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496 lines
15 KiB
PHP
496 lines
15 KiB
PHP
<?php
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/**
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* Module class file.
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*
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* @author Qiang Xue <qiang.xue@gmail.com>
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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.
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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
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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.
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*/
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public $preload = array();
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/**
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* @var array the behaviors that should be attached to the module.
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* The behaviors will be attached to the module when [[init]] is called.
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* Please refer to [[Model::behaviors]] on how to specify the value of this property.
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*/
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public $behaviors = array();
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private $_id;
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private $_parentModule;
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private $_basePath;
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private $_modulePath;
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private $_params;
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private $_modules = array();
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private $_moduleConfig = array();
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private $_components = array();
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private $_componentConfig = 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 CModule $parent the parent module (if any)
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* @param mixed $config the module configuration. It can be either an array or
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* the path of a PHP file returning the configuration array.
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*/
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public function __construct($id, $parent, $config = null)
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{
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$this->_id = $id;
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$this->_parentModule = $parent;
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// set basePath at early as possible to avoid trouble
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if (is_string($config))
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$config = require($config);
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if (isset($config['basePath']))
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{
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$this->setBasePath($config['basePath']);
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unset($config['basePath']);
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}
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Yii::setPathOfAlias($id, $this->getBasePath());
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$this->preinit();
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$this->configure($config);
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$this->attachBehaviors($this->behaviors);
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$this->preloadComponents();
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$this->init();
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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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}
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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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}
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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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* Returns a list of behaviors that this model should behave as.
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* The return value of this method should be an array of behavior configurations
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* indexed by behavior names. For more details, please refer to [[Model::behaviors]].
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*
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* The declared behaviors will be attached to the module when [[init]] is called.
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* @return array the behavior configurations.
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*/
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public function behaviors()
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{
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return array();
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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.
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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 (($this->_basePath = realpath($path)) === false || !is_dir($this->_basePath)) {
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throw new Exception('Invalid base path: ' . $path);
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}
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}
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/**
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* Returns the directory that contains child modules.
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* @return string the directory that contains child modules. Defaults to the `modules` subdirectory under [[basePath]].
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*/
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public function getModulePath()
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{
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if ($this->_modulePath !== null) {
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return $this->_modulePath;
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}
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else {
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return $this->_modulePath = $this->getBasePath() . DIRECTORY_SEPARATOR . 'modules';
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}
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}
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/**
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* Sets the directory that contains child modules.
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* @param string $value the directory that contains child modules.
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* @throws Exception if the directory is invalid
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*/
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public function setModulePath($value)
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{
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if (($this->_modulePath = realpath($value)) === false || !is_dir($this->_modulePath)) {
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throw new Exception('Invalid module path: ' . $value);
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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 by module configuration.
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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::setPathOfAlias]] to register the path aliases.
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* This method is provided so that you can define path aliases by module configuration.
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* @param array $aliases list of path aliases to be defined. The array keys are alias names
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* (must start with '@') while the array values are the corresponding paths or aliases.
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* For example,
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*
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* ~~~
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* array(
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* '@models' => '@app/models', // an existing alias
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* '@backend' => __DIR__ . '/../backend', // a directory
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* )
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* ~~~
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*/
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public function setAliases($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 CModule the parent module. Null 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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* Retrieves the named application module.
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* The module has to be declared in {@link modules}. A new instance will be created
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* when calling this method with the given ID for the first time.
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* @param string $id application module ID (case-sensitive)
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* @return CModule the module instance, null if the module is disabled or does not exist.
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*/
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public function getModule($id)
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{
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if (isset($this->_modules[$id]) || array_key_exists($id, $this->_modules))
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return $this->_modules[$id];
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elseif (isset($this->_moduleConfig[$id]))
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{
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$config = $this->_moduleConfig[$id];
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if (!isset($config['enabled']) || $config['enabled'])
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{
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Yii::trace("Loading \"$id\" module", 'system.base.CModule');
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$class = $config['class'];
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unset($config['class'], $config['enabled']);
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if ($this === Yii::app())
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$module = Yii::createComponent($class, $id, null, $config);
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else
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$module = Yii::createComponent($class, $this->getId() . '/' . $id, $this, $config);
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return $this->_modules[$id] = $module;
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}
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}
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}
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/**
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* Returns a value indicating whether the specified module is installed.
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* @param string $id the module ID
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* @return boolean whether the specified module is installed.
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* @since 1.1.2
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*/
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public function hasModule($id)
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{
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return isset($this->_moduleConfig[$id]) || isset($this->_modules[$id]);
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}
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/**
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* Returns the configuration of the currently installed modules.
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* @return array the configuration of the currently installed modules (module ID => configuration)
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*/
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public function getModules()
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{
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return $this->_moduleConfig;
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}
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/**
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* Configures the sub-modules of this module.
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*
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* Call this method to declare sub-modules and configure them with their initial property values.
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* The parameter should be an array of module configurations. Each array element represents a single module,
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* which can be either a string representing the module ID or an ID-configuration pair representing
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* a module with the specified ID and the initial property values.
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*
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* For example, the following array declares two modules:
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* <pre>
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* array(
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* 'admin', // a single module ID
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* 'payment'=>array( // ID-configuration pair
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* 'server'=>'paymentserver.com',
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* ),
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* )
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* </pre>
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*
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* By default, the module class is determined using the expression <code>ucfirst($moduleID).'Module'</code>.
