697 lines
20 KiB
PHP
697 lines
20 KiB
PHP
<?php
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/*
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* Created on Sep 24, 2006
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*
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* API for MediaWiki 1.8+
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*
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* Copyright (C) 2006 Yuri Astrakhan <Firstname><Lastname>@gmail.com
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*/
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if (!defined('MEDIAWIKI')) {
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// Eclipse helper - will be ignored in production
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require_once ('ApiQueryBase.php');
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}
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/**
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* This class contains a list of pages that the client has requested.
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* Initially, when the client passes in titles=, pageids=, or revisions=
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* parameter, an instance of the ApiPageSet class will normalize titles,
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* determine if the pages/revisions exist, and prefetch any additional page
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* data requested.
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*
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* When a generator is used, the result of the generator will become the input
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* for the second instance of this class, and all subsequent actions will use
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* the second instance for all their work.
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*
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* @ingroup API
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*/
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class ApiPageSet extends ApiQueryBase {
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private $mAllPages; // [ns][dbkey] => page_id or negative when missing
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private $mTitles, $mGoodTitles, $mMissingTitles, $mInvalidTitles;
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private $mMissingPageIDs, $mRedirectTitles;
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private $mNormalizedTitles, $mInterwikiTitles;
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private $mResolveRedirects, $mPendingRedirectIDs;
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private $mGoodRevIDs, $mMissingRevIDs;
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private $mFakePageId;
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private $mRequestedPageFields;
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/**
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* Constructor
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* @param $query ApiQuery
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* @param $resolveRedirects bool Whether redirects should be resolved
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*/
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public function __construct($query, $resolveRedirects = false) {
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parent :: __construct($query, 'query');
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$this->mAllPages = array ();
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$this->mTitles = array();
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$this->mGoodTitles = array ();
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$this->mMissingTitles = array ();
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$this->mInvalidTitles = array ();
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$this->mMissingPageIDs = array ();
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$this->mRedirectTitles = array ();
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$this->mNormalizedTitles = array ();
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$this->mInterwikiTitles = array ();
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$this->mGoodRevIDs = array();
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$this->mMissingRevIDs = array();
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$this->mRequestedPageFields = array ();
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$this->mResolveRedirects = $resolveRedirects;
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if($resolveRedirects)
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$this->mPendingRedirectIDs = array();
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$this->mFakePageId = -1;
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}
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/**
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* Check whether this PageSet is resolving redirects
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* @return bool
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*/
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public function isResolvingRedirects() {
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return $this->mResolveRedirects;
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}
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/**
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* Request an additional field from the page table. Must be called
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* before execute()
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* @param $fieldName string Field name
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*/
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public function requestField($fieldName) {
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$this->mRequestedPageFields[$fieldName] = null;
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}
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/**
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* Get the value of a custom field previously requested through
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* requestField()
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* @param $fieldName string Field name
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* @return mixed Field value
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*/
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public function getCustomField($fieldName) {
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return $this->mRequestedPageFields[$fieldName];
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}
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/**
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* Get the fields that have to be queried from the page table:
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* the ones requested through requestField() and a few basic ones
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* we always need
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* @return array of field names
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*/
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public function getPageTableFields() {
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// Ensure we get minimum required fields
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// DON'T change this order
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$pageFlds = array (
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'page_namespace' => null,
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'page_title' => null,
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'page_id' => null,
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);
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if ($this->mResolveRedirects)
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$pageFlds['page_is_redirect'] = null;
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// only store non-default fields
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$this->mRequestedPageFields = array_diff_key($this->mRequestedPageFields, $pageFlds);
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$pageFlds = array_merge($pageFlds, $this->mRequestedPageFields);
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return array_keys($pageFlds);
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}
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/**
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* Returns an array [ns][dbkey] => page_id for all requested titles.
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* page_id is a unique negative number in case title was not found.
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* Invalid titles will also have negative page IDs and will be in namespace 0
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* @return array
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*/
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public function getAllTitlesByNamespace() {
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return $this->mAllPages;
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}
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/**
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* All Title objects provided.
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* @return array of Title objects
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*/
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public function getTitles() {
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return $this->mTitles;
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}
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/**
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* Returns the number of unique pages (not revisions) in the set.
