includes/api/ApiPageSet.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on Sep 24, 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 if ( !defined( 'MEDIAWIKI' ) ) {
  28         // Eclipse helper - will be ignored in production
  29         require_once( 'ApiQueryBase.php' );
  30 }
  31
  32 /**
  33  * This class contains a list of pages that the client has requested.
  34  * Initially, when the client passes in titles=, pageids=, or revisions=
  35  * parameter, an instance of the ApiPageSet class will normalize titles,
  36  * determine if the pages/revisions exist, and prefetch any additional page
  37  * data requested.
  38  *
  39  * When a generator is used, the result of the generator will become the input
  40  * for the second instance of this class, and all subsequent actions will use
  41  * the second instance for all their work.
  42  *
  43  * @ingroup API
  44  */
  45 class ApiPageSet extends ApiQueryBase {
  46
  47         private $mAllPages; // [ns][dbkey] => page_id or negative when missing
  48         private $mTitles, $mGoodTitles, $mMissingTitles, $mInvalidTitles;
  49         private $mMissingPageIDs, $mRedirectTitles, $mSpecialTitles;
  50         private $mNormalizedTitles, $mInterwikiTitles;
  51         private $mResolveRedirects, $mPendingRedirectIDs;
  52         private $mConvertTitles, $mConvertedTitles;
  53         private $mGoodRevIDs, $mMissingRevIDs;
  54         private $mFakePageId;
  55
  56         private $mRequestedPageFields;
  57
  58         /**
  59          * Constructor
  60          * @param $query ApiQuery
  61          * @param $resolveRedirects bool Whether redirects should be resolved
  62          * @param $convertTitles bool
  63          */
  64         public function __construct( $query, $resolveRedirects = false, $convertTitles = false ) {
  65                 parent::__construct( $query, 'query' );
  66
  67                 $this->mAllPages = array();
  68                 $this->mTitles = array();
  69                 $this->mGoodTitles = array();
  70                 $this->mMissingTitles = array();
  71                 $this->mInvalidTitles = array();
  72                 $this->mMissingPageIDs = array();
  73                 $this->mRedirectTitles = array();
  74                 $this->mNormalizedTitles = array();
  75                 $this->mInterwikiTitles = array();
  76                 $this->mGoodRevIDs = array();
  77                 $this->mMissingRevIDs = array();
  78                 $this->mSpecialTitles = array();
  79
  80                 $this->mRequestedPageFields = array();
  81                 $this->mResolveRedirects = $resolveRedirects;
  82                 if ( $resolveRedirects ) {
  83                         $this->mPendingRedirectIDs = array();
  84                 }
  85
  86                 $this->mConvertTitles = $convertTitles;
  87                 $this->mConvertedTitles = array();
  88
  89                 $this->mFakePageId = - 1;
  90         }
  91
  92         /**
  93          * Check whether this PageSet is resolving redirects
  94          * @return bool
  95          */
  96         public function isResolvingRedirects() {
  97                 return $this->mResolveRedirects;
  98         }
  99
 100         /**
 101          * Request an additional field from the page table. Must be called
 102          * before execute()
 103          * @param $fieldName string Field name
 104          */
 105         public function requestField( $fieldName ) {
 106                 $this->mRequestedPageFields[$fieldName] = null;
 107         }
 108
 109         /**
 110          * Get the value of a custom field previously requested through
 111          * requestField()
 112          * @param $fieldName string Field name
 113          * @return mixed Field value
 114          */
 115         public function getCustomField( $fieldName ) {
 116                 return $this->mRequestedPageFields[$fieldName];
 117         }
 118
 119         /**
 120          * Get the fields that have to be queried from the page table:
 121          * the ones requested through requestField() and a few basic ones
 122          * we always need
 123          * @return array of field names
 124          */
 125         public function getPageTableFields() {
 126                 // Ensure we get minimum required fields
 127                 // DON'T change this order
 128                 $pageFlds = array(
 129                         'page_namespace' => null,
 130                         'page_title' => null,
 131                         'page_id' => null,
 132                 );
 133
 134                 if ( $this->mResolveRedirects ) {
 135                         $pageFlds['page_is_redirect'] = null;
 136                 }
 137
 138                 // only store non-default fields
 139                 $this->mRequestedPageFields = array_diff_key( $this->mRequestedPageFields, $pageFlds );
 140
 141                 $pageFlds = array_merge( $pageFlds, $this->mRequestedPageFields );
 142                 return array_keys( $pageFlds );
 143         }
 144
 145         /**
 146          * Returns an array [ns][dbkey] => page_id for all requested titles.
