includes/api/ApiQueryBase.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 7, 2006
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * This is a base class for all Query modules.
  29  * It provides some common functionality such as constructing various SQL
  30  * queries.
  31  *
  32  * @ingroup API
  33  */
  34 abstract class ApiQueryBase extends ApiBase {
  35
  36         private $mQueryModule, $mDb, $tables, $where, $fields, $options, $join_conds;
  37
  38         /**
  39          * @param ApiQuery $queryModule
  40          * @param string $moduleName
  41          * @param string $paramPrefix
  42          */
  43         public function __construct( ApiQuery $queryModule, $moduleName, $paramPrefix = '' ) {
  44                 parent::__construct( $queryModule->getMain(), $moduleName, $paramPrefix );
  45                 $this->mQueryModule = $queryModule;
  46                 $this->mDb = null;
  47                 $this->resetQueryParams();
  48         }
  49
  50         /************************************************************************//**
  51          * @name   Methods to implement
  52          * @{
  53          */
  54
  55         /**
  56          * Get the cache mode for the data generated by this module. Override
  57          * this in the module subclass. For possible return values and other
  58          * details about cache modes, see ApiMain::setCacheMode()
  59          *
  60          * Public caching will only be allowed if *all* the modules that supply
  61          * data for a given request return a cache mode of public.
  62          *
  63          * @param array $params
  64          * @return string
  65          */
  66         public function getCacheMode( $params ) {
  67                 return 'private';
  68         }
  69
  70         /**
  71          * Override this method to request extra fields from the pageSet
  72          * using $pageSet->requestField('fieldName')
  73          *
  74          * Note this only makes sense for 'prop' modules, as 'list' and 'meta'
  75          * modules should not be using the pageset.
  76          *
  77          * @param ApiPageSet $pageSet
  78          */
  79         public function requestExtraData( $pageSet ) {
  80         }
  81
  82         /**@}*/
  83
  84         /************************************************************************//**
  85          * @name   Data access
  86          * @{
  87          */
  88
  89         /**
  90          * Get the main Query module
  91          * @return ApiQuery
  92          */
  93         public function getQuery() {
  94                 return $this->mQueryModule;
  95         }
  96
  97         /**
  98          * @see ApiBase::getParent()
  99          */
 100         public function getParent() {
 101                 return $this->getQuery();
 102         }
 103
 104         /**
 105          * Get the Query database connection (read-only)
 106          * @return DatabaseBase
 107          */
 108         protected function getDB() {
 109                 if ( is_null( $this->mDb ) ) {
 110                         $this->mDb = $this->getQuery()->getDB();
 111                 }
 112
 113                 return $this->mDb;
 114         }
 115
 116         /**
 117          * Selects the query database connection with the given name.
 118          * See ApiQuery::getNamedDB() for more information
 119          * @param string $name Name to assign to the database connection
 120          * @param int $db One of the DB_* constants
 121          * @param array $groups Query groups
 122          * @return DatabaseBase
 123          */
 124         public function selectNamedDB( $name, $db, $groups ) {
 125                 $this->mDb = $this->getQuery()->getNamedDB( $name, $db, $groups );
 126         }
 127
 128         /**
 129          * Get the PageSet object to work on
 130          * @return ApiPageSet
 131          */
 132         protected function getPageSet() {
 133                 return $this->getQuery()->getPageSet();
 134         }
 135
 136         /**@}*/
 137
 138         /************************************************************************//**
 139          * @name   Querying
 140          * @{
 141          */
 142
 143         /**
 144          * Blank the internal arrays with query parameters
 145          */
 146         protected function resetQueryParams() {
 147                 $this->tables = array();
 148                 $this->where = array();
 149                 $this->fields = array();
 150                 $this->options = array();
 151                 $this->join_conds = array();
 152         }
 153
 154         /**
 155          * Add a set of tables to the internal array
 156          * @param string|string[] $tables Table name or array of table names
 157          * @param string|null $alias Table alias, or null for no alias. Cannot be
 158          *  used with multiple tables
 159          */
 160         protected function addTables( $tables, $alias = null ) {
 161                 if ( is_array( $tables ) ) {
 162                         if ( !is_null( $alias ) ) {
 163                                 ApiBase::dieDebug( __METHOD__, 'Multiple table aliases not supported' );
 164                         }
 165                         $this->tables = array_merge( $this->tables, $tables );
 166                 } else {
 167                         if ( !is_null( $alias ) ) {
 168                                 $this->tables[$alias] = $tables;
 169                         } else {
 170                                 $this->tables[] = $tables;
 171                         }
 172                 }
 173         }
 174
 175         /**
 176          * Add a set of JOIN conditions to the internal array
 177          *
 178          * JOIN conditions are formatted as array( tablename => array(jointype,
 179          * conditions) e.g. array('page' => array('LEFT JOIN',
