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414 lines
12 KiB
414 lines
12 KiB
<?php |
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/** |
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* Module class file. |
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* |
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* @link http://www.yiiframework.com/ |
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* @copyright Copyright © 2008-2012 Yii Software LLC |
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* @license http://www.yiiframework.com/license/ |
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*/ |
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namespace yii\base; |
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/** |
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* Module is the base class for module and application classes. |
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* |
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* Module mainly manages application components and sub-modules that belongs to a module. |
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* |
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* @property string $id The module ID. |
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* @property string $basePath The root directory of the module. Defaults to the directory containing the module class. |
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* @property Module|null $parentModule The parent module. Null if this module does not have a parent. |
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* @property array $modules The configuration of the currently installed modules (module ID => configuration). |
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* @property array $components The application components (indexed by their IDs). |
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* @property array $import List of aliases to be imported. This property is write-only. |
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* @property array $aliases List of aliases to be defined. This property is write-only. |
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* |
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* @author Qiang Xue <qiang.xue@gmail.com> |
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* @since 2.0 |
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*/ |
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abstract class Module extends Component implements Initable |
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{ |
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/** |
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* @var array custom module parameters (name => value). |
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*/ |
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public $params = array(); |
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/** |
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* @var array the IDs of the application components that should be preloaded when this module is created. |
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*/ |
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public $preload = array(); |
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private $_id; |
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private $_basePath; |
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private $_parentModule; |
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private $_modules = array(); |
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private $_components = array(); |
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/** |
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* Constructor. |
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* @param string $id the ID of this module |
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* @param Module $parent the parent module (if any) |
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*/ |
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public function __construct($id, $parent = null) |
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{ |
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$this->_id = $id; |
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$this->_parentModule = $parent; |
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} |
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/** |
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* Getter magic method. |
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* This method is overridden to support accessing application components |
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* like reading module properties. |
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* @param string $name application component or property name |
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* @return mixed the named property value |
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*/ |
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public function __get($name) |
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{ |
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if ($this->hasComponent($name)) { |
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return $this->getComponent($name); |
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} else { |
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return parent::__get($name); |
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} |
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} |
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/** |
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* Checks if a property value is null. |
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* This method overrides the parent implementation by checking |
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* if the named application component is loaded. |
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* @param string $name the property name or the event name |
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* @return boolean whether the property value is null |
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*/ |
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public function __isset($name) |
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{ |
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if ($this->hasComponent($name)) { |
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return $this->getComponent($name) !== null; |
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} else { |
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return parent::__isset($name); |
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} |
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} |
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/** |
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* Initializes the module. |
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* This method is called after the module is created and initialized with property values |
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* given in configuration. The default implement will create a path alias using the module [[id]] |
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* and then call [[preloadComponents()]] to load components that are declared in [[preload]]. |
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*/ |
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public function init() |
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{ |
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\Yii::setAlias('@' . $this->getId(), $this->getBasePath()); |
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$this->preloadComponents(); |
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} |
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/** |
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* Returns the module ID. |
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* @return string the module ID. |
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*/ |
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public function getId() |
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{ |
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return $this->_id; |
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} |
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/** |
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* Sets the module ID. |
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* @param string $id the module ID |
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*/ |
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public function setId($id) |
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{ |
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$this->_id = $id; |
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} |
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/** |
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* Returns the root directory of the module. |
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* @return string the root directory of the module. Defaults to the directory containing the module class file. |
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*/ |
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public function getBasePath() |
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{ |
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if ($this->_basePath === null) { |
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$class = new \ReflectionClass($this); |
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$this->_basePath = dirname($class->getFileName()); |
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} |
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return $this->_basePath; |
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} |
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/** |
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* Sets the root directory of the module. |
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* This method can only be invoked at the beginning of the constructor. |
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* @param string $path the root directory of the module. |
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* @throws Exception if the directory does not exist. |
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*/ |
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public function setBasePath($path) |
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{ |
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if (($p = realpath($path)) === false || !is_dir($p)) { |
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throw new Exception('Invalid base path: ' . $path); |