 147          * page_id is a unique negative number in case title was not found.
 148          * Invalid titles will also have negative page IDs and will be in namespace 0
 149          * @return array
 150          */
 151         public function getAllTitlesByNamespace() {
 152                 return $this->mAllPages;
 153         }
 154
 155         /**
 156          * All Title objects provided.
 157          * @return array of Title objects
 158          */
 159         public function getTitles() {
 160                 return $this->mTitles;
 161         }
 162
 163         /**
 164          * Returns the number of unique pages (not revisions) in the set.
 165          * @return int
 166          */
 167         public function getTitleCount() {
 168                 return count( $this->mTitles );
 169         }
 170
 171         /**
 172          * Title objects that were found in the database.
 173          * @return array page_id (int) => Title (obj)
 174          */
 175         public function getGoodTitles() {
 176                 return $this->mGoodTitles;
 177         }
 178
 179         /**
 180          * Returns the number of found unique pages (not revisions) in the set.
 181          * @return int
 182          */
 183         public function getGoodTitleCount() {
 184                 return count( $this->mGoodTitles );
 185         }
 186
 187         /**
 188          * Title objects that were NOT found in the database.
 189          * The array's index will be negative for each item
 190          * @return array of Title objects
 191          */
 192         public function getMissingTitles() {
 193                 return $this->mMissingTitles;
 194         }
 195
 196         /**
 197          * Titles that were deemed invalid by Title::newFromText()
 198          * The array's index will be unique and negative for each item
 199          * @return array of strings (not Title objects)
 200          */
 201         public function getInvalidTitles() {
 202                 return $this->mInvalidTitles;
 203         }
 204
 205         /**
 206          * Page IDs that were not found in the database
 207          * @return array of page IDs
 208          */
 209         public function getMissingPageIDs() {
 210                 return $this->mMissingPageIDs;
 211         }
 212
 213         /**
 214          * Get a list of redirect resolutions - maps a title to its redirect
 215          * target.
 216          * @return array prefixed_title (string) => Title object
 217          */
 218         public function getRedirectTitles() {
 219                 return $this->mRedirectTitles;
 220         }
 221
 222         /**
 223          * Get a list of title normalizations - maps a title to its normalized
 224          * version.
 225          * @return array raw_prefixed_title (string) => prefixed_title (string)
 226          */
 227         public function getNormalizedTitles() {
 228                 return $this->mNormalizedTitles;
 229         }
 230
 231         /**
 232          * Get a list of title conversions - maps a title to its converted
 233          * version.
 234          * @return array raw_prefixed_title (string) => prefixed_title (string)
 235          */
 236         public function getConvertedTitles() {
 237                 return $this->mConvertedTitles;
 238         }
 239
 240         /**
 241          * Get a list of interwiki titles - maps a title to its interwiki
 242          * prefix.
 243          * @return array raw_prefixed_title (string) => interwiki_prefix (string)
 244          */
 245         public function getInterwikiTitles() {
 246                 return $this->mInterwikiTitles;
 247         }
 248
 249         /**
 250          * Get the list of revision IDs (requested with the revids= parameter)
 251          * @return array revID (int) => pageID (int)
 252          */
 253         public function getRevisionIDs() {
 254                 return $this->mGoodRevIDs;
 255         }
 256
 257         /**
 258          * Revision IDs that were not found in the database
 259          * @return array of revision IDs
 260          */
 261         public function getMissingRevisionIDs() {
 262                 return $this->mMissingRevIDs;
 263         }
 264
 265         /**
 266          * Get the list of titles with negative namespace
 267          * @return array Title
 268          */
 269         public function getSpecialTitles() {
 270                 return $this->mSpecialTitles;
 271         }
 272
 273         /**
 274          * Returns the number of revisions (requested with revids= parameter)\
 275          * @return int
 276          */
 277         public function getRevisionCount() {
 278                 return count( $this->getRevisionIDs() );
 279         }
 280
 281         /**
 282          * Populate the PageSet from the request parameters.