 180          * 'page_id=rev_page')) . conditions may be a string or an
 181          * addWhere()-style array
 182          * @param array $join_conds JOIN conditions
 183          */
 184         protected function addJoinConds( $join_conds ) {
 185                 if ( !is_array( $join_conds ) ) {
 186                         ApiBase::dieDebug( __METHOD__, 'Join conditions have to be arrays' );
 187                 }
 188                 $this->join_conds = array_merge( $this->join_conds, $join_conds );
 189         }
 190
 191         /**
 192          * Add a set of fields to select to the internal array
 193          * @param array|string $value Field name or array of field names
 194          */
 195         protected function addFields( $value ) {
 196                 if ( is_array( $value ) ) {
 197                         $this->fields = array_merge( $this->fields, $value );
 198                 } else {
 199                         $this->fields[] = $value;
 200                 }
 201         }
 202
 203         /**
 204          * Same as addFields(), but add the fields only if a condition is met
 205          * @param array|string $value See addFields()
 206          * @param bool $condition If false, do nothing
 207          * @return bool $condition
 208          */
 209         protected function addFieldsIf( $value, $condition ) {
 210                 if ( $condition ) {
 211                         $this->addFields( $value );
 212
 213                         return true;
 214                 }
 215
 216                 return false;
 217         }
 218
 219         /**
 220          * Add a set of WHERE clauses to the internal array.
 221          * Clauses can be formatted as 'foo=bar' or array('foo' => 'bar'),
 222          * the latter only works if the value is a constant (i.e. not another field)
 223          *
 224          * If $value is an empty array, this function does nothing.
 225          *
 226          * For example, array('foo=bar', 'baz' => 3, 'bla' => 'foo') translates
 227          * to "foo=bar AND baz='3' AND bla='foo'"
 228          * @param string|array $value
 229          */
 230         protected function addWhere( $value ) {
 231                 if ( is_array( $value ) ) {
 232                         // Sanity check: don't insert empty arrays,
 233                         // Database::makeList() chokes on them
 234                         if ( count( $value ) ) {
 235                                 $this->where = array_merge( $this->where, $value );
 236                         }
 237                 } else {
 238                         $this->where[] = $value;
 239                 }
 240         }
 241
 242         /**
 243          * Same as addWhere(), but add the WHERE clauses only if a condition is met
 244          * @param string|array $value
 245          * @param bool $condition If false, do nothing
 246          * @return bool $condition
 247          */
 248         protected function addWhereIf( $value, $condition ) {
 249                 if ( $condition ) {
 250                         $this->addWhere( $value );
 251
 252                         return true;
 253                 }
 254
 255                 return false;
 256         }
 257
 258         /**
 259          * Equivalent to addWhere(array($field => $value))
 260          * @param string $field Field name
 261          * @param string $value Value; ignored if null or empty array;
 262          */
 263         protected function addWhereFld( $field, $value ) {
 264                 // Use count() to its full documented capabilities to simultaneously
 265                 // test for null, empty array or empty countable object
 266                 if ( count( $value ) ) {
 267                         $this->where[$field] = $value;
 268                 }
 269         }
 270
 271         /**
 272          * Add a WHERE clause corresponding to a range, and an ORDER BY
 273          * clause to sort in the right direction
 274          * @param string $field Field name
 275          * @param string $dir If 'newer', sort in ascending order, otherwise
 276          *  sort in descending order
 277          * @param string $start Value to start the list at. If $dir == 'newer'
 278          *  this is the lower boundary, otherwise it's the upper boundary
 279          * @param string $end Value to end the list at. If $dir == 'newer' this
 280          *  is the upper boundary, otherwise it's the lower boundary
 281          * @param bool $sort If false, don't add an ORDER BY clause
 282          */
 283         protected function addWhereRange( $field, $dir, $start, $end, $sort = true ) {
 284                 $isDirNewer = ( $dir === 'newer' );
 285                 $after = ( $isDirNewer ? '>=' : '<=' );
 286                 $before = ( $isDirNewer ? '<=' : '>=' );
 287                 $db = $this->getDB();
 288
 289                 if ( !is_null( $start ) ) {
 290                         $this->addWhere( $field . $after . $db->addQuotes( $start ) );
 291                 }
 292
 293                 if ( !is_null( $end ) ) {
 294                         $this->addWhere( $field . $before . $db->addQuotes( $end ) );
 295                 }
 296
 297                 if ( $sort ) {
 298                         $order = $field . ( $isDirNewer ? '' : ' DESC' );
 299                         // Append ORDER BY
 300                         $optionOrderBy = isset( $this->options['ORDER BY'] )
 301                                 ? (array)$this->options['ORDER BY']
 302                                 : array();
 303                         $optionOrderBy[] = $order;
 304                         $this->addOption( 'ORDER BY', $optionOrderBy );
 305                 }
 306         }
 307
 308         /**
 309          * Add a WHERE clause corresponding to a range, similar to addWhereRange,
 310          * but converts $start and $end to database timestamps.