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} else { |
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$this->_basePath = $p; |
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} |
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} |
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/** |
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* Imports the specified path aliases. |
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* This method is provided so that you can import a set of path aliases when configuring a module. |
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* The path aliases will be imported by calling [[\Yii::import()]]. |
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* @param array $aliases list of path aliases to be imported |
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*/ |
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public function setImport($aliases) |
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{ |
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foreach ($aliases as $alias) { |
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\Yii::import($alias); |
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} |
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} |
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/** |
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* Defines path aliases. |
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* This method calls [[\Yii::setAlias()]] to register the path aliases. |
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* This method is provided so that you can define path aliases when configuring a module. |
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* @param array $aliases list of path aliases to be defined. The array keys are alias names |
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* (must start with '@') and the array values are the corresponding paths or aliases. |
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* For example, |
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* |
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* ~~~ |
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* array( |
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* '@models' => '@app/models', // an existing alias |
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* '@backend' => __DIR__ . '/../backend', // a directory |
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* ) |
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* ~~~ |
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*/ |
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public function setAliases($aliases) |
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{ |
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foreach ($aliases as $name => $alias) { |
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\Yii::setAlias($name, $alias); |
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} |
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} |
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/** |
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* Returns the parent module. |
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* @return Module|null the parent module. Null is returned if this module does not have a parent. |
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*/ |
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public function getParentModule() |
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{ |
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return $this->_parentModule; |
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} |
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/** |
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* Checks whether the named module exists. |
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* @param string $id module ID |
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* @return boolean whether the named module exists. Both loaded and unloaded modules |
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* are considered. |
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*/ |
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public function hasModule($id) |
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{ |
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return isset($this->_modules[$id]); |
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} |
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/** |
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* Retrieves the named module. |
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* @param string $id module ID (case-sensitive) |
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* @param boolean $load whether to load the module if it is not yet loaded. |
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* @return Module|null the module instance, null if the module |
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* does not exist. |
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* @see hasModule() |
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*/ |
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public function getModule($id, $load = true) |
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{ |
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if (isset($this->_modules[$id])) { |
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if ($this->_modules[$id] instanceof Module) { |
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return $this->_modules[$id]; |
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} elseif ($load) { |
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\Yii::trace("Loading \"$id\" module", __CLASS__); |
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return $this->_modules[$id] = \Yii::createObject($this->_modules[$id], $id, $this); |
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} |
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} |
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return null; |
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} |
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/** |
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* Adds a sub-module to this module. |
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* @param string $id module ID |
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* @param Module|array|null $module the sub-module to be added to this module. This can |
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* be one of the followings: |
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* |
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* - a [[Module]] object |
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* - a configuration array: when [[getModule()]] is called initially, the array |
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* will be used to instantiate the sub-module |
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* - null: the named sub-module will be removed from this module |
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*/ |
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public function setModule($id, $module) |
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{ |
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if ($module === null) { |
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unset($this->_modules[$id]); |
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} else { |
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$this->_modules[$id] = $module; |
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} |
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} |
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/** |
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* Returns the sub-modules in this module. |
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* @param boolean $loadedOnly whether to return the loaded sub-modules only. If this is set false, |
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* then all sub-modules registered in this module will be returned, whether they are loaded or not. |
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* Loaded modules will be returned as objects, while unloaded modules as configuration arrays. |
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* @return array the modules (indexed by their IDs) |
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*/ |
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public function getModules($loadedOnly = false) |
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{ |
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if ($loadedOnly) { |
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$modules = array(); |
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foreach ($this->_modules as $module) { |
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if ($module instanceof Module) { |
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$modules[] = $module; |
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} |
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} |
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return $modules; |
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} else { |
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return $this->_modules; |
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} |
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} |
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/** |
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* Registers sub-modules in the current module. |
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* |
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* Each sub-module should be specified as a name-value pair, where |
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* name refers to the ID of the module and value the module or a configuration |
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* array that can be used to create the module. In the latter case, [[\Yii::createObject()]] |
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* will be used to create the module. |
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* |
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* If a new sub-module has the same ID as an existing one, the existing one will be overwritten silently. |
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* |
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* The following is an example for registering two sub-modules: |
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* |
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* ~~~ |
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* array( |
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* 'comment' => array( |