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* And the class file is located under <code>modules/$moduleID</code>.
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* You may override this default by explicitly specifying the 'class' option in the configuration.
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*
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* You may also enable or disable a module by specifying the 'enabled' option in the configuration.
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*
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* @param array $modules module configurations.
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*/
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public function setModules($modules)
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{
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foreach ($modules as $id => $module)
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{
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if (is_int($id))
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{
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$id = $module;
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$module = array();
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}
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if (!isset($module['class']))
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{
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Yii::setPathOfAlias($id, $this->getModulePath() . DIRECTORY_SEPARATOR . $id);
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$module['class'] = $id . '.' . ucfirst($id) . 'Module';
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}
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if (isset($this->_moduleConfig[$id]))
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$this->_moduleConfig[$id] = CMap::mergeArray($this->_moduleConfig[$id], $module);
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else
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$this->_moduleConfig[$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 $id application component ID
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* @return boolean whether the named application component exists (including both loaded and disabled.)
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*/
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public function hasComponent($id)
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{
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return isset($this->_components[$id]) || isset($this->_componentConfig[$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 $createIfNull whether to create the component if it doesn't exist yet. This parameter
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* has been available since version 1.0.6.
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* @return IApplicationComponent the application component instance, null if the application component is disabled or does not exist.
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* @see hasComponent
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*/
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public function getComponent($id, $createIfNull = true)
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{
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if (isset($this->_components[$id]))
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return $this->_components[$id];
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elseif (isset($this->_componentConfig[$id]) && $createIfNull)
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{
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$config = $this->_componentConfig[$id];
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if (!isset($config['enabled']) || $config['enabled'])
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{
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Yii::trace("Loading \"$id\" application component", 'system.CModule');
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unset($config['enabled']);
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$component = Yii::createComponent($config);
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$component->init();
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return $this->_components[$id] = $component;
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}
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}
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}
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/**
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* Puts a component under the management of the module.
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* The component will be initialized by calling its {@link CApplicationComponent::init() init()}
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* method if it has not done so.
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* @param string $id component ID
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* @param IApplicationComponent $component the component to be added to the module.
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* If this parameter is null, it will unload the component from the module.
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*/
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public function setComponent($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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{
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$this->_components[$id] = $component;
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if (!$component->getIsInitialized())
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$component->init();
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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 $loadedOnly whether to return the loaded components only. If this is set false,
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* then all components specified in the configuration will be returned, whether they are loaded or not.
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* Loaded components will be returned as objects, while unloaded components as configuration arrays.
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* This parameter has been available since version 1.1.3.
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* @return array the application components (indexed by their IDs)
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*/
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public function getComponents($loadedOnly = true)
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{
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if ($loadedOnly)
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return $this->_components;
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else
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return array_merge($this->_componentConfig, $this->_components);
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}
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/**
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* Sets the application components.
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*
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* When a configuration is used to specify a component, it should consist of
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* the component's initial property values (name-value pairs). Additionally,
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* a component can be enabled (default) or disabled by specifying the 'enabled' value
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* in the configuration.
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*
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* If a configuration is specified with an ID that is the same as an existing
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* component or configuration, the existing one will be replaced silently.
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*
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* The following is the configuration for two components:
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* <pre>
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* array(
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* 'db'=>array(
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* 'class'=>'CDbConnection',
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* 'connectionString'=>'sqlite:path/to/file.db',
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* ),
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* 'cache'=>array(
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* 'class'=>'CDbCache',
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* 'connectionID'=>'db',
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* 'enabled'=>!YII_DEBUG, // enable caching in non-debug mode
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* ),
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* )
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* </pre>
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*
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* @param array $components application components(id=>component configuration or instances)
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* @param boolean $merge whether to merge the new component configuration with the existing one.
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* Defaults to true, meaning the previously registered component configuration of the same ID
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* will be merged with the new configuration. If false, the existing configuration will be replaced completely.
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*/
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public function setComponents($components, $merge = true)
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{
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foreach ($components as $id => $component)
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{
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if ($component instanceof IApplicationComponent)
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$this->setComponent($id, $component);
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elseif (isset($this->_componentConfig[$id]) && $merge)
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$this->_componentConfig[$id] = CMap::mergeArray($this->_componentConfig[$id], $component);
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else
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$this->_componentConfig[$id] = $component;
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}
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}
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/**
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* Configures the module with the specified configuration.
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* @param array $config the configuration array
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*/
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public function configure($config)
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{
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if (is_array($config))
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{
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foreach ($config as $key => $value)
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$this->$key = $value;
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}
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}
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/**
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* Loads static application components.
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*/
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public function preloadComponents()
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{
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foreach ($this->preload as $id)
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$this->getComponent($id);
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}
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/**
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* Preinitializes the module.
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* This method is called at the beginning of the module constructor.
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* You may override this method to do some customized preinitialization work.
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* Note that at this moment, the module is not configured yet.
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* @see init
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*/
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public function preinit()
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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 at the end of the module constructor.
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* Note that at this moment, the module has been configured, the behaviors
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* have been attached and the application components have been registered.
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* @see preinit
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*/
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public function init()
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{
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}
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}
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