* {@link CClipWidget Clips} : a clip is a piece of captured output that can be inserted elsewhere.
* {@link CWidget Widgets} : a widget is a self-contained sub-controller with its own view and model.
* {@link COutputCache Fragment cache} : fragment cache selectively caches a portion of the output.
*
*
* To use a widget in a view, use the following in the view:
*
* $this->widget('path.to.widgetClass',array('property1'=>'value1',...));
*
* or
*
* $this->beginWidget('path.to.widgetClass',array('property1'=>'value1',...));
* // ... display other contents here
* $this->endWidget();
*
*
* To create a clip, use the following:
*
* $this->beginClip('clipID');
* // ... display the clip contents
* $this->endClip();
*
* Then, in a different view or place, the captured clip can be inserted as:
*
* echo $this->clips['clipID'];
*
*
* Note that $this in the code above refers to current controller so, for example,
* if you need to access clip from a widget where $this refers to widget itself
* you need to do it the following way:
*
*
* echo $this->getController()->clips['clipID'];
*
*
* To use fragment cache, do as follows,
*
* if($this->beginCache('cacheID',array('property1'=>'value1',...))
* {
* // ... display the content to be cached here
* $this->endCache();
* }
*
*
* @author Qiang Xue
* @since 2.0
*/
abstract class Controller extends Component implements Initable
{
/**
* @var string the name of the default action. Defaults to 'index'.
*/
public $defaultAction = 'index';
private $_id;
private $_action;
private $_module;
/**
* @param string $id id of this controller
* @param CWebModule $module the module that this controller belongs to.
*/
public function __construct($id, $module = null)
{
$this->_id = $id;
$this->_module = $module;
}
/**
* Initializes the controller.
* This method is called by the application before the controller starts to execute.
* You may override this method to perform the needed initialization for the controller.
*/
public function init()
{
}
/**
* Returns the filter configurations.
*
* By overriding this method, child classes can specify filters to be applied to actions.
*
* This method returns an array of filter specifications. Each array element specify a single filter.
*
* For a method-based filter (called inline filter), it is specified as 'FilterName[ +|- Action1, Action2, ...]',
* where the '+' ('-') operators describe which actions should be (should not be) applied with the filter.
*
* For a class-based filter, it is specified as an array like the following:
*
* array(
* 'FilterClass[ +|- Action1, Action2, ...]',
* 'name1'=>'value1',
* 'name2'=>'value2',
* ...
* )
*
* where the name-value pairs will be used to initialize the properties of the filter.
*
* Note, in order to inherit filters defined in the parent class, a child class needs to
* merge the parent filters with child filters using functions like array_merge().
*
* @return array a list of filter configurations.
* @see CFilter
*/
public function filters()
{
return array();
}
/**
* Returns a list of external action classes.
* Array keys are action IDs, and array values are the corresponding
* action class in dot syntax (e.g. 'edit'=>'application.controllers.article.EditArticle')
* or arrays representing the configuration of the actions, such as the following,
*
* return array(
* 'action1'=>'path.to.Action1Class',
* 'action2'=>array(
* 'class'=>'path.to.Action2Class',
* 'property1'=>'value1',
* 'property2'=>'value2',
* ),
* );
*
* Derived classes may override this method to declare external actions.
*
* Note, in order to inherit actions defined in the parent class, a child class needs to
* merge the parent actions with child actions using functions like array_merge().
*
* You may import actions from an action provider
* (such as a widget, see {@link CWidget::actions}), like the following:
*
* return array(
* ...other actions...
* // import actions declared in ProviderClass::actions()
* // the action IDs will be prefixed with 'pro.'
* 'pro.'=>'path.to.ProviderClass',
* // similar as above except that the imported actions are
* // configured with the specified initial property values
* 'pro2.'=>array(
* 'class'=>'path.to.ProviderClass',
* 'action1'=>array(
* 'property1'=>'value1',
* ),
* 'action2'=>array(
* 'property2'=>'value2',
* ),
* ),
* )
*
*
* In the above, we differentiate action providers from other action
* declarations by the array keys. For action providers, the array keys
* must contain a dot. As a result, an action ID 'pro2.action1' will
* be resolved as the 'action1' action declared in the 'ProviderClass'.
