Class HelperRegistry

HelperRegistry is used as a registry for loaded helpers and handles loading and constructing helper class objects.

Namespace: Cake\View

Properties summary

  • $_View protected
    \Cake\View\View

    View object to use when making helpers.

  • $_eventClass protected
    string

    Default class name for new event objects.

  • $_eventManager protected
    \Cake\Event\EventManagerInterface

    Instance of the Cake\Event\EventManager this object is using to dispatch inner events.

  • $_loaded protected
    object[]

    Map of loaded objects.

Method Summary

  • __construct() public

    Constructor

  • __debugInfo() public

    Debug friendly object properties.

  • __get() public

    Provide public read access to the loaded objects

  • __isset() public

    Tries to lazy load a helper based on its name, if it cannot be found in the application folder, then it tries looking under the current plugin if any

  • __set() public

    Sets an object.

  • __unset() public

    Unsets an object.

  • _checkDuplicate() protected

    Check for duplicate object loading.

  • _create() protected

    Create the helper instance.

  • _resolveClassName() protected

    Resolve a helper classname.

  • _throwMissingClassError() protected

    Throws an exception when a helper is missing.

  • count() public

    Returns the number of loaded objects.

  • dispatchEvent() public

    Wrapper for creating and dispatching events.

  • get() public

    Get loaded object instance.

  • getEventManager() public

    Returns the Cake\Event\EventManager manager instance for this object.

  • getIterator() public

    Returns an array iterator.

  • has() public

    Check whether or not a given object is loaded.

  • load() public

    Loads/constructs an object instance.

  • loaded() public

    Get the list of loaded objects.

  • normalizeArray() public

    Normalizes an object array, creates an array that makes lazy loading easier

  • reset() public

    Clear loaded instances in the registry.

  • set() public

    Set an object directly into the registry by name.

  • setEventManager() public

    Returns the Cake\Event\EventManagerInterface instance for this object.

  • unload() public

    Remove an object from the registry.

Method Detail

__construct() public 

__construct(\Cake\View\View $view)

Constructor

Parameters

\Cake\View\View $view

View object.

__debugInfo() public 

__debugInfo()

Debug friendly object properties.

Returns

array

__get() public 

__get(string $name)

Provide public read access to the loaded objects

Parameters

string $name

Name of property to read

Returns

\Cake\View\Helper|null

__isset() public 

__isset(string $helper)

Tries to lazy load a helper based on its name, if it cannot be found in the application folder, then it tries looking under the current plugin if any

Parameters

string $helper

The helper name to be loaded

Returns

bool

whether the helper could be loaded or not

Throws

Cake\View\Exception\MissingHelperException
When a helper could not be found. App helpers are searched, and then plugin helpers.

__set() public 

__set(string $name, mixed $object)

Sets an object.

Parameters

string $name

Name of a property to set.

object $object

Object to set.

__unset() public 

__unset(string $name)

Unsets an object.

Parameters

string $name

Name of a property to unset.

_checkDuplicate() protected 

_checkDuplicate(string $name, array $config)

Check for duplicate object loading.

If a duplicate is being loaded and has different configuration, that is bad and an exception will be raised.

An exception is raised, as replacing the object will not update any references other objects may have. Additionally, simply updating the runtime configuration is not a good option as we may be missing important constructor logic dependent on the configuration.

Parameters

string $name

The name of the alias in the registry.

array $config

The config data for the new instance.

Throws

RuntimeException
When a duplicate is found.

_create() protected 

_create(mixed $class, string $alias, array $config)

Create the helper instance.

Part of the template method for Cake\Core\ObjectRegistry::load() Enabled helpers will be registered with the event manager.

Parameters

string $class

The class to create.

string $alias

The alias of the loaded helper.

array $config

An array of settings to use for the helper.

Returns

\Cake\View\Helper

The constructed helper class.

_resolveClassName() protected 

_resolveClassName(string $class)

Resolve a helper classname.

Part of the template method for Cake\Core\ObjectRegistry::load()

Parameters

string $class

Partial classname to resolve.