 283          */
 284         public function execute() {
 285                 $this->profileIn();
 286                 $params = $this->extractRequestParams();
 287
 288                 // Only one of the titles/pageids/revids is allowed at the same time
 289                 $dataSource = null;
 290                 if ( isset( $params['titles'] ) ) {
 291                         $dataSource = 'titles';
 292                 }
 293                 if ( isset( $params['pageids'] ) ) {
 294                         if ( isset( $dataSource ) ) {
 295                                 $this->dieUsage( "Cannot use 'pageids' at the same time as '$dataSource'", 'multisource' );
 296                         }
 297                         $dataSource = 'pageids';
 298                 }
 299                 if ( isset( $params['revids'] ) ) {
 300                         if ( isset( $dataSource ) ) {
 301                                 $this->dieUsage( "Cannot use 'revids' at the same time as '$dataSource'", 'multisource' );
 302                         }
 303                         $dataSource = 'revids';
 304                 }
 305
 306                 switch ( $dataSource ) {
 307                         case 'titles':
 308                                 $this->initFromTitles( $params['titles'] );
 309                                 break;
 310                         case 'pageids':
 311                                 $this->initFromPageIds( $params['pageids'] );
 312                                 break;
 313                         case 'revids':
 314                                 if ( $this->mResolveRedirects ) {
 315                                         $this->setWarning( 'Redirect resolution cannot be used together with the revids= parameter. ' .
 316                                         'Any redirects the revids= point to have not been resolved.' );
 317                                 }
 318                                 $this->mResolveRedirects = false;
 319                                 $this->initFromRevIDs( $params['revids'] );
 320                                 break;
 321                         default:
 322                                 // Do nothing - some queries do not need any of the data sources.
 323                                 break;
 324                 }
 325                 $this->profileOut();
 326         }
 327
 328         /**
 329          * Populate this PageSet from a list of Titles
 330          * @param $titles array of Title objects
 331          */
 332         public function populateFromTitles( $titles ) {
 333                 $this->profileIn();
 334                 $this->initFromTitles( $titles );
 335                 $this->profileOut();
 336         }
 337
 338         /**
 339          * Populate this PageSet from a list of page IDs
 340          * @param $pageIDs array of page IDs
 341          */
 342         public function populateFromPageIDs( $pageIDs ) {
 343                 $this->profileIn();
 344                 $this->initFromPageIds( $pageIDs );
 345                 $this->profileOut();
 346         }
 347
 348         /**
 349          * Populate this PageSet from a rowset returned from the database
 350          * @param $db Database object
 351          * @param $queryResult ResultWrapper Query result object
 352          */
 353         public function populateFromQueryResult( $db, $queryResult ) {
 354                 $this->profileIn();
 355                 $this->initFromQueryResult( $queryResult );
 356                 $this->profileOut();
 357         }
 358
 359         /**
 360          * Populate this PageSet from a list of revision IDs
 361          * @param $revIDs array of revision IDs
 362          */
 363         public function populateFromRevisionIDs( $revIDs ) {
 364                 $this->profileIn();
 365                 $this->initFromRevIDs( $revIDs );
 366                 $this->profileOut();
 367         }
 368
 369         /**
 370          * Extract all requested fields from the row received from the database
 371          * @param $row Result row
 372          */
 373         public function processDbRow( $row ) {
 374                 // Store Title object in various data structures
 375                 $title = Title::makeTitle( $row->page_namespace, $row->page_title );
 376
 377                 $pageId = intval( $row->page_id );
 378                 $this->mAllPages[$row->page_namespace][$row->page_title] = $pageId;
 379                 $this->mTitles[] = $title;
 380
 381                 if ( $this->mResolveRedirects && $row->page_is_redirect == '1' ) {
 382                         $this->mPendingRedirectIDs[$pageId] = $title;
 383                 } else {
 384                         $this->mGoodTitles[$pageId] = $title;
 385                 }
 386
 387                 foreach ( $this->mRequestedPageFields as $fieldName => &$fieldValues ) {
 388                         $fieldValues[$pageId] = $row-> $fieldName;
 389                 }
 390         }
 391
 392         /**
 393          * Resolve redirects, if applicable
 394          */
 395         public function finishPageSetGeneration() {
 396                 $this->profileIn();
 397                 $this->resolvePendingRedirects();
 398                 $this->profileOut();
 399         }
 400
 401         /**
 402          * This method populates internal variables with page information
 403          * based on the given array of title strings.