*
* @return array list of external action classes
* @see createAction
*/
public function actions()
{
return array();
}
/**
* Returns the access rules for this controller.
* Override this method if you use the {@link filterAccessControl accessControl} filter.
* @return array list of access rules. See {@link CAccessControlFilter} for details about rule specification.
*/
public function accessRules()
{
return array();
}
/**
* Runs the named action.
* Filters specified via {@link filters()} will be applied.
* @param string $actionID action ID
* @throws CHttpException if the action does not exist or the action name is not proper.
* @see filters
* @see createAction
* @see runAction
*/
public function run($actionID)
{
if (($action = $this->createAction($actionID)) !== null) {
if (($parent = $this->getModule()) === null) {
$parent = Yii::app();
}
if ($parent->beforeControllerAction($this, $action)) {
$this->runActionWithFilters($action, $this->filters());
$parent->afterControllerAction($this, $action);
}
}
else
{
$this->missingAction($actionID);
}
}
/**
* Runs an action with the specified filters.
* A filter chain will be created based on the specified filters
* and the action will be executed then.
* @param Action $action the action to be executed.
* @param array $filters list of filters to be applied to the action.
* @see filters
* @see createAction
* @see runAction
*/
public function runActionWithFilters($action, $filters)
{
if (empty($filters)) {
$this->runAction($action);
}
else
{
$priorAction = $this->_action;
$this->_action = $action;
CFilterChain::create($this, $action, $filters)->run();
$this->_action = $priorAction;
}
}
/**
* Runs the action after passing through all filters.
* This method is invoked by {@link runActionWithFilters} after all possible filters have been executed
* and the action starts to run.
* @param Action $action action to run
*/
public function runAction($action)
{
$priorAction = $this->_action;
$this->_action = $action;
if ($this->beforeAction($action)) {
$params = $action->normalizeParams($this->getActionParams());
if ($params === false) {
$this->invalidActionParams($action);
} else {
call_user_func_array(array($action, 'run'), $params);
$this->afterAction($action);
}
}
$this->_action = $priorAction;
}
/**
* Returns the request parameters that will be used for action parameter binding.
* Default implementation simply returns an empty array.
* Child classes may override this method to customize the parameters to be provided
* for action parameter binding (e.g. `$_GET`).
* @return array the request parameters (name-value pairs) to be used for action parameter binding
*/
public function getActionParams()
{
return array();
}
/**
* This method is invoked when the request parameters do not satisfy the requirement of the specified action.
* The default implementation will throw a 400 HTTP exception.
* @param Action $action the action being executed
* @throws HttpException a 400 HTTP exception
*/
public function invalidActionParams($action)
{
throw new HttpException(400, \Yii::t('yii', 'Your request is invalid.'));
}
/**
* Creates the action instance based on the action name.
* The action can be either an inline action or an object.
* The latter is created by looking up the action map specified in {@link actions}.
* @param string $actionID ID of the action. If empty, the {@link defaultAction default action} will be used.
* @return Action the action instance, null if the action does not exist.
* @see actions
*/
public function createAction($actionID)
{
if ($actionID === '') {
$actionID = $this->defaultAction;
}
if (method_exists($this, 'action' . $actionID) && strcasecmp($actionID, 's')) // we have actions method
{
return new CInlineAction($this, $actionID);
}
else
{
$action = $this->createActionFromMap($this->actions(), $actionID, $actionID);
if ($action !== null && !method_exists($action, 'run')) {
throw new CException(Yii::t('yii', 'Action class {class} must implement the "run" method.', array('{class}' => get_class($action))));
}
return $action;
}
}
/**
* Creates the action instance based on the action map.
* This method will check to see if the action ID appears in the given
* action map. If so, the corresponding configuration will be used to
* create the action instance.
* @param array $actionMap the action map
* @param string $actionID the action ID that has its prefix stripped off
* @param string $requestActionID the originally requested action ID
* @param array $config the action configuration that should be applied on top of the configuration specified in the map
* @return Action the action instance, null if the action does not exist.