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* 'class' => 'app\modules\CommentModule', |
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* 'connectionID' => 'db', |
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* ), |
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* 'booking' => array( |
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* 'class' => 'app\modules\BookingModule', |
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* ), |
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* ) |
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* ~~~ |
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* |
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* @param array $modules modules (id => module configuration or instances) |
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*/ |
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public function setModules($modules) |
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{ |
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foreach ($modules as $id => $module) { |
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$this->_modules[$id] = $module; |
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} |
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} |
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/** |
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* Checks whether the named component exists. |
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* @param string $id application component ID |
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* @return boolean whether the named application component exists. Both loaded and unloaded components |
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* are considered. |
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*/ |
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public function hasComponent($id) |
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{ |
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return isset($this->_components[$id]); |
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} |
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/** |
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* Retrieves the named application component. |
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* @param string $id application component ID (case-sensitive) |
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* @param boolean $load whether to load the component if it is not yet loaded. |
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* @return ApplicationComponent|null the application component instance, null if the application component |
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* does not exist. |
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* @see hasComponent() |
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*/ |
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public function getComponent($id, $load = true) |
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{ |
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if (isset($this->_components[$id])) { |
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if ($this->_components[$id] instanceof ApplicationComponent) { |
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return $this->_components[$id]; |
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} elseif ($load) { |
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\Yii::trace("Loading \"$id\" application component", __CLASS__); |
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return $this->_components[$id] = \Yii::createObject($this->_components[$id]); |
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} |
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} |
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return null; |
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} |
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/** |
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* Registers an application component in this module. |
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* @param string $id component ID |
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* @param ApplicationComponent|array|null $component the component to be added to the module. This can |
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* be one of the followings: |
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* |
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* - an [[ApplicationComponent]] object |
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* - a configuration array: when [[getComponent()]] is called initially for this component, the array |
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* will be used to instantiate the component |
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* - null: the named component will be removed from the module |
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*/ |
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public function setComponent($id, $component) |
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{ |
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if ($component === null) { |
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unset($this->_components[$id]); |
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} else { |
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$this->_components[$id] = $component; |
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} |
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} |
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/** |
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* Returns the application components. |
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* @param boolean $loadedOnly whether to return the loaded components only. If this is set false, |
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* then all components specified in the configuration will be returned, whether they are loaded or not. |
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* Loaded components will be returned as objects, while unloaded components as configuration arrays. |
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* @return array the application components (indexed by their IDs) |
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*/ |
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public function getComponents($loadedOnly = false) |
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{ |
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if ($loadedOnly) { |
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$components = array(); |
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foreach ($this->_components as $component) { |
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if ($component instanceof ApplicationComponent) { |
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$components[] = $component; |
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} |
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} |
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return $components; |
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} else { |
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return $this->_components; |
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} |
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} |
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/** |
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* Registers a set of application components in this module. |
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* |
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* Each application component should be specified as a name-value pair, where |
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* name refers to the ID of the component and value the component or a configuration |
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* array that can be used to create the component. In the latter case, [[\Yii::createObject()]] |
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* will be used to create the component. |
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* |
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* If a new component has the same ID as an existing one, the existing one will be overwritten silently. |
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* |
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* The following is an example for setting two components: |
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* |
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* ~~~ |
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* array( |
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* 'db' => array( |
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* 'class' => 'yii\db\dao\Connection', |
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* 'dsn' => 'sqlite:path/to/file.db', |
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* ), |
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* 'cache' => array( |
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* 'class' => 'yii\caching\DbCache', |
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* 'connectionID' => 'db', |
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* ), |
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* ) |
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* ~~~ |
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* |
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* @param array $components application components (id => component configuration or instance) |
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*/ |
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public function setComponents($components) |
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{ |
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foreach ($components as $id => $component) { |
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$this->_components[$id] = $component; |
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} |
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} |
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/** |
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* Loads application components that are declared in [[preload]]. |
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*/ |
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public function preloadComponents() |
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{ |
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foreach ($this->preload as $id) { |
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$this->getComponent($id); |
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} |
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} |
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}
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