Inheritance diagram for context_helper:

Public Member Functions
	__get ($name)
	Magic method getter, redirects to read only values. More...

	__isset ($name)
	Full support for isset on our magic read only properties. More...

	__set ($name, $value)
	Magic setter method, we do not want anybody to modify properties from the outside. More...

	__unset ($name)
	All properties are read only, sorry. More...

	delete ()
	Delete the context content and the context record itself.

	delete_capabilities ()
	Unassign all capabilities from a context.

	delete_content ()
	Delete all data linked to content, do not delete the context record itself.

	get_capabilities ()
	not used More...

	get_child_contexts ()
	Recursive function which, given a context, find all its children context ids. More...

	get_context_name ($withprefix=true, $short=false, $escape=true)
	Returns human readable context identifier. More...

	get_course_context ($strict=true)
	Is this context part of any course? If yes return course context. More...

	get_parent_context ()
	Returns parent context. More...

	get_parent_context_ids ($includeself=false)
	Returns parent context ids of this context in reversed order, i.e. More...

	get_parent_context_paths ($includeself=false)
	Returns parent context paths of this context. More...

	get_parent_contexts ($includeself=false)
	Returns parent contexts of this context in reversed order, i.e. More...

	get_url ()
	not used More...

	getIterator ()
	Create an iterator because magic vars can't be seen by 'foreach'. More...

	is_child_of (context $possibleparent, bool $includeself)
	Determine if the current context is a child of the possible parent. More...

	is_locked ()
	Whether the current context is locked. More...

	is_parent_of (context $possiblechild, bool $includeself)
	Determine if the current context is a parent of the possible child. More...

	mark_dirty ()
	Mark a context as dirty (with timestamp) so as to force reloading of the context.

	reload_if_dirty ()
	Reset all cached permissions and definitions if the necessary. More...

	reset_paths ($rebuild=true)
	Remove all context path info and optionally rebuild it. More...

	set_locked (bool $locked)
	Set whether this context has been locked or not. More...

	update_moved (context $newparent)
	Update context info after moving context in the tree structure. More...

Static Public Member Functions
static	build_all_paths ($force=false)
	Rebuild paths and depths in all context levels. More...

static	cleanup_instances ()
	Remove stale contexts that belonged to deleted instances. More...

static	create_instances ($contextlevel=null, $buildpaths=true)
	Create all context instances at the given level and above. More...

static	delete_instance ($contextlevel, $instanceid)
	Delete context instance. More...

static	get_all_levels ()
	Returns a list of all context levels. More...

static	get_class_for_level ($contextlevel)
	Returns a class name of the context level class. More...

static	get_level_name ($contextlevel)
	Returns the name of specified context level. More...

static	get_preload_record_columns ($tablealias)
	Returns all fields necessary for context preloading from user $rec. More...

static	get_preload_record_columns_sql ($tablealias)
	Returns all fields necessary for context preloading from user $rec. More...

static	instance_by_id ($id, $strictness=MUST_EXIST)
	Get a context instance as an object, from a given context id. More...

static	preload_contexts_by_id (array $contextids)
	Preload a set of contexts using their contextid. More...

static	preload_course ($courseid)
	Preload all contexts instances from course. More...

static	preload_from_record (stdClass $rec)
	Preloads context information from db record and strips the cached info. More...

static	reset_caches ()
	Resets the cache to remove all data. More...

static	reset_levels ()
	Reset internal context levels array.

Protected Member Functions
	__construct ()
	Instance does not make sense here, only static use.

Static Protected Member Functions
static	build_paths ($force)
	Rebuild context paths and depths at context level. More...

static	cache_add (context $context)
	Adds a context to the cache. More...

static	cache_get ($contextlevel, $instance)
	Gets a context from the cache. More...

static	cache_get_by_id ($id)
	Gets a context from the cache based on its id. More...

static	cache_remove (context $context)
	Removes a context from the cache. More...

static	create_instance_from_record (stdClass $record)
	This function is also used to work around 'protected' keyword problems in context_helper. More...

static	create_level_instances ()
	Create missing context instances at given level. More...

static	get_cleanup_sql ()
	Returns sql necessary for purging of stale context instances. More...

static	insert_context_record ($contextlevel, $instanceid, $parentpath)
	Utility method for context creation. More...

static	merge_context_temp_table ()
	Copy prepared new contexts from temp table to context table, we do this in db specific way for perf reasons only.