*/
protected function createActionFromMap($actionMap, $actionID, $requestActionID, $config = array())
{
if (($pos = strpos($actionID, '.')) === false && isset($actionMap[$actionID])) {
$baseConfig = is_array($actionMap[$actionID]) ? $actionMap[$actionID] : array('class' => $actionMap[$actionID]);
return Yii::createComponent(empty($config) ? $baseConfig : array_merge($baseConfig, $config), $this, $requestActionID);
}
else {
if ($pos === false) {
return null;
}
}
// the action is defined in a provider
$prefix = substr($actionID, 0, $pos + 1);
if (!isset($actionMap[$prefix])) {
return null;
}
$actionID = (string)substr($actionID, $pos + 1);
$provider = $actionMap[$prefix];
if (is_string($provider)) {
$providerType = $provider;
}
else {
if (is_array($provider) && isset($provider['class'])) {
$providerType = $provider['class'];
if (isset($provider[$actionID])) {
if (is_string($provider[$actionID])) {
$config = array_merge(array('class' => $provider[$actionID]), $config);
}
else
{
$config = array_merge($provider[$actionID], $config);
}
}
}
else
{
throw new CException(Yii::t('yii', 'Object configuration must be an array containing a "class" element.'));
}
}
$class = Yii::import($providerType, true);
$map = call_user_func(array($class, 'actions'));
return $this->createActionFromMap($map, $actionID, $requestActionID, $config);
}
/**
* Handles the request whose action is not recognized.
* This method is invoked when the controller cannot find the requested action.
* The default implementation simply throws an exception.
* @param string $actionID the missing action name
* @throws CHttpException whenever this method is invoked
*/
public function missingAction($actionID)
{
throw new CHttpException(404, Yii::t('yii', 'The system is unable to find the requested action "{action}".',
array('{action}' => $actionID == '' ? $this->defaultAction : $actionID)));
}
/**
* @return Action the action currently being executed, null if no active action.
*/
public function getAction()
{
return $this->_action;
}
/**
* @param Action $value the action currently being executed.
*/
public function setAction($value)
{
$this->_action = $value;
}
/**
* @return string ID of the controller
*/
public function getId()
{
return $this->_id;
}
/**
* @return string the controller ID that is prefixed with the module ID (if any).
*/
public function getUniqueId()
{
return $this->_module ? $this->_module->getId() . '/' . $this->_id : $this->_id;
}
/**
* @return string the route (module ID, controller ID and action ID) of the current request.
* @since 1.1.0
*/
public function getRoute()
{
if (($action = $this->getAction()) !== null) {
return $this->getUniqueId() . '/' . $action->getId();
}
else
{
return $this->getUniqueId();
}
}
/**
* @return CWebModule the module that this controller belongs to. It returns null
* if the controller does not belong to any module
*/
public function getModule()
{
return $this->_module;
}
/**
* Processes the request using another controller action.
* This is like {@link redirect}, but the user browser's URL remains unchanged.
* In most cases, you should call {@link redirect} instead of this method.
* @param string $route the route of the new controller action. This can be an action ID, or a complete route
* with module ID (optional in the current module), controller ID and action ID. If the former, the action is assumed
* to be located within the current controller.
* @param boolean $exit whether to end the application after this call. Defaults to true.
* @since 1.1.0
*/
public function forward($route, $exit = true)
{
if (strpos($route, '/') === false) {
$this->run($route);
}
else
{
if ($route[0] !== '/' && ($module = $this->getModule()) !== null) {
$route = $module->getId() . '/' . $route;
}
Yii::app()->runController($route);
}
if ($exit) {
Yii::app()->end();
}
}
/**
* This method is invoked right before an action is to be executed (after all possible filters.)
* You may override this method to do last-minute preparation for the action.
* @param Action $action the action to be executed.
* @return boolean whether the action should be executed.
*/
protected function beforeAction($action)
{
return true;
}
/**
* This method is invoked right after an action is executed.
* You may override this method to do some postprocessing for the action.
* @param Action $action the action just executed.
*/
protected function afterAction($action)
{
}
}