Versions
Look up a class, method, property or event

CExpressionDependency

Package system.caching.dependencies
Inheritance class CExpressionDependency » CCacheDependency » CComponent
Implements ICacheDependency
Since 1.0
Version $Id: CExpressionDependency.php 1507 2009-11-02 13:49:59Z qiang.xue $
CExpressionDependency represents a dependency based on the result of a PHP expression.

CExpressionDependency performs dependency checking based on the result of a PHP expression. The dependency is reported as unchanged if and only if the result is the same as the one evaluated when storing the data to cache.

Public Properties

Hide inherited properties

PropertyTypeDescriptionDefined By
dependentData mixed the data used to determine if dependency has been changed. CCacheDependency
expression string the PHP expression whose result is used to determine the dependency. CExpressionDependency
hasChanged boolean whether the dependency has changed. CCacheDependency

Public Methods

Hide inherited methods

MethodDescriptionDefined By
__call() Calls the named method which is not a class method. CComponent
__