Special page to direct the user to a random page. More...

Inheritance diagram for SpecialRandomInCategory:

Collaboration diagram for SpecialRandomInCategory:

Public Member Functions
	__construct ( $name='RandomInCategory')

	execute ( $par)
	Default execute method Checks user permissions, calls the function given in mFunction. More...

	getRandomTitle ()
	Choose a random title. More...

	setCategory (Title $cat)
	Set which category to use. More...

Public Member Functions inherited from SpecialPage
	__construct ( $name='', $restriction='', $listed=true, $function=false, $file='default', $includable=false)
	Default constructor for special pages Derivative classes should call this from their constructor Note that if the user does not have the required level, an error message will be displayed by the default execute() method, without the global function ever being called. More...

	checkPermissions ()
	Checks if userCanExecute, and if not throws a PermissionsError. More...

	checkReadOnly ()
	If the wiki is currently in readonly mode, throws a ReadOnlyError. More...

	displayRestrictionError ()
	Output an error message telling the user what access level they have to have. More...

	getContext ()
	Gets the context this SpecialPage is executed in. More...

	getDescription ()
	Returns the name that goes in the <h1> in the special page itself, and also the name that will be listed in Special:Specialpages. More...

	getFile ()
	Get the file which will be included by SpecialPage::execute() if your extension is still stuck in the past and hasn't overridden the execute() method. More...

	getFinalGroupName ()
	Get the group that the special page belongs in on Special:SpecialPage Use this method, instead of getGroupName to allow customization of the group name from the wiki side. More...

	getFullTitle ()
	Return the full title, including $par. More...

	getLang ()
	Shortcut to get user's language. More...

	getLanguage ()
	Shortcut to get user's language. More...

	getLocalName ()
	Get the localised name of the special page. More...

	getName ()
	Get the name of this Special Page. More...

	getOutput ()
	Get the OutputPage being used for this instance. More...

	getPageTitle ( $subpage=false)
	Get a self-referential title object. More...

	getRequest ()
	Get the WebRequest being used for this instance. More...

	getRestriction ()
	Get the permission that a user must have to execute this page. More...

	getSkin ()
	Shortcut to get the skin being used for this instance. More...

	getTitle ( $subpage=false)
	Get a self-referential title object. More...

	getUser ()
	Shortcut to get the User executing this instance. More...

	including ( $x=null)
	Whether the special page is being evaluated via transclusion. More...

	isCached ()
	Is this page cached? Expensive pages are cached or disabled in miser mode. More...

	isExpensive ()
	Is this page expensive (for some definition of expensive)? Expensive pages are disabled or cached in miser mode. More...

	isIncludable ()
	Whether it's allowed to transclude the special page via {{Special:Foo/params}}. More...

	isListed ()
	Whether this special page is listed in Special:SpecialPages. More...

	isRestricted ()
	Can be overridden by subclasses with more complicated permissions schemes. More...

	listed ( $x=null)
	Get or set whether this special page is listed in Special:SpecialPages. More...

	msg ()
	Wrapper around wfMessage that sets the current context. More...

	outputHeader ( $summaryMessageKey='')
	Outputs a summary message on top of special pages Per default the message key is the canonical name of the special page May be overridden, i.e. More...

	requireLogin ( $reasonMsg=null, $titleMsg=null)
	If the user is not logged in, throws UserNotLoggedIn error. More...

	run ( $subPage)
	Entry point. More...

	setContext ( $context)
	Sets the context this SpecialPage is executed in. More...

	setHeaders ()
	Sets headers - this should be called from the execute() method of all derived classes! More...

	setListed ( $listed)
	Set whether this page is listed in Special:Specialpages, at run-time. More...

	userCanExecute (User $user)
	Checks if the given user (identified by an object) can execute this special page (as defined by $mRestriction). More...

Protected Member Functions
	getGroupName ()
	Under which header this special page is listed in Special:SpecialPages See messages 'specialpages-group-*' for valid names This method defaults to group 'other'. More...

	getMinAndMaxForCat (Title $category)
	Get the lowest and highest timestamp for a category. More...

	getQueryInfo ( $rand, $offset, $up)

	getTimestampOffset ( $rand)

Protected Member Functions inherited from SpecialPage
	addFeedLinks ( $params)
	Adds RSS/atom links. More...

	afterExecute ( $subPage)
	Gets called after. More...

	beforeExecute ( $subPage)
	Gets called before. More...

	getRobotPolicy ()
	Return the robot policy. More...

Protected Attributes
	$category = false

	$extra = array()

	$maxOffset = 30

Protected Attributes inherited from SpecialPage
IContextSource	$mContext
	Current request context. More...