 311          * @see addWhereRange
 312          * @param string $field
 313          * @param string $dir
 314          * @param string $start
 315          * @param string $end
 316          * @param bool $sort
 317          */
 318         protected function addTimestampWhereRange( $field, $dir, $start, $end, $sort = true ) {
 319                 $db = $this->getDb();
 320                 $this->addWhereRange( $field, $dir,
 321                         $db->timestampOrNull( $start ), $db->timestampOrNull( $end ), $sort );
 322         }
 323
 324         /**
 325          * Add an option such as LIMIT or USE INDEX. If an option was set
 326          * before, the old value will be overwritten
 327          * @param string $name Option name
 328          * @param string $value Option value
 329          */
 330         protected function addOption( $name, $value = null ) {
 331                 if ( is_null( $value ) ) {
 332                         $this->options[] = $name;
 333                 } else {
 334                         $this->options[$name] = $value;
 335                 }
 336         }
 337
 338         /**
 339          * Execute a SELECT query based on the values in the internal arrays
 340          * @param string $method Function the query should be attributed to.
 341          *  You should usually use __METHOD__ here
 342          * @param array $extraQuery Query data to add but not store in the object
 343          *  Format is array(
 344          *    'tables' => ...,
 345          *    'fields' => ...,
 346          *    'where' => ...,
 347          *    'options' => ...,
 348          *    'join_conds' => ...
 349          *  )
 350          * @return ResultWrapper
 351          */
 352         protected function select( $method, $extraQuery = array() ) {
 353
 354                 $tables = array_merge(
 355                         $this->tables,
 356                         isset( $extraQuery['tables'] ) ? (array)$extraQuery['tables'] : array()
 357                 );
 358                 $fields = array_merge(
 359                         $this->fields,
 360                         isset( $extraQuery['fields'] ) ? (array)$extraQuery['fields'] : array()
 361                 );
 362                 $where = array_merge(
 363                         $this->where,
 364                         isset( $extraQuery['where'] ) ? (array)$extraQuery['where'] : array()
 365                 );
 366                 $options = array_merge(
 367                         $this->options,
 368                         isset( $extraQuery['options'] ) ? (array)$extraQuery['options'] : array()
 369                 );
 370                 $join_conds = array_merge(
 371                         $this->join_conds,
 372                         isset( $extraQuery['join_conds'] ) ? (array)$extraQuery['join_conds'] : array()
 373                 );
 374
 375                 // getDB has its own profileDBIn/Out calls
 376                 $db = $this->getDB();
 377
 378                 $this->profileDBIn();
 379                 $res = $db->select( $tables, $fields, $where, $method, $options, $join_conds );
 380                 $this->profileDBOut();
 381
 382                 return $res;
 383         }
 384
 385         /**
 386          * @param string $query
 387          * @param string $protocol
 388          * @return null|string
 389          */
 390         public function prepareUrlQuerySearchString( $query = null, $protocol = null ) {
 391                 $db = $this->getDb();
 392                 if ( !is_null( $query ) || $query != '' ) {
 393                         if ( is_null( $protocol ) ) {
 394                                 $protocol = 'http://';
 395                         }
 396
 397                         $likeQuery = LinkFilter::makeLikeArray( $query, $protocol );
 398                         if ( !$likeQuery ) {
 399                                 $this->dieUsage( 'Invalid query', 'bad_query' );
 400                         }
 401
 402                         $likeQuery = LinkFilter::keepOneWildcard( $likeQuery );
 403
 404                         return 'el_index ' . $db->buildLike( $likeQuery );
 405                 } elseif ( !is_null( $protocol ) ) {