Protected Attributes
int	$_contextlevel
	The context level Can be accessed publicly through $context->contextlevel One of CONTEXT_* e.g. More...

int	$_depth
	The depth of the context in relation to parent contexts Can be accessed publicly through $context->depth.

int	$_id
	The context id Can be accessed publicly through $context->id.

int	$_instanceid
	Id of the item this context is related to e.g. More...

int	$_locked
	Whether this context is locked or not. More...

string	$_path
	The path to the context always starting from the system context Can be accessed publicly through $context->path.

Static Protected Attributes
static int	$cache_count = 0
	Context count Why do we do count contexts? Because count($array) is horribly slow for large arrays.

static array	$cache_preloaded = array()
	Context caching info.

static context_system	$systemcontext = null
	The system context once initialised.

Member Function Documentation

◆ __get()

context::__get ( $name )

inherited

Magic method getter, redirects to read only values.

Parameters

string $name

Return values

mixed

◆ __isset()

context::__isset ( $name )

inherited

Full support for isset on our magic read only properties.

Parameters

string $name

Return values

bool

◆ __set()

context::__set	(	$name,
		$value
	)

inherited

Magic setter method, we do not want anybody to modify properties from the outside.

Parameters

string	$name
mixed	$value

◆ __unset()

context::__unset ( $name )

inherited

All properties are read only, sorry.

Parameters

string $name

◆ build_all_paths()

static context_helper::build_all_paths ( $force = false )

static

Rebuild paths and depths in all context levels.

Parameters

bool $force false means add missing only

Return values

void

◆ build_paths()

static context::build_paths ( $force )

staticprotectedinherited

Rebuild context paths and depths at context level.

Parameters

bool $force

Return values

void

Reimplemented in context_system, context_user, context_coursecat, context_course, context_module, and context_block.

◆ cache_add()

static context::cache_add ( context $context )

staticprotectedinherited

Adds a context to the cache.

If the cache is full, discards a batch of older entries.

Parameters

context $context New context to add

Return values

void

◆ cache_get()

static context::cache_get	(	$contextlevel,
		$instance
	)

staticprotectedinherited

Gets a context from the cache.

Parameters

int	$contextlevel	Context level
int	$instance	Instance ID

Return values

context|bool Context or false if not in cache

◆ cache_get_by_id()

static context::cache_get_by_id ( $id )

staticprotectedinherited

Gets a context from the cache based on its id.

Parameters

int $id Context ID

Return values

context|bool Context or false if not in cache

◆ cache_remove()

static context::cache_remove ( context $context )

staticprotectedinherited

Removes a context from the cache.

Parameters

context $context Context object to remove

Return values

void

◆ cleanup_instances()

static context_helper::cleanup_instances ( )

static

Remove stale contexts that belonged to deleted instances.

Ideally all code should cleanup contexts properly, unfortunately accidents happen...

Return values

void

◆ create_instance_from_record()

static context::create_instance_from_record ( stdClass $record )

staticprotectedinherited

This function is also used to work around 'protected' keyword problems in context_helper.

Parameters

stdClass $record

Return values

context instance

◆ create_instances()

static context_helper::create_instances	(	$contextlevel = `null`,
		$buildpaths = `true`
	)

static

Create all context instances at the given level and above.

Parameters

int	$contextlevel	null means all levels
bool	$buildpaths

Return values

void

◆ create_level_instances()

static context::create_level_instances ( )

staticprotectedinherited

Create missing context instances at given level.

Return values

void

Reimplemented in context_system, context_user, context_coursecat, context_course, context_module, and context_block.

◆ delete_instance()

static context_helper::delete_instance	(	$contextlevel,
		$instanceid
	)

static

Delete context instance.

Parameters

int	$contextlevel
int	$instanceid

Return values

void

◆ get_all_levels()

static context_helper::get_all_levels ( )

static

Returns a list of all context levels.

Return values

array int=>string (level=>level class name)

◆ get_capabilities()

context_helper::get_capabilities ( )

not used

Reimplemented from context.

◆ get_child_contexts()

context::get_child_contexts ( )

inherited

Recursive function which, given a context, find all its children context ids.