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* @return int
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*/
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public function getTitleCount() {
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return count($this->mTitles);
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}
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/**
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* Title objects that were found in the database.
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* @return array page_id (int) => Title (obj)
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*/
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public function getGoodTitles() {
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return $this->mGoodTitles;
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}
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/**
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* Returns the number of found unique pages (not revisions) in the set.
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* @return int
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*/
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public function getGoodTitleCount() {
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return count($this->mGoodTitles);
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}
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/**
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* Title objects that were NOT found in the database.
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* The array's index will be negative for each item
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* @return array of Title objects
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*/
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public function getMissingTitles() {
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return $this->mMissingTitles;
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}
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/**
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* Titles that were deemed invalid by Title::newFromText()
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* The array's index will be unique and negative for each item
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* @return array of strings (not Title objects)
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*/
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public function getInvalidTitles() {
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return $this->mInvalidTitles;
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}
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/**
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* Page IDs that were not found in the database
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* @return array of page IDs
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*/
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public function getMissingPageIDs() {
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return $this->mMissingPageIDs;
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}
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/**
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* Get a list of redirect resolutions - maps a title to its redirect
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* target.
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* @return array prefixed_title (string) => prefixed_title (string)
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*/
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public function getRedirectTitles() {
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return $this->mRedirectTitles;
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}
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/**
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* Get a list of title normalizations - maps a title to its normalized
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* version.
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* @return array raw_prefixed_title (string) => prefixed_title (string)
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*/
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public function getNormalizedTitles() {
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return $this->mNormalizedTitles;
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}
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/**
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* Get a list of interwiki titles - maps a title to its interwiki
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* prefix.
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* @return array raw_prefixed_title (string) => interwiki_prefix (string)
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*/
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public function getInterwikiTitles() {
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return $this->mInterwikiTitles;
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}
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/**
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* Get the list of revision IDs (requested with the revids= parameter)
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* @return array revID (int) => pageID (int)
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*/
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public function getRevisionIDs() {
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return $this->mGoodRevIDs;
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}
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/**
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* Revision IDs that were not found in the database
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* @return array of revision IDs
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*/
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public function getMissingRevisionIDs() {
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return $this->mMissingRevIDs;
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}
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/**
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* Returns the number of revisions (requested with revids= parameter)\
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* @return int
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*/
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public function getRevisionCount() {
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return count($this->getRevisionIDs());
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}
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/**
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* Populate the PageSet from the request parameters.
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*/
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public function execute() {
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$this->profileIn();
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$params = $this->extractRequestParams();
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// Only one of the titles/pageids/revids is allowed at the same time
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$dataSource = null;
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if (isset ($params['titles']))
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$dataSource = 'titles';
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if (isset ($params['pageids'])) {
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if (isset ($dataSource))
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$this->dieUsage("Cannot use 'pageids' at the same time as '$dataSource'", 'multisource');
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$dataSource = 'pageids';
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}
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if (isset ($params['revids'])) {
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if (isset ($dataSource))
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$this->dieUsage("Cannot use 'revids' at the same time as '$dataSource'", 'multisource');
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$dataSource = 'revids';
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}
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switch ($dataSource) {
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case 'titles' :
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$this->initFromTitles($params['titles']);
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break;
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case 'pageids' :
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$this->initFromPageIds($params['pageids']);
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break;
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case 'revids' :
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if($this->mResolveRedirects)
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$this->setWarning('Redirect resolution cannot be used together with the revids= parameter. '.
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'Any redirects the revids= point to have not been resolved.');
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$this->mResolveRedirects = false;
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$this->initFromRevIDs($params['revids']);
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break;
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default :
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// Do nothing - some queries do not need any of the data sources.