 406                         return 'el_index ' . $db->buildLike( "$protocol", $db->anyString() );
 407                 }
 408
 409                 return null;
 410         }
 411
 412         /**
 413          * Filters hidden users (where the user doesn't have the right to view them)
 414          * Also adds relevant block information
 415          *
 416          * @param bool $showBlockInfo
 417          * @return void
 418          */
 419         public function showHiddenUsersAddBlockInfo( $showBlockInfo ) {
 420                 $this->addTables( 'ipblocks' );
 421                 $this->addJoinConds( array(
 422                         'ipblocks' => array( 'LEFT JOIN', 'ipb_user=user_id' ),
 423                 ) );
 424
 425                 $this->addFields( 'ipb_deleted' );
 426
 427                 if ( $showBlockInfo ) {
 428                         $this->addFields( array( 'ipb_id', 'ipb_by', 'ipb_by_text', 'ipb_reason', 'ipb_expiry', 'ipb_timestamp' ) );
 429                 }
 430
 431                 // Don't show hidden names
 432                 if ( !$this->getUser()->isAllowed( 'hideuser' ) ) {
 433                         $this->addWhere( 'ipb_deleted = 0 OR ipb_deleted IS NULL' );
 434                 }
 435         }
 436
 437         /**@}*/
 438
 439         /************************************************************************//**
 440          * @name   Utility methods
 441          * @{
 442          */
 443
 444         /**
 445          * Add information (title and namespace) about a Title object to a
 446          * result array
 447          * @param array $arr Result array à la ApiResult
 448          * @param Title $title
 449          * @param string $prefix Module prefix
 450          */
 451         public static function addTitleInfo( &$arr, $title, $prefix = '' ) {
 452                 $arr[$prefix . 'ns'] = intval( $title->getNamespace() );
 453                 $arr[$prefix . 'title'] = $title->getPrefixedText();
 454         }
 455
 456         /**
 457          * Add a sub-element under the page element with the given page ID
 458          * @param int $pageId Page ID
 459          * @param array $data Data array à la ApiResult
 460          * @return bool Whether the element fit in the result
 461          */
 462         protected function addPageSubItems( $pageId, $data ) {
 463                 $result = $this->getResult();
 464                 $result->setIndexedTagName( $data, $this->getModulePrefix() );
 465
 466                 return $result->addValue( array( 'query', 'pages', intval( $pageId ) ),
 467                         $this->getModuleName(),
 468                         $data );
 469         }
 470
 471         /**
 472          * Same as addPageSubItems(), but one element of $data at a time
 473          * @param int $pageId Page ID
 474          * @param array $item Data array à la ApiResult
 475          * @param string $elemname XML element name. If null, getModuleName()
 476          *  is used
 477          * @return bool Whether the element fit in the result
 478          */
 479         protected function addPageSubItem( $pageId, $item, $elemname = null ) {
 480                 if ( is_null( $elemname ) ) {
 481                         $elemname = $this->getModulePrefix();
 482                 }
 483                 $result = $this->getResult();
 484                 $fit = $result->addValue( array( 'query', 'pages', $pageId,
 485                         $this->getModuleName() ), null, $item );
 486                 if ( !$fit ) {
 487                         return false;
 488                 }
 489                 $result->setIndexedTagName_internal( array( 'query', 'pages', $pageId,
 490                         $this->getModuleName() ), $elemname );
 491
 492                 return true;
 493         }
 494
 495         /**
 496          * Set a query-continue value
 497          * @param string $paramName Parameter name
 498          * @param string|array $paramValue Parameter value
 499          */
 500         protected function setContinueEnumParameter( $paramName, $paramValue ) {
 501                 $this->getResult()->setContinueParam( $this, $paramName, $paramValue );
 502         }
 503
 504         /**
 505          * Convert an input title or title prefix into a dbkey.