For course category contexts it will return immediate children and all subcategory contexts. It will NOT recurse into courses or subcategories categories. If you want to do that, call it on the returned courses/categories.

When called for a course context, it will return the modules and blocks displayed in the course page and blocks displayed on the module pages.

If called on a user/course/module context it will populate the cache with the appropriate contexts ;-)

Return values

array Array of child records

Reimplemented in context_system, context_coursecat, and context_block.

◆ get_class_for_level()

static context_helper::get_class_for_level ( $contextlevel )

static

Returns a class name of the context level class.

Parameters

int $contextlevel (CONTEXT_SYSTEM, etc.)

Return values

string class name of the context class

◆ get_cleanup_sql()

static context::get_cleanup_sql ( )

staticprotectedinherited

Returns sql necessary for purging of stale context instances.

Return values

string cleanup SQL

Reimplemented in context_system, context_user, context_coursecat, context_course, context_module, and context_block.

◆ get_context_name()

context::get_context_name	(	$withprefix = `true`,
		$short = `false`,
		$escape = `true`
	)

inherited

Returns human readable context identifier.

Parameters

boolean	$withprefix	whether to prefix the name of the context with the type of context, e.g. User, Course, Forum, etc.
boolean	$short	whether to use the short name of the thing. Only applies to course contexts
boolean	$escape	Whether the returned name of the thing is to be HTML escaped or not.

Return values

string the human readable context name.

Reimplemented in context_system, context_user, context_coursecat, context_course, context_module, and context_block.

◆ get_course_context()

context::get_course_context ( $strict = true )

inherited

Is this context part of any course? If yes return course context.

Parameters

bool $strict true means throw exception if not found, false means return false if not found

Return values

context_course context of the enclosing course, null if not found or exception

Reimplemented in context_course, context_module, and context_block.

◆ get_level_name()

static context_helper::get_level_name ( $contextlevel )

static

Returns the name of specified context level.

Parameters

int $contextlevel

Return values

string name of the context level

◆ get_parent_context()

context::get_parent_context ( )

inherited

Returns parent context.

Return values

context

◆ get_parent_context_ids()

context::get_parent_context_ids ( $includeself = false )

inherited

Returns parent context ids of this context in reversed order, i.e.

parent first, then grand parent, etc.

Parameters

bool $includeself true means include self too

Return values

array of context ids

◆ get_parent_context_paths()

context::get_parent_context_paths ( $includeself = false )

inherited

Returns parent context paths of this context.

Parameters

bool $includeself true means include self too

Return values

array of context paths

◆ get_parent_contexts()

context::get_parent_contexts ( $includeself = false )

inherited

Returns parent contexts of this context in reversed order, i.e.

parent first, then grand parent, etc.

Parameters

bool $includeself true means include self too

Return values

array of context instances

◆ get_preload_record_columns()

static context_helper::get_preload_record_columns ( $tablealias )

static

Returns all fields necessary for context preloading from user $rec.

This helps with performance when dealing with hundreds of contexts.

Parameters

string $tablealias context table alias in the query

Return values

array (table.column=>alias, ...)

◆ get_preload_record_columns_sql()

static context_helper::get_preload_record_columns_sql ( $tablealias )

static

Returns all fields necessary for context preloading from user $rec.

This helps with performance when dealing with hundreds of contexts.

Parameters

string $tablealias context table alias in the query

Return values

string

◆ get_url()

context_helper::get_url ( )

not used

Reimplemented from context.

◆ getIterator()

context::getIterator ( )

inherited

Create an iterator because magic vars can't be seen by 'foreach'.

Now we can convert context object to array using convert_to_array(), and feed it properly to json_encode().

◆ insert_context_record()

static context::insert_context_record	(	$contextlevel,
		$instanceid,
		$parentpath
	)

staticprotectedinherited

Utility method for context creation.

Parameters

int	$contextlevel
int	$instanceid
string	$parentpath

Return values

stdClass context record

◆ instance_by_id()

static context::instance_by_id	(	$id,
		$strictness = `MUST_EXIST`
	)

staticinherited

Get a context instance as an object, from a given context id.