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break;
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}
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$this->profileOut();
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}
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/**
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* Populate this PageSet from a list of Titles
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* @param $titles array of Title objects
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*/
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public function populateFromTitles($titles) {
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$this->profileIn();
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$this->initFromTitles($titles);
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$this->profileOut();
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}
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/**
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* Populate this PageSet from a list of page IDs
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* @param $pageIDs array of page IDs
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*/
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public function populateFromPageIDs($pageIDs) {
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$this->profileIn();
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$this->initFromPageIds($pageIDs);
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$this->profileOut();
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}
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/**
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* Populate this PageSet from a rowset returned from the database
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* @param $db Database object
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* @param $queryResult Query result object
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*/
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public function populateFromQueryResult($db, $queryResult) {
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$this->profileIn();
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$this->initFromQueryResult($db, $queryResult);
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$this->profileOut();
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}
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/**
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* Populate this PageSet from a list of revision IDs
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* @param $revIDs array of revision IDs
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*/
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public function populateFromRevisionIDs($revIDs) {
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$this->profileIn();
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$this->initFromRevIDs($revIDs);
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$this->profileOut();
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}
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/**
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* Extract all requested fields from the row received from the database
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* @param $row Result row
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*/
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public function processDbRow($row) {
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// Store Title object in various data structures
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$title = Title :: makeTitle($row->page_namespace, $row->page_title);
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$pageId = intval($row->page_id);
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$this->mAllPages[$row->page_namespace][$row->page_title] = $pageId;
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$this->mTitles[] = $title;
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if ($this->mResolveRedirects && $row->page_is_redirect == '1') {
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$this->mPendingRedirectIDs[$pageId] = $title;
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} else {
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$this->mGoodTitles[$pageId] = $title;
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}
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foreach ($this->mRequestedPageFields as $fieldName => & $fieldValues)
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$fieldValues[$pageId] = $row-> $fieldName;
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}
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/**
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* Resolve redirects, if applicable
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*/
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public function finishPageSetGeneration() {
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$this->profileIn();
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$this->resolvePendingRedirects();
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$this->profileOut();
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}
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/**
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* This method populates internal variables with page information
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* based on the given array of title strings.
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*
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* Steps:
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* #1 For each title, get data from `page` table
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* #2 If page was not found in the DB, store it as missing
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*
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* Additionally, when resolving redirects:
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* #3 If no more redirects left, stop.
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* #4 For each redirect, get its target from the `redirect` table.
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* #5 Substitute the original LinkBatch object with the new list
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* #6 Repeat from step #1
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*
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* @param $titles array of Title objects or strings
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*/
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private function initFromTitles($titles) {
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// Get validated and normalized title objects
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$linkBatch = $this->processTitlesArray($titles);
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if($linkBatch->isEmpty())
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return;
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$db = $this->getDB();
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$set = $linkBatch->constructSet('page', $db);
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// Get pageIDs data from the `page` table
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$this->profileDBIn();
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$res = $db->select('page', $this->getPageTableFields(), $set,
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__METHOD__);
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$this->profileDBOut();
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// Hack: get the ns:titles stored in array(ns => array(titles)) format
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$this->initFromQueryResult($db, $res, $linkBatch->data, true); // process Titles
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// Resolve any found redirects
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$this->resolvePendingRedirects();
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}
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/**
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* Does the same as initFromTitles(), but is based on page IDs instead
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* @param $pageids array of page IDs
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*/
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private function initFromPageIds($pageids) {
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if(!count($pageids))
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return;
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$pageids = array_map('intval', $pageids); // paranoia
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$set = array (
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'page_id' => $pageids
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);
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$db = $this->getDB();
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// Get pageIDs data from the `page` table
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$this->profileDBIn();
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$res = $db->select('page', $this->getPageTableFields(), $set,
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__METHOD__);
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$this->profileDBOut();
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$remaining = array_flip($pageids);
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$this->initFromQueryResult($db, $res, $remaining, false); // process PageIDs
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// Resolve any found redirects
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$this->resolvePendingRedirects();
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}
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/**
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* Iterate through the result of the query on 'page' table,
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* and for each row create and store title object and save any extra fields requested.
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* @param $db Database
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* @param $res DB Query result
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* @param $remaining array of either pageID or ns/title elements (optional).
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* If given, any missing items will go to $mMissingPageIDs and $mMissingTitles
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* @param $processTitles bool Must be provided together with $remaining.