 506          *
 507          * $namespace should always be specified in order to handle per-namespace
 508          * capitalization settings.
 509          *
 510          * @param string $titlePart Title part
 511          * @param int $defaultNamespace Namespace of the title
 512          * @return string DBkey (no namespace prefix)
 513          */
 514         public function titlePartToKey( $titlePart, $namespace = NS_MAIN ) {
 515                 $t = Title::makeTitleSafe( $namespace, $titlePart . 'x' );
 516                 if ( !$t || $t->hasFragment() ) {
 517                         // Invalid title (e.g. bad chars) or contained a '#'.
 518                         $this->dieUsageMsg( array( 'invalidtitle', $titlePart ) );
 519                 }
 520                 if ( $namespace != $t->getNamespace() || $t->isExternal() ) {
 521                         // This can happen in two cases. First, if you call titlePartToKey with a title part
 522                         // that looks like a namespace, but with $defaultNamespace = NS_MAIN. It would be very
 523                         // difficult to handle such a case. Such cases cannot exist and are therefore treated
 524                         // as invalid user input. The second case is when somebody specifies a title interwiki
 525                         // prefix.
 526                         $this->dieUsageMsg( array( 'invalidtitle', $titlePart ) );
 527                 }
 528
 529                 return substr( $t->getDbKey(), 0, -1 );
 530         }
 531
 532         /**
 533          * Gets the personalised direction parameter description
 534          *
 535          * @param string $p ModulePrefix
 536          * @param string $extraDirText Any extra text to be appended on the description
 537          * @return array
 538          */
 539         public function getDirectionDescription( $p = '', $extraDirText = '' ) {
 540                 return array(
 541                         "In which direction to enumerate{$extraDirText}",
 542                         " newer          - List oldest first. Note: {$p}start has to be before {$p}end.",
 543                         " older          - List newest first (default). Note: {$p}start has to be later than {$p}end.",
 544                 );
 545         }
 546
 547         /**
 548          * @param string $hash
 549          * @return bool
 550          */
 551         public function validateSha1Hash( $hash ) {
 552                 return preg_match( '/^[a-f0-9]{40}$/', $hash );
 553         }
 554
 555         /**
 556          * @param string $hash
 557          * @return bool
 558          */
 559         public function validateSha1Base36Hash( $hash ) {
 560                 return preg_match( '/^[a-z0-9]{31}$/', $hash );
 561         }
 562
 563         /**
 564          * Check whether the current user has permission to view revision-deleted
 565          * fields.
 566          * @return bool
 567          */
 568         public function userCanSeeRevDel() {
 569                 return $this->getUser()->isAllowedAny(
 570                         'deletedhistory',
 571                         'deletedtext',
 572                         'suppressrevision',
 573                         'viewsuppressed'
 574                 );
 575         }
 576
 577         /**@}*/
 578
 579         /************************************************************************//**
 580          * @name   Deprecated
 581          * @{
 582          */
 583
 584         /**
 585          * Estimate the row count for the SELECT query that would be run if we
 586          * called select() right now, and check if it's acceptable.
 587          * @deprecated since 1.24
 588          * @return bool True if acceptable, false otherwise
 589          */
 590         protected function checkRowCount() {
 591                 wfDeprecated( __METHOD__, '1.24' );
 592                 $db = $this->getDB();
 593                 $this->profileDBIn();
 594                 $rowcount = $db->estimateRowCount(
 595                         $this->tables,
 596                         $this->fields,
 597                         $this->where,
 598                         __METHOD__,
 599                         $this->options
 600                 );
 601                 $this->profileDBOut();
 602
 603                 if ( $rowcount > $this->getConfig()->get( 'APIMaxDBRows' ) ) {
 604                         return false;
 605                 }
 606
 607                 return true;
 608         }
 609
 610         /**
 611          * Convert a title to a DB key
 612          * @deprecated since 1.24, past uses of this were always incorrect and should
 613          *   have used self::titlePartToKey() instead
 614          * @param string $title Page title with spaces
 615          * @return string Page title with underscores
 616          */
 617         public function titleToKey( $title ) {
 618                 wfDeprecated( __METHOD__, '1.24' );
 619                 // Don't throw an error if we got an empty string