 404          *
 405          * Steps:
 406          * #1 For each title, get data from `page` table
 407          * #2 If page was not found in the DB, store it as missing
 408          *
 409          * Additionally, when resolving redirects:
 410          * #3 If no more redirects left, stop.
 411          * #4 For each redirect, get its target from the `redirect` table.
 412          * #5 Substitute the original LinkBatch object with the new list
 413          * #6 Repeat from step #1
 414          *
 415          * @param $titles array of Title objects or strings
 416          */
 417         private function initFromTitles( $titles ) {
 418                 // Get validated and normalized title objects
 419                 $linkBatch = $this->processTitlesArray( $titles );
 420                 if ( $linkBatch->isEmpty() ) {
 421                         return;
 422                 }
 423
 424                 $db = $this->getDB();
 425                 $set = $linkBatch->constructSet( 'page', $db );
 426
 427                 // Get pageIDs data from the `page` table
 428                 $this->profileDBIn();
 429                 $res = $db->select( 'page', $this->getPageTableFields(), $set,
 430                                         __METHOD__ );
 431                 $this->profileDBOut();
 432
 433                 // Hack: get the ns:titles stored in array(ns => array(titles)) format
 434                 $this->initFromQueryResult( $res, $linkBatch->data, true ); // process Titles
 435
 436                 // Resolve any found redirects
 437                 $this->resolvePendingRedirects();
 438         }
 439
 440         /**
 441          * Does the same as initFromTitles(), but is based on page IDs instead
 442          * @param $pageids array of page IDs
 443          */
 444         private function initFromPageIds( $pageids ) {
 445                 if ( !count( $pageids ) ) {
 446                         return;
 447                 }
 448
 449                 $pageids = array_map( 'intval', $pageids ); // paranoia
 450                 $remaining = array_flip( $pageids );
 451
 452                 $pageids = self::getPositiveIntegers( $pageids );
 453
 454                 $set = array(
 455                         'page_id' => $pageids
 456                 );
 457                 $db = $this->getDB();
 458
 459                 // Get pageIDs data from the `page` table
 460                 $this->profileDBIn();
 461                 $res = $db->select( 'page', $this->getPageTableFields(), $set,
 462                                         __METHOD__ );
 463                 $this->profileDBOut();
 464
 465                 $this->initFromQueryResult( $res, $remaining, false );  // process PageIDs
 466
 467                 // Resolve any found redirects
 468                 $this->resolvePendingRedirects();
 469         }
 470
 471         /**
 472          * Iterate through the result of the query on 'page' table,
 473          * and for each row create and store title object and save any extra fields requested.
 474          * @param $res ResultWrapper DB Query result
 475          * @param $remaining array of either pageID or ns/title elements (optional).
 476          *        If given, any missing items will go to $mMissingPageIDs and $mMissingTitles
 477          * @param $processTitles bool Must be provided together with $remaining.