Parameters

int	$id	context id
int	$strictness	IGNORE_MISSING means compatible mode, false returned if record not found, debug message if more found; MUST_EXIST means throw exception if no record found

Return values

context|bool the context object or false if not found

◆ is_child_of()

context::is_child_of	(	context	$possibleparent,
		bool	$includeself
	)

inherited

Determine if the current context is a child of the possible parent.

Parameters

context	$possibleparent
bool	$includeself	Whether to check the current context

Return values

bool

◆ is_locked()

context::is_locked ( )

inherited

Whether the current context is locked.

Return values

bool

◆ is_parent_of()

context::is_parent_of	(	context	$possiblechild,
		bool	$includeself
	)

inherited

Determine if the current context is a parent of the possible child.

Parameters

context	$possiblechild
bool	$includeself	Whether to check the current context

Return values

bool

◆ preload_contexts_by_id()

static context_helper::preload_contexts_by_id ( array $contextids )

static

Preload a set of contexts using their contextid.

Parameters

array $contextids

◆ preload_course()

static context_helper::preload_course ( $courseid )

static

Preload all contexts instances from course.

To be used if you expect multiple queries for course activities...

Parameters

int $courseid

◆ preload_from_record()

static context_helper::preload_from_record ( stdClass $rec )

static

Preloads context information from db record and strips the cached info.

The db request has to contain all columns from context_helper::get_preload_record_columns().

Parameters

stdClass $rec

Return values

void	(modifies $rec)

Reimplemented from context.

◆ reload_if_dirty()

context::reload_if_dirty ( )

inherited

Reset all cached permissions and definitions if the necessary.

Return values

void

◆ reset_caches()

static context_helper::reset_caches ( )

static

Resets the cache to remove all data.

Reimplemented from context.

◆ reset_paths()

context::reset_paths ( $rebuild = true )

inherited

Remove all context path info and optionally rebuild it.

Parameters

bool $rebuild

Return values

void

◆ set_locked()

context::set_locked ( bool $locked )

inherited

Set whether this context has been locked or not.

Parameters

bool $locked

Return values

$this

Reimplemented in context_system.

◆ update_moved()

context::update_moved ( context $newparent )

inherited

Update context info after moving context in the tree structure.

Parameters

context $newparent

Return values

void

Member Data Documentation

◆ $_contextlevel

int context::$_contextlevel

protectedinherited

The context level Can be accessed publicly through $context->contextlevel One of CONTEXT_* e.g.

CONTEXT_COURSE, CONTEXT_MODULE

◆ $_instanceid

int context::$_instanceid

protectedinherited

Id of the item this context is related to e.g.

COURSE_CONTEXT => course.id Can be accessed publicly through $context->instanceid

◆ $_locked

int context::$_locked

protectedinherited

Whether this context is locked or not.

Can be accessed publicly through $context->locked.

The documentation for this class was generated from the following file:

lib/accesslib.php

Public Member Functions

Static Public Member Functions

Protected Member Functions

Static Protected Member Functions

Protected Attributes

Static Protected Attributes

Member Function Documentation

◆ __get()

◆ __isset()

◆ __set()

◆ __unset()

◆ build_all_paths()

◆ build_paths()

◆ cache_add()

◆ cache_get()

◆ cache_get_by_id()

◆ cache_remove()

◆ cleanup_instances()

◆ create_instance_from_record()

◆ create_instances()

◆ create_level_instances()

◆ delete_instance()

◆ get_all_levels()

◆ get_capabilities()

◆ get_child_contexts()

◆ get_class_for_level()

◆ get_cleanup_sql()

◆ get_context_name()

◆ get_course_context()

◆ get_level_name()

◆ get_parent_context()

◆ get_parent_context_ids()

◆ get_parent_context_paths()

◆ get_parent_contexts()

◆ get_preload_record_columns()

◆ get_preload_record_columns_sql()

◆ get_url()

◆ getIterator()

◆ insert_context_record()

◆ instance_by_id()

◆ is_child_of()

◆ is_locked()

◆ is_parent_of()

◆ preload_contexts_by_id()

◆ preload_course()

◆ preload_from_record()

◆ reload_if_dirty()

◆ reset_caches()

◆ reset_paths()

◆ set_locked()

◆ update_moved()

Member Data Documentation

◆ $_contextlevel

◆ $_instanceid

◆ $_locked