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Behavior.php
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Behavior.php
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<?php
/**
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @since 3.0.0
* @license http://www.opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\ORM;
use Cake\Core\InstanceConfigTrait;
use Cake\Error\Exception;
use Cake\Event\EventListener;
/**
* Base class for behaviors.
*
* Behaviors allow you to simulate mixins, and create
* reusable blocks of application logic, that can be reused across
* several models. Behaviors also provide a way to hook into model
* callbacks and augment their behavior.
*
* ### Mixin methods
*
* Behaviors can provide mixin like features by declaring public
* methods. These methods will be accessible on the tables the
* behavior has been added to.
*
* {{{
* function doSomething($arg1, $arg2) {
* // do something
* }
* }}}
*
* Would be called like `$table->doSomething($arg1, $arg2);`.
*
* ## Callback methods
*
* Behaviors can listen to any events fired on a Table. By default
* CakePHP provides a number of lifecycle events your behaviors can
* listen to:
*
* - `beforeFind(Event $event, Query $query)`
* Fired before a query is converted into SQL.
*
* - `beforeDelete(Event $event, Entity $entity)`
* Fired before an entity is deleted.
*
* - `afterDelete(Event $event, Entity $entity)`
* Fired after an entity has been deleted. The entity parameter
* will contain the entity state from before it was deleted.
*
* - `beforeSave(Event $event, Entity $entity)`
* Fired before an entity is saved. In the case where
* multiple entities are being saved, one event will be fired
* for each entity.
*
* - `afterSave(Event $event, Entity $entity)`
* Fired after an entity is saved. The saved entity will be provided
* as a parameter.
*
* In addition to the core events, behaviors can respond to any
* event fired from your Table classes including custom application
* specific ones.
*
* You can set the priority of a behaviors callbacks by using the
* `priority` setting when attaching a behavior. This will set the
* priority for all the callbacks a behavior provides.
*
* ## Finder methods
*
* Behaviors can provide finder methods that hook into a Table's
* find() method. Custom finders are a great way to provide preset
* queries that relate to your behavior. For example a SluggableBehavior
* could provide a find('slugged') finder. Behavior finders
* are implemented the same as other finders. Any method
* starting with `find` will be setup as a finder. Your finder
* methods should expect the following arguments:
*
* {{{
* findSlugged(Query $query, array $options)
* }}}
*
* @see \Cake\ORM\Table::addBehavior()
* @see \Cake\Event\EventManager
*/
class Behavior implements EventListener {
use InstanceConfigTrait;
/**
* Reflection method cache for behaviors.
*
* Stores the reflected method + finder methods per class.
* This prevents reflecting the same class multiple times in a single process.
*
* @var array
*/
protected static $_reflectionCache = [];
/**
* Default configuration
*
* These are merged with user-provided configuration when the behavior is used.
*
* @var array
*/
protected $_defaultConfig = [];
/**
* Constructor
*
* Merge config with the default and store in the config property
*
* Does not retain a reference to the Table object. If you need this
* you should override the constructor.
*
* @param Table $table The table this behavior is attached to.
* @param array $config The config for this behavior.
*/
public function __construct(Table $table, array $config = []) {
$config = $this->_resolveMethodAliases(
'implementedFinders',
$this->_defaultConfig,
$config
);
$config = $this->_resolveMethodAliases(
'implementedMethods',
$this->_defaultConfig,
$config
);
$this->config($config);
}
/**
* Removes aliased methods that would otherwise be duplicated by userland configuration.
*
* @param string $key The key to filter.
* @param array $defaults The default method mappings.
* @param array $config The customized method mappings.
* @return array A de-duped list of config data.
*/
protected function _resolveMethodAliases($key, $defaults, $config) {
if (!isset($defaults[$key], $config[$key])) {
return $config;
}
if (isset($config[$key]) && $config[$key] === []) {
$this->config($key, [], false);
unset($config[$key]);
return $config;
}
$indexed = array_flip($defaults[$key]);
$indexedCustom = array_flip($config[$key]);
foreach ($indexed as $method => $alias) {
if (!isset($indexedCustom[$method])) {
$indexedCustom[$method] = $alias;
}
}
$this->config($key, array_flip($indexedCustom), false);
unset($config[$key]);
return $config;
}
/**
* verifyConfig
*
* Check that implemented* keys contain values pointing at callable.
