes();
  86          if ($direction == 'down') {
  87              $index =& $table->getIndex($indexparam);
  88              $swap  =& $table->getIndex($index->getNext());
  89          } else {
  90              $swap  =& $table->getIndex($indexparam);
  91              $index =& $table->getIndex($swap->getPrevious());
  92          }
  93  
  94      /// Change the index before the pair
  95          if ($index->getPrevious()) {
  96              $prev =& $table->getIndex($index->getPrevious());
  97              $prev->setNext($swap->getName());
  98              $swap->setPrevious($prev->getName());
  99              $prev->setChanged(true);
 100          } else {
 101              $swap->setPrevious(NULL);
 102          }
 103      /// Change the field after the pair
 104          if ($swap->getNext()) {
 105              $next =& $table->getIndex($swap->getNext());
 106              $next->setPrevious($index->getName());
 107              $index->setNext($next->getName());
 108              $next->setChanged(true);
 109          } else {
 110              $index->setNext(NULL);
 111          }
 112      /// Swap the indexes
 113          $index->setPrevious($swap->getName());
 114          $swap->setNext($index->getName());
 115  
 116      /// Mark indexes as changed
 117          $index->setChanged(true);
 118          $swap->setChanged(true);
 119  
 120      /// Table has changed
 121          $table->setChanged(true);
 122  
 123      /// Reorder the indexes
 124          $table->orderIndexes($indexes);
 125  
 126      /// Recalculate the hash
 127          $structure->calculateHash(true);
 128  
 129      /// If the hash has changed from the original one, change the version
 130      /// and mark the structure as changed
 131          $origstructure =& $dbdir->xml_file->getStructure();
 132          if ($structure->getHash() != $origstructure->getHash()) {
 133              $structure->setVersion(userdate(time(), '%Y%m%d', 99, false));
 134              $structure->setChanged(true);
 135          }
 136  
 137      /// Launch postaction if exists (leave this here!)
 138          if ($this->getPostAction() && $result) {
 139              return $this->launch($this->getPostAction());
 140          }
 141  
 142      /// Return ok if arrived here
 143          return $result;
 144      }
 145  }
 146  ?>