includes/api/ApiQueryBase.php

   1 <?php
   2
   3 /*
   4  * Created on Sep 7, 2006
   5  *
   6  * API for MediaWiki 1.8+
   7  *
   8  * Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License along
  21  * with this program; if not, write to the Free Software Foundation, Inc.,
  22  * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  23  * http://www.gnu.org/copyleft/gpl.html
  24  */
  25
  26 if (!defined('MEDIAWIKI')) {
  27         // Eclipse helper - will be ignored in production
  28         require_once ('ApiBase.php');
  29 }
  30
  31 /**
  32  * This is a base class for all Query modules.
  33  * It provides some common functionality such as constructing various SQL queries.
  34  *
  35  * @addtogroup API
  36  */
  37 abstract class ApiQueryBase extends ApiBase {
  38
  39         private $mQueryModule, $mDb, $tables, $where, $fields, $options;
  40
  41         public function __construct($query, $moduleName, $paramPrefix = '') {
  42                 parent :: __construct($query->getMain(), $moduleName, $paramPrefix);
  43                 $this->mQueryModule = $query;
  44                 $this->mDb = null;
  45                 $this->resetQueryParams();
  46         }
  47
  48         protected function resetQueryParams() {
  49                 $this->tables = array ();
  50                 $this->where = array ();
  51                 $this->fields = array ();
  52                 $this->options = array ();
  53         }
  54
  55         protected function addTables($value) {
  56                 if (is_array($value))
  57                         $this->tables = array_merge($this->tables, $value);
  58                 else
  59                         $this->tables[] = $value;
  60         }
  61
  62         protected function addFields($value) {
  63                 if (is_array($value))
  64                         $this->fields = array_merge($this->fields, $value);
  65                 else
  66                         $this->fields[] = $value;
  67         }
  68
  69         protected function addFieldsIf($value, $condition) {
  70                 if ($condition) {
  71                         $this->addFields($value);
  72                         return true;
  73                 }
  74                 return false;
  75         }
  76
  77         protected function addWhere($value) {
  78                 if (is_array($value))
  79                         $this->where = array_merge($this->where, $value);
  80                 else
  81                         $this->where[] = $value;
  82         }
  83
  84         protected function addWhereIf($value, $condition) {
  85                 if ($condition) {
  86                         $this->addWhere($value);
  87                         return true;
  88                 }
  89                 return false;
  90         }
  91
  92         protected function addWhereFld($field, $value) {
  93                 if (!is_null($value))
  94                         $this->where[$field] = $value;
  95         }
  96
  97         protected function addWhereRange($field, $dir, $start, $end) {
  98                 $isDirNewer = ($dir === 'newer');
  99                 $after = ($isDirNewer ? '>=' : '<=');
 100                 $before = ($isDirNewer ? '<=' : '>=');
 101                 $db = $this->getDB();
 102
 103                 if (!is_null($start))
 104                         $this->addWhere($field . $after . $db->addQuotes($start));
 105
 106                 if (!is_null($end))
 107                         $this->addWhere($field . $before . $db->addQuotes($end));
 108
 109                 $this->addOption('ORDER BY', $field . ($isDirNewer ? '' : ' DESC'));
 110         }
 111
 112         protected function addOption($name, $value = null) {
 113                 if (is_null($value))
 114                         $this->options[] = $name;
 115                 else
 116                         $this->options[$name] = $value;
 117         }
 118
 119         protected function select($method) {
 120
 121                 // getDB has its own profileDBIn/Out calls
 122                 $db = $this->getDB();
 123
 124                 $this->profileDBIn();
 125                 $res = $db->select($this->tables, $this->fields, $this->where, $method, $this->options);
 126                 $this->profileDBOut();
 127
 128                 return $res;
 129         }
 130
 131         public static function addTitleInfo(&$arr, $title, $prefix='') {
 132                 $arr[$prefix . 'ns'] = intval($title->getNamespace());
 133                 $arr[$prefix . 'title'] = $title->getPrefixedText();
 134         }
 135
 136         /**
 137          * Override this method to request extra fields from the pageSet
 138          * using $pageSet->requestField('fieldName')
 139          */
 140         public function requestExtraData($pageSet) {
 141         }
 142
 143         /**
 144          * Get the main Query module
 145          */
 146         public function getQuery() {
 147                 return $this->mQueryModule;
 148         }
 149
 150         /**
 151          * Add sub-element under the page element with the given pageId.
 152          */
 153         protected function addPageSubItems($pageId, $data) {
 154                 $result = $this->getResult();
 155                 $result->setIndexedTagName($data, $this->getModulePrefix());
 156                 $result->addValue(array ('query', 'pages', intval($pageId)),
 157                         $this->getModuleName(),
 158                         $data);
 159         }
 160
 161         protected function setContinueEnumParameter($paramName, $paramValue) {
 162
 163                 $msg = array( $this->encodeParamName($paramName) => $paramValue );
 164                 $this->getResult()->addValue('query-continue', $this->getModuleName(), $msg);
 165         }
 166
 167         /**
 168          * Get the Query database connection (readonly)
 169          */
 170         protected function getDB() {
 171                 if (is_null($this->mDb))
 172                         $this->mDb = $this->getQuery()->getDB();
 173                 return $this->mDb;
 174         }
 175
 176         /**
 177          * Selects the query database connection with the given name.
 178          * If no such connection has been requested before, it will be created.
 179          * Subsequent calls with the same $name will return the same connection
 180          * as the first, regardless of $db or $groups new values.
 181          */
 182         public function selectNamedDB($name, $db, $groups) {
 183                 $this->mDb = $this->getQuery()->getNamedDB($name, $db, $groups);
 184         }
 185
 186         /**
 187          * Get the PageSet object to work on
 188          * @return ApiPageSet data
 189          */
 190         protected function getPageSet() {
 191                 return $this->getQuery()->getPageSet();
 192         }
 193
 194         /**
 195          * This is a very simplistic utility function
 196          * to convert a non-namespaced title string to a db key.
 197          * It will replace all ' ' with '_'
 198          */
 199         public static function titleToKey($title) {
 200                 return str_replace(' ', '_', $title);
 201         }
 202
 203         public static function keyToTitle($key) {
 204                 return str_replace('_', ' ', $key);
 205         }
 206
 207         public static function getBaseVersion() {
 208                 return __CLASS__ . ': $Id$';
 209         }
 210 }
 211
 212 /**
 213  * @addtogroup API
 214  */
 215 abstract class ApiQueryGeneratorBase extends ApiQueryBase {
 216
 217         private $mIsGenerator;
 218
 219         public function __construct($query, $moduleName, $paramPrefix = '') {
 220                 parent :: __construct($query, $moduleName, $paramPrefix);
 221                 $this->mIsGenerator = false;
 222         }
 223
 224         public function setGeneratorMode() {
 225                 $this->mIsGenerator = true;
 226         }
 227
 228         /**
 229          * Overrides base class to prepend 'g' to every generator parameter
 230          */
 231         public function encodeParamName($paramName) {
 232                 if ($this->mIsGenerator)
 233                         return 'g' . parent :: encodeParamName($paramName);
 234                 else
 235                         return parent :: encodeParamName($paramName);
 236         }
 237
 238         /**
 239          * Execute this module as a generator
 240          * @param $resultPageSet PageSet: All output should be appended to this object
 241          */
 242         public abstract function executeGenerator($resultPageSet);
 243 }
 244