 620                 if ( trim( $title ) == '' ) {
 621                         return '';
 622                 }
 623                 $t = Title::newFromText( $title );
 624                 if ( !$t ) {
 625                         $this->dieUsageMsg( array( 'invalidtitle', $title ) );
 626                 }
 627
 628                 return $t->getPrefixedDBkey();
 629         }
 630
 631         /**
 632          * The inverse of titleToKey()
 633          * @deprecated since 1.24, unused and probably never needed
 634          * @param string $key Page title with underscores
 635          * @return string Page title with spaces
 636          */
 637         public function keyToTitle( $key ) {
 638                 wfDeprecated( __METHOD__, '1.24' );
 639                 // Don't throw an error if we got an empty string
 640                 if ( trim( $key ) == '' ) {
 641                         return '';
 642                 }
 643                 $t = Title::newFromDBkey( $key );
 644                 // This really shouldn't happen but we gotta check anyway
 645                 if ( !$t ) {
 646                         $this->dieUsageMsg( array( 'invalidtitle', $key ) );
 647                 }
 648
 649                 return $t->getPrefixedText();
 650         }
 651
 652         /**
 653          * Inverse of titlePartToKey()
 654          * @deprecated since 1.24, unused and probably never needed
 655          * @param string $keyPart DBkey, with prefix
 656          * @return string Key part with underscores
 657          */
 658         public function keyPartToTitle( $keyPart ) {
 659                 wfDeprecated( __METHOD__, '1.24' );
 660                 return substr( $this->keyToTitle( $keyPart . 'x' ), 0, -1 );
 661         }
 662
 663         /**@}*/
 664 }
 665
 666 /**
 667  * @ingroup API
 668  */
 669 abstract class ApiQueryGeneratorBase extends ApiQueryBase {
 670
 671         private $mGeneratorPageSet = null;
 672
 673         /**
 674          * Switch this module to generator mode. By default, generator mode is
 675          * switched off and the module acts like a normal query module.
 676          * @since 1.21 requires pageset parameter
 677          * @param ApiPageSet $generatorPageSet ApiPageSet object that the module will get
 678          *        by calling getPageSet() when in generator mode.
 679          */
 680         public function setGeneratorMode( ApiPageSet $generatorPageSet ) {
 681                 if ( $generatorPageSet === null ) {
 682                         ApiBase::dieDebug( __METHOD__, 'Required parameter missing - $generatorPageSet' );
 683                 }
 684                 $this->mGeneratorPageSet = $generatorPageSet;
 685         }
 686
 687         /**
 688          * Get the PageSet object to work on.
 689          * If this module is generator, the pageSet object is different from other module's
 690          * @return ApiPageSet
 691          */
 692         protected function getPageSet() {
 693                 if ( $this->mGeneratorPageSet !== null ) {
 694                         return $this->mGeneratorPageSet;
 695                 }
 696
 697                 return parent::getPageSet();
 698         }
 699
 700         /**
 701          * Overrides ApiBase to prepend 'g' to every generator parameter
 702          * @param string $paramName Parameter name
 703          * @return string Prefixed parameter name
 704          */
 705         public function encodeParamName( $paramName ) {
 706                 if ( $this->mGeneratorPageSet !== null ) {
 707                         return 'g' . parent::encodeParamName( $paramName );
 708                 } else {
 709                         return parent::encodeParamName( $paramName );
 710                 }
 711         }
 712
 713         /**
 714          * Overridden to set the generator param if in generator mode
 715          * @param string $paramName Parameter name
 716          * @param string|array $paramValue Parameter value
 717          */
 718         protected function setContinueEnumParameter( $paramName, $paramValue ) {
 719                 if ( $this->mGeneratorPageSet !== null ) {
 720                         $this->getResult()->setGeneratorContinueParam( $this, $paramName, $paramValue );
 721                 } else {
 722                         parent::setContinueEnumParameter( $paramName, $paramValue );
 723                 }
 724         }
 725
 726         /**
 727          * @see ApiBase::getHelpFlags()
 728          *
 729          * Corresponding messages: api-help-flag-generator
 730          */
 731         protected function getHelpFlags() {
 732                 $flags = parent::getHelpFlags();
 733                 $flags[] = 'generator';
 734                 return $flags;
 735         }
 736
 737         /**
 738          * Execute this module as a generator
 739          * @param ApiPageSet $resultPageSet All output should be appended to this object
 740          */
 741         abstract public function executeGenerator( $resultPageSet );
 742 }