 478          *        If true, treat $remaining as an array of [ns][title]
 479          *        If false, treat it as an array of [pageIDs]
 480          */
 481         private function initFromQueryResult( $res, &$remaining = null, $processTitles = null ) {
 482                 if ( !is_null( $remaining ) && is_null( $processTitles ) ) {
 483                         ApiBase::dieDebug( __METHOD__, 'Missing $processTitles parameter when $remaining is provided' );
 484                 }
 485
 486                 foreach ( $res as $row ) {
 487                         $pageId = intval( $row->page_id );
 488
 489                         // Remove found page from the list of remaining items
 490                         if ( isset( $remaining ) ) {
 491                                 if ( $processTitles ) {
 492                                         unset( $remaining[$row->page_namespace][$row->page_title] );
 493                                 } else {
 494                                         unset( $remaining[$pageId] );
 495                                 }
 496                         }
 497
 498                         // Store any extra fields requested by modules
 499                         $this->processDbRow( $row );
 500                 }
 501
 502                 if ( isset( $remaining ) ) {
 503                         // Any items left in the $remaining list are added as missing
 504                         if ( $processTitles ) {
 505                                 // The remaining titles in $remaining are non-existent pages
 506                                 foreach ( $remaining as $ns => $dbkeys ) {
 507                                         foreach ( array_keys( $dbkeys ) as $dbkey ) {
 508                                                 $title = Title::makeTitle( $ns, $dbkey );
 509                                                 $this->mAllPages[$ns][$dbkey] = $this->mFakePageId;
 510                                                 $this->mMissingTitles[$this->mFakePageId] = $title;
 511                                                 $this->mFakePageId--;
 512                                                 $this->mTitles[] = $title;
 513                                         }
 514                                 }
 515                         } else {
 516                                 // The remaining pageids do not exist
 517                                 if ( !$this->mMissingPageIDs ) {
 518                                         $this->mMissingPageIDs = array_keys( $remaining );
 519                                 } else {
 520                                         $this->mMissingPageIDs = array_merge( $this->mMissingPageIDs, array_keys( $remaining ) );
 521                                 }
 522                         }
 523                 }
 524         }
 525
 526         /**
 527          * Does the same as initFromTitles(), but is based on revision IDs
 528          * instead
 529          * @param $revids array of revision IDs
 530          */
 531         private function initFromRevIDs( $revids ) {
 532                 if ( !count( $revids ) ) {
 533                         return;
 534                 }
 535
 536                 $revids = array_map( 'intval', $revids ); // paranoia
 537                 $db = $this->getDB();
 538                 $pageids = array();
 539                 $remaining = array_flip( $revids );
 540
 541                 $revids = self::getPositiveIntegers( $revids );
 542
 543                 $tables = array( 'revision', 'page' );
 544                 $fields = array( 'rev_id', 'rev_page' );
 545                 $where = array( 'rev_id' => $revids, 'rev_page = page_id' );
 546
 547                 // Get pageIDs data from the `page` table
 548                 $this->profileDBIn();
 549                 $res = $db->select( $tables, $fields, $where,  __METHOD__ );
 550                 foreach ( $res as $row ) {
 551                         $revid = intval( $row->rev_id );
 552                         $pageid = intval( $row->rev_page );
 553                         $this->mGoodRevIDs[$revid] = $pageid;
 554                         $pageids[$pageid] = '';
 555                         unset( $remaining[$revid] );
 556                 }
 557                 $this->profileDBOut();
 558
 559                 $this->mMissingRevIDs = array_keys( $remaining );
 560
 561                 // Populate all the page information
 562                 $this->initFromPageIds( array_keys( $pageids ) );
 563         }
 564
 565         /**
 566          * Resolve any redirects in the result if redirect resolution was
 567          * requested. This function is called repeatedly until all redirects
 568          * have been resolved.