Returns

string|null

Either the correct class name or null.

_throwMissingClassError() protected 

_throwMissingClassError(string $class, ?string $plugin)

Throws an exception when a helper is missing.

Part of the template method for Cake\Core\ObjectRegistry::load() and Cake\Core\ObjectRegistry::unload()

Parameters

string $class

The classname that is missing.

string|null $plugin

The plugin the helper is missing in.

Throws

Cake\View\Exception\MissingHelperException

count() public 

count()

Returns the number of loaded objects.

Returns

int

dispatchEvent() public 

dispatchEvent(string $name, ?array $data, ?object $subject)

Wrapper for creating and dispatching events.

Returns a dispatched event.

Parameters

string $name

Name of the event.

array|null $data optional

Any value you wish to be transported with this event to it can be read by listeners.

object|null $subject optional

The object that this event applies to ($this by default).

Returns

\Cake\Event\EventInterface

get() public 

get(string $name)

Get loaded object instance.

Parameters

string $name

Name of object.

Returns

object

Object instance.

Throws

RuntimeException
If not loaded or found.

getEventManager() public 

getEventManager()

Returns the Cake\Event\EventManager manager instance for this object.

You can use this instance to register any new listeners or callbacks to the object events, or create your own events and trigger them at will.

Returns

\Cake\Event\EventManagerInterface

getIterator() public 

getIterator()

Returns an array iterator.

Returns

\Traversable

has() public 

has(string $name)

Check whether or not a given object is loaded.

Parameters

string $name

The object name to check for.

Returns

bool

True is object is loaded else false.

load() public 

load(string $objectName, array $config)

Loads/constructs an object instance.

Will return the instance in the registry if it already exists. If a subclass provides event support, you can use $config['enabled'] = false to exclude constructed objects from being registered for events.

Using Cake\Controller\Controller::$components as an example. You can alias an object by setting the 'className' key, i.e.,

public $components = [
  'Email' => [
    'className' => '\App\Controller\Component\AliasedEmailComponent'
  ];
];

All calls to the Email component would use AliasedEmail instead.

Parameters

string $objectName

The name/class of the object to load.

array $config optional

Additional settings to use when loading the object.

Returns

mixed

Throws

Exception
If the class cannot be found.

loaded() public 

loaded()

Get the list of loaded objects.

Returns

string[]

List of object names.

normalizeArray() public 

normalizeArray(array $objects)

Normalizes an object array, creates an array that makes lazy loading easier

Parameters

array $objects

Array of child objects to normalize.

Returns

array[]

Array of normalized objects.

reset() public 

reset()

Clear loaded instances in the registry.

If the registry subclass has an event manager, the objects will be detached from events as well.

Returns

$this

set() public 

set(string $objectName, object $object)

Set an object directly into the registry by name.

If this collection implements events, the passed object will be attached into the event manager

Parameters

string $objectName

The name of the object to set in the registry.

object $object

instance to store in the registry

Returns

$this

setEventManager() public 

setEventManager(\Cake\Event\EventManagerInterface $eventManager)

Returns the Cake\Event\EventManagerInterface instance for this object.

You can use this instance to register any new listeners or callbacks to the object events, or create your own events and trigger them at will.

Parameters

\Cake\Event\EventManagerInterface $eventManager

the eventManager to set

Returns

$this

unload() public 

unload(string $objectName)

Remove an object from the registry.

If this registry has an event manager, the object will be detached from any events as well.

Parameters

string $objectName

The name of the object to remove from the registry.

Returns

$this

Property Detail

$_View protected

View object to use when making helpers.

Type

\Cake\View\View

$_eventClass protected

Default class name for new event objects.

Type

string

$_eventManager protected

Instance of the Cake\Event\EventManager this object is using to dispatch inner events.

Type

\Cake\Event\EventManagerInterface

$_loaded protected

Map of loaded objects.

Type

object[]

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https://api.cakephp.org/4.1/class-Cake.View.HelperRegistry.html