	$mIncludable

	$mIncluding

	$mName

Private Member Functions
	selectRandomPageFromDB ( $rand, $offset, $up, $fname=__METHOD__)

Private Attributes
	$maxTimestamp = null

	$minTimestamp = null

Additional Inherited Members
Static Public Member Functions inherited from SpecialPage
static	getSafeTitleFor ( $name, $subpage=false)
	Get a localised Title object for a page name with a possibly unvalidated subpage. More...

static	getTitleFor ( $name, $subpage=false, $fragment='')
	Get a localised Title object for a specified special page name. More...

Detailed Description

Special page to direct the user to a random page.

Note: The method used here is rather biased. It is assumed that the use of this page will be people wanting to get a random page out of a maintenance category, to fix it up. The method used by this page should return different pages in an unpredictable fashion which is hoped to be sufficient, even if some pages are selected more often than others.

A more unbiased method could be achieved by adding a cl_random field to the categorylinks table.

The method used here is as follows:

Find the smallest and largest timestamp in the category
Pick a random timestamp in between
Pick an offset between 0 and 30
Get the offset'ed page that is newer than the timestamp selected The offset is meant to counter the fact the timestamps aren't usually uniformly distributed, so if things are very non-uniform at least we won't have the same page selected 99% of the time.

Definition at line 49 of file SpecialRandomInCategory.php.

Constructor & Destructor Documentation

◆ __construct()

SpecialRandomInCategory::__construct ( $name = 'RandomInCategory' )

Definition at line 56 of file SpecialRandomInCategory.php.

References $name.

Member Function Documentation

◆ execute()

SpecialRandomInCategory::execute ( $subPage )

Default execute method Checks user permissions, calls the function given in mFunction.

This must be overridden by subclasses; it will be made abstract in a future version

Parameters

string | null $subPage

Reimplemented from SpecialPage.

Definition at line 70 of file SpecialRandomInCategory.php.

References $form, $query, $title, array(), SpecialPage\getOutput(), SpecialPage\getPageTitle(), getRandomTitle(), SpecialPage\getRequest(), global, Html\hidden(), Html\input(), Title\makeTitleSafe(), SpecialPage\msg(), Title\newFromText(), NS_CATEGORY, Html\rawElement(), setCategory(), SpecialPage\setHeaders(), and wfEscapeWikiText().

◆ getGroupName()

SpecialRandomInCategory::getGroupName ( )

protected

Under which header this special page is listed in Special:SpecialPages See messages 'specialpages-group-*' for valid names This method defaults to group 'other'.

Returns: string

Since: 1.21

Reimplemented from SpecialPage.

Definition at line 290 of file SpecialRandomInCategory.php.

◆ getMinAndMaxForCat()

SpecialRandomInCategory::getMinAndMaxForCat ( Title $category )

protected

Get the lowest and highest timestamp for a category.

Parameters

Title $category

Returns: Array The lowest and highest timestamp

Exceptions

MWException if category has no entries.

Definition at line 244 of file SpecialRandomInCategory.php.

References $dbr, $res, array(), DB_SLAVE, TS_UNIX, wfGetDB(), and wfTimestamp().

Referenced by getTimestampOffset().

◆ getQueryInfo()

SpecialRandomInCategory::getQueryInfo	(	$rand,
		$offset,
		$up
	)

protected

Parameters

float	$rand	Random number between 0 and 1
int	$offset	Extra offset to fudge randomness
bool	$up	True to get the result above the random number, false for below

Note: The $up parameter is supposed to counteract what would happen if there was a large gap in the distribution of cl_timestamp values. This way instead of things to the right of the gap being favoured, both sides of the gap are favoured.

Returns: Array Query information.

Definition at line 182 of file SpecialRandomInCategory.php.

References $dbr, $dir, array(), DB_SLAVE, getTimestampOffset(), and wfGetDB().

Referenced by selectRandomPageFromDB().

◆ getRandomTitle()

SpecialRandomInCategory::getRandomTitle ( )

Choose a random title.

Returns: Title object (or null if nothing to choose from)

Definition at line 132 of file SpecialRandomInCategory.php.

References $title, Title\makeTitle(), selectRandomPageFromDB(), and wfRandom().

Referenced by execute().

◆ getTimestampOffset()

SpecialRandomInCategory::getTimestampOffset ( $rand )

protected

Parameters

float $rand Random number between 0 and 1

Returns: int|bool A random (unix) timestamp from the range of the category or false on failure

Definition at line 219 of file SpecialRandomInCategory.php.

References $e, $minTimestamp, getMinAndMaxForCat(), and list.

Referenced by getQueryInfo().

◆ selectRandomPageFromDB()

SpecialRandomInCategory::selectRandomPageFromDB	(	$rand,
		$offset,
		$up,
		$fname = `__METHOD__`
	)

private

Parameters

float	$rand	A random number that is converted to a random timestamp
int	$offset	A small offset to make the result seem more "random"
bool	$up	Get the result above the random value
String	$fname	The name of the calling method