 569          */
 570         private function resolvePendingRedirects() {
 571                 if ( $this->mResolveRedirects ) {
 572                         $db = $this->getDB();
 573                         $pageFlds = $this->getPageTableFields();
 574
 575                         // Repeat until all redirects have been resolved
 576                         // The infinite loop is prevented by keeping all known pages in $this->mAllPages
 577                         while ( $this->mPendingRedirectIDs ) {
 578                                 // Resolve redirects by querying the pagelinks table, and repeat the process
 579                                 // Create a new linkBatch object for the next pass
 580                                 $linkBatch = $this->getRedirectTargets();
 581
 582                                 if ( $linkBatch->isEmpty() ) {
 583                                         break;
 584                                 }
 585
 586                                 $set = $linkBatch->constructSet( 'page', $db );
 587                                 if ( $set === false ) {
 588                                         break;
 589                                 }
 590
 591                                 // Get pageIDs data from the `page` table
 592                                 $this->profileDBIn();
 593                                 $res = $db->select( 'page', $pageFlds, $set, __METHOD__ );
 594                                 $this->profileDBOut();
 595
 596                                 // Hack: get the ns:titles stored in array(ns => array(titles)) format
 597                                 $this->initFromQueryResult( $res, $linkBatch->data, true );
 598                         }
 599                 }
 600         }
 601
 602         /**
 603          * Get the targets of the pending redirects from the database
 604          *
 605          * Also creates entries in the redirect table for redirects that don't
 606          * have one.
 607          * @return LinkBatch
 608          */
 609         private function getRedirectTargets() {
 610                 $lb = new LinkBatch();
 611                 $db = $this->getDB();
 612
 613                 $this->profileDBIn();
 614                 $res = $db->select(
 615                         'redirect',
 616                         array(
 617                                 'rd_from',
 618                                 'rd_namespace',
 619                                 'rd_fragment',
 620                                 'rd_interwiki',
 621                                 'rd_title'
 622                         ), array( 'rd_from' => array_keys( $this->mPendingRedirectIDs ) ),
 623                         __METHOD__
 624                 );
 625                 $this->profileDBOut();
 626                 foreach ( $res as $row ) {
 627                         $rdfrom = intval( $row->rd_from );
 628                         $from = $this->mPendingRedirectIDs[$rdfrom]->getPrefixedText();
 629                         $to = Title::makeTitle( $row->rd_namespace, $row->rd_title, $row->rd_fragment, $row->rd_interwiki );
 630                         unset( $this->mPendingRedirectIDs[$rdfrom] );
 631                         if ( !isset( $this->mAllPages[$row->rd_namespace][$row->rd_title] ) ) {
 632                                 $lb->add( $row->rd_namespace, $row->rd_title );
 633                         }
 634                         $this->mRedirectTitles[$from] = $to;
 635                 }
 636
 637                 if ( $this->mPendingRedirectIDs ) {
 638                         // We found pages that aren't in the redirect table
 639                         // Add them
 640                         foreach ( $this->mPendingRedirectIDs as $id => $title ) {
 641                                 $article = new Article( $title );
 642                                 $rt = $article->insertRedirect();
 643                                 if ( !$rt ) {
 644                                         // What the hell. Let's just ignore this
 645                                         continue;
 646                                 }
 647                                 $lb->addObj( $rt );
 648                                 $this->mRedirectTitles[$title->getPrefixedText()] = $rt;
 649                                 unset( $this->mPendingRedirectIDs[$id] );
 650                         }
 651                 }
 652                 return $lb;
 653         }
 654
 655         /**
 656          * Given an array of title strings, convert them into Title objects.
 657          * Alternativelly, an array of Title objects may be given.
 658          * This method validates access rights for the title,
 659          * and appends normalization values to the output.
 660          *
 661          * @param $titles array of Title objects or strings
 662          * @return LinkBatch
 663          */
 664         private function processTitlesArray( $titles ) {
 665                 $linkBatch = new LinkBatch();
 666
 667                 foreach ( $titles as $title ) {
 668                         $titleObj = is_string( $title ) ? Title::newFromText( $title ) : $title;
 669                         if ( !$titleObj ) {
 670                                 // Handle invalid titles gracefully
 671                                 $this->mAllpages[0][$title] = $this->mFakePageId;
 672                                 $this->mInvalidTitles[$this->mFakePageId] = $title;
 673                                 $this->mFakePageId--;
 674                                 continue; // There's nothing else we can do
 675                         }
 676                         $unconvertedTitle = $titleObj->getPrefixedText();
 677                         $titleWasConverted = false;
 678                         $iw = $titleObj->getInterwiki();
 679                         if ( strval( $iw ) !== '' ) {
 680                                 // This title is an interwiki link.