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* If true, treat $remaining as an array of [ns][title]
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* If false, treat it as an array of [pageIDs]
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*/
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private function initFromQueryResult($db, $res, &$remaining = null, $processTitles = null) {
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if (!is_null($remaining) && is_null($processTitles))
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ApiBase :: dieDebug(__METHOD__, 'Missing $processTitles parameter when $remaining is provided');
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while ($row = $db->fetchObject($res)) {
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$pageId = intval($row->page_id);
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// Remove found page from the list of remaining items
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if (isset($remaining)) {
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if ($processTitles)
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unset ($remaining[$row->page_namespace][$row->page_title]);
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else
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unset ($remaining[$pageId]);
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}
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// Store any extra fields requested by modules
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$this->processDbRow($row);
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}
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$db->freeResult($res);
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if(isset($remaining)) {
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// Any items left in the $remaining list are added as missing
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if($processTitles) {
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// The remaining titles in $remaining are non-existent pages
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foreach ($remaining as $ns => $dbkeys) {
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foreach ( $dbkeys as $dbkey => $unused ) {
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$title = Title :: makeTitle($ns, $dbkey);
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$this->mAllPages[$ns][$dbkey] = $this->mFakePageId;
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$this->mMissingTitles[$this->mFakePageId] = $title;
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$this->mFakePageId--;
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$this->mTitles[] = $title;
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}
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}
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}
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else
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{
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// The remaining pageids do not exist
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if(!$this->mMissingPageIDs)
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$this->mMissingPageIDs = array_keys($remaining);
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else
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$this->mMissingPageIDs = array_merge($this->mMissingPageIDs, array_keys($remaining));
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}
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}
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}
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/**
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* Does the same as initFromTitles(), but is based on revision IDs
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* instead
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* @param $revids array of revision IDs
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*/
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private function initFromRevIDs($revids) {
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if(!count($revids))
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return;
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$revids = array_map('intval', $revids); // paranoia
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$db = $this->getDB();
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$pageids = array();
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$remaining = array_flip($revids);
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$tables = array('revision', 'page');
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$fields = array('rev_id', 'rev_page');
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$where = array('rev_id' => $revids, 'rev_page = page_id');
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// Get pageIDs data from the `page` table
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$this->profileDBIn();
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$res = $db->select($tables, $fields, $where, __METHOD__);
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while ($row = $db->fetchObject($res)) {
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$revid = intval($row->rev_id);
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$pageid = intval($row->rev_page);
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$this->mGoodRevIDs[$revid] = $pageid;
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$pageids[$pageid] = '';
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unset($remaining[$revid]);
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}
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$db->freeResult($res);
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$this->profileDBOut();
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$this->mMissingRevIDs = array_keys($remaining);
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// Populate all the page information
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$this->initFromPageIds(array_keys($pageids));
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}
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/**
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* Resolve any redirects in the result if redirect resolution was
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* requested. This function is called repeatedly until all redirects
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* have been resolved.
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*/
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private function resolvePendingRedirects() {
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if($this->mResolveRedirects) {
|
|
$db = $this->getDB();
|
|
$pageFlds = $this->getPageTableFields();
|
|
|
|
// Repeat until all redirects have been resolved
|
|
// The infinite loop is prevented by keeping all known pages in $this->mAllPages
|
|
while ($this->mPendingRedirectIDs) {
|
|
|
|
// Resolve redirects by querying the pagelinks table, and repeat the process
|
|
// Create a new linkBatch object for the next pass
|
|
$linkBatch = $this->getRedirectTargets();
|
|
|
|
if ($linkBatch->isEmpty())
|
|
break;
|
|
|
|
$set = $linkBatch->constructSet('page', $db);
|
|
if($set === false)
|
|
break;
|
|
|
|
// Get pageIDs data from the `page` table
|
|
$this->profileDBIn();
|
|
$res = $db->select('page', $pageFlds, $set, __METHOD__);
|
|
$this->profileDBOut();
|
|
|
|
// Hack: get the ns:titles stored in array(ns => array(titles)) format
|
|
$this->initFromQueryResult($db, $res, $linkBatch->data, true);
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Get the targets of the pending redirects from the database
|
|
*
|
|
* Also creates entries in the redirect table for redirects that don't
|
|
* have one.