*
* @return void
* @throws \Cake\Error\Exception if config are invalid
*/
public function verifyConfig() {
$keys = ['implementedFinders', 'implementedMethods'];
foreach ($keys as $key) {
if (!isset($this->_config[$key])) {
continue;
}
foreach ($this->_config[$key] as $method) {
if (!is_callable([$this, $method])) {
throw new Exception(sprintf('The method %s is not callable on class %s', $method, get_class($this)));
}
}
}
}
/**
* Get the Model callbacks this behavior is interested in.
*
* By defining one of the callback methods a behavior is assumed
* to be interested in the related event.
*
* Override this method if you need to add non-conventional event listeners.
* Or if you want your behavior to listen to non-standard events.
*
* @return array
*/
public function implementedEvents() {
$eventMap = [
'Model.beforeFind' => 'beforeFind',
'Model.beforeSave' => 'beforeSave',
'Model.afterSave' => 'afterSave',
'Model.beforeDelete' => 'beforeDelete',
'Model.afterDelete' => 'afterDelete',
];
$config = $this->config();
$priority = isset($config['priority']) ? $config['priority'] : null;
$events = [];
foreach ($eventMap as $event => $method) {
if (!method_exists($this, $method)) {
continue;
}
if ($priority === null) {
$events[$event] = $method;
} else {
$events[$event] = [
'callable' => $method,
'priority' => $priority
];
}
}
return $events;
}
/**
* implementedFinders
*
* provides and alias->methodname map of which finders a behavior implements. Example:
*
* {{{
* [
* 'this' => 'findThis',
* 'alias' => 'findMethodName'
* ]
* }}}
*
* With the above example, a call to `$Table->find('this')` will call `$Behavior->findThis()`
* and a call to `$Table->find('alias')` will call `$Behavior->findMethodName()`
*
* It is recommended, though not required, to define implementedFinders in the config property
* of child classes such that it is not necessary to use reflections to derive the available
* method list. See core behaviors for examples
*
* @return array
*/
public function implementedFinders() {
$methods = $this->config('implementedFinders');
if (isset($methods)) {
return $methods;
}
return $this->_reflectionCache()['finders'];
}
/**
* implementedMethods
*
* provides an alias->methodname map of which methods a behavior implements. Example:
*
* {{{
* [
* 'method' => 'method',
* 'aliasedmethod' => 'somethingElse'
* ]
* }}}
*
* With the above example, a call to `$Table->method()` will call `$Behavior->method()`
* and a call to `$Table->aliasedmethod()` will call `$Behavior->somethingElse()`
*
* It is recommended, though not required, to define implementedFinders in the config property
* of child classes such that it is not necessary to use reflections to derive the available
* method list. See core behaviors for examples
*
* @return array
*/
public function implementedMethods() {
$methods = $this->config('implementedMethods');
if (isset($methods)) {
return $methods;
}
return $this->_reflectionCache()['methods'];
}
/**
* Get the methods implemented by this behavior
*
* Use the implementedEvents() method to exclude callback methods.
* Methods starting with `_` will be ignored, as will methods
* declared on Cake\ORM\Behavior
*
* @return array
*/
protected function _reflectionCache() {
$class = get_class($this);
if (isset(self::$_reflectionCache[$class])) {
return self::$_reflectionCache[$class];
}
$events = $this->implementedEvents();
$eventMethods = [];
foreach ($events as $e => $binding) {
if (is_array($binding) && isset($binding['callable'])) {
$binding = $binding['callable'];
}
$eventMethods[$binding] = true;
}
$baseClass = 'Cake\ORM\Behavior';
if (isset(self::$_reflectionCache[$baseClass])) {
$baseMethods = self::$_reflectionCache[$baseClass];
} else {
$baseMethods = get_class_methods($baseClass);
self::$_reflectionCache[$baseClass] = $baseMethods;
}
$return = [
'finders' => [],
'methods' => []
];
$reflection = new \ReflectionClass($class);
foreach ($reflection->getMethods(\ReflectionMethod::IS_PUBLIC) as $method) {
$methodName = $method->getName();
if (in_array($methodName, $baseMethods)) {
continue;
}
$methodName = $method->getName();
if (strpos($methodName, '_') === 0 || isset($eventMethods[$methodName])) {
continue;
}
if (substr($methodName, 0, 4) === 'find') {
$return['finders'][lcfirst(substr($methodName, 4))] = $methodName;
} else {
$return['methods'][$methodName] = $methodName;
}
}
return self::$_reflectionCache[$class] = $return;
}
}