 681                                 $this->mInterwikiTitles[$titleObj->getPrefixedText()] = $iw;
 682                         } else {
 683                                 // Variants checking
 684                                 global $wgContLang;
 685                                 if ( $this->mConvertTitles &&
 686                                                 count( $wgContLang->getVariants() ) > 1  &&
 687                                                 !$titleObj->exists() ) {
 688                                         // Language::findVariantLink will modify titleObj into
 689                                         // the canonical variant if possible
 690                                         $wgContLang->findVariantLink( $title, $titleObj );
 691                                         $titleWasConverted = $unconvertedTitle !== $titleObj->getPrefixedText();
 692                                 }
 693
 694                                 if ( $titleObj->getNamespace() < 0 ) {
 695                                         // Handle Special and Media pages
 696                                         $titleObj = $titleObj->fixSpecialName();
 697                                         $this->mSpecialTitles[$this->mFakePageId] = $titleObj;
 698                                         $this->mFakePageId--;
 699                                 } else {
 700                                         // Regular page
 701                                         $linkBatch->addObj( $titleObj );
 702                                 }
 703                         }
 704
 705                         // Make sure we remember the original title that was
 706                         // given to us. This way the caller can correlate new
 707                         // titles with the originally requested when e.g. the
 708                         // namespace is localized or the capitalization is
 709                         // different
 710                         if ( $titleWasConverted ) {
 711                                 $this->mConvertedTitles[$title] = $titleObj->getPrefixedText();
 712                         } elseif ( is_string( $title ) && $title !== $titleObj->getPrefixedText() ) {
 713                                 $this->mNormalizedTitles[$title] = $titleObj->getPrefixedText();
 714                         }
 715                 }
 716
 717                 return $linkBatch;
 718         }
 719
 720         /**
 721          * Returns the input array of integers with all values < 0 removed
 722          *
 723          * @param $array array
 724          * @return array
 725          */
 726         private static function getPositiveIntegers( $array ) {
 727                 // bug 25734 API: possible issue with revids validation
 728                 // It seems with a load of revision rows, MySQL gets upset
 729                 // Remove any < 0 integers, as they can't be valid
 730                 foreach( $array as $i => $int ) {
 731                         if ( $int < 0 ) {
 732                                 unset( $array[$i] );
 733                         }
 734                 }
 735
 736                 return $array;
 737         }
 738
 739         protected function getAllowedParams() {
 740                 return array(
 741                         'titles' => array(
 742                                 ApiBase::PARAM_ISMULTI => true
 743                         ),
 744                         'pageids' => array(
 745                                 ApiBase::PARAM_TYPE => 'integer',
 746                                 ApiBase::PARAM_ISMULTI => true
 747                         ),
 748                         'revids' => array(
 749                                 ApiBase::PARAM_TYPE => 'integer',
 750                                 ApiBase::PARAM_ISMULTI => true
 751                         )
 752                 );
 753         }
 754
 755         protected function getParamDescription() {
 756                 return array(
 757                         'titles' => 'A list of titles to work on',
 758                         'pageids' => 'A list of page IDs to work on',
 759                         'revids' => 'A list of revision IDs to work on'
 760                 );
 761         }
 762
 763         public function getPossibleErrors() {
 764                 return array_merge( parent::getPossibleErrors(), array(
 765                         array( 'code' => 'multisource', 'info' => "Cannot use 'pageids' at the same time as 'dataSource'" ),
 766                         array( 'code' => 'multisource', 'info' => "Cannot use 'revids' at the same time as 'dataSource'" ),
 767                 ) );
 768         }
 769
 770         public function getVersion() {
 771                 return __CLASS__ . ': $Id$';
 772         }
 773 }