|
|
* @return LinkBatch
|
|
*/
|
|
private function getRedirectTargets() {
|
|
$lb = new LinkBatch();
|
|
$db = $this->getDB();
|
|
|
|
$this->profileDBIn();
|
|
$res = $db->select('redirect', array(
|
|
'rd_from',
|
|
'rd_namespace',
|
|
'rd_title'
|
|
), array('rd_from' => array_keys($this->mPendingRedirectIDs)),
|
|
__METHOD__
|
|
);
|
|
$this->profileDBOut();
|
|
|
|
while($row = $db->fetchObject($res))
|
|
{
|
|
$rdfrom = intval($row->rd_from);
|
|
$from = $this->mPendingRedirectIDs[$rdfrom]->getPrefixedText();
|
|
$to = Title::makeTitle($row->rd_namespace, $row->rd_title)->getPrefixedText();
|
|
unset($this->mPendingRedirectIDs[$rdfrom]);
|
|
if(!isset($this->mAllPages[$row->rd_namespace][$row->rd_title]))
|
|
$lb->add($row->rd_namespace, $row->rd_title);
|
|
$this->mRedirectTitles[$from] = $to;
|
|
}
|
|
$db->freeResult($res);
|
|
if($this->mPendingRedirectIDs)
|
|
{
|
|
# We found pages that aren't in the redirect table
|
|
# Add them
|
|
foreach($this->mPendingRedirectIDs as $id => $title)
|
|
{
|
|
$article = new Article($title);
|
|
$rt = $article->insertRedirect();
|
|
if(!$rt)
|
|
# What the hell. Let's just ignore this
|
|
continue;
|
|
$lb->addObj($rt);
|
|
$this->mRedirectTitles[$title->getPrefixedText()] = $rt->getPrefixedText();
|
|
unset($this->mPendingRedirectIDs[$id]);
|
|
}
|
|
}
|
|
return $lb;
|
|
}
|
|
|
|
/**
|
|
* Given an array of title strings, convert them into Title objects.
|
|
* Alternativelly, an array of Title objects may be given.
|
|
* This method validates access rights for the title,
|
|
* and appends normalization values to the output.
|
|
*
|
|
* @param $titles array of Title objects or strings
|
|
* @return LinkBatch
|
|
*/
|
|
private function processTitlesArray($titles) {
|
|
|
|
$linkBatch = new LinkBatch();
|
|
|
|
foreach ($titles as $title) {
|
|
|
|
$titleObj = is_string($title) ? Title :: newFromText($title) : $title;
|
|
if (!$titleObj)
|
|
{
|
|
# Handle invalid titles gracefully
|
|
$this->mAllpages[0][$title] = $this->mFakePageId;
|
|
$this->mInvalidTitles[$this->mFakePageId] = $title;
|
|
$this->mFakePageId--;
|
|
continue; // There's nothing else we can do
|
|
}
|
|
$iw = $titleObj->getInterwiki();
|
|
if (strval($iw) !== '') {
|
|
// This title is an interwiki link.
|
|
$this->mInterwikiTitles[$titleObj->getPrefixedText()] = $iw;
|
|
} else {
|
|
|
|
// Validation
|
|
if ($titleObj->getNamespace() < 0)
|
|
$this->setWarning("No support for special pages has been implemented");
|
|
else
|
|
$linkBatch->addObj($titleObj);
|
|
}
|
|
|
|
// Make sure we remember the original title that was
|
|
// given to us. This way the caller can correlate new
|
|
// titles with the originally requested when e.g. the
|
|
// namespace is localized or the capitalization is
|
|
// different
|
|
if (is_string($title) && $title !== $titleObj->getPrefixedText()) {
|
|
$this->mNormalizedTitles[$title] = $titleObj->getPrefixedText();
|
|
}
|
|
}
|
|
|
|
return $linkBatch;
|
|
}
|
|
|
|
protected function getAllowedParams() {
|
|
return array (
|
|
'titles' => array (
|
|
ApiBase :: PARAM_ISMULTI => true
|
|
),
|
|
'pageids' => array (
|
|
ApiBase :: PARAM_TYPE => 'integer',
|
|
ApiBase :: PARAM_ISMULTI => true
|
|
),
|
|
'revids' => array (
|
|
ApiBase :: PARAM_TYPE => 'integer',
|
|
ApiBase :: PARAM_ISMULTI => true
|
|
)
|
|
);
|
|
}
|
|
|
|
protected function getParamDescription() {
|
|
return array (
|
|
'titles' => 'A list of titles to work on',
|
|
'pageids' => 'A list of page IDs to work on',
|
|
'revids' => 'A list of revision IDs to work on'
|
|
);
|
|
}
|
|
|
|
public function getVersion() {
|
|
return __CLASS__ . ': $Id$';
|
|
}
|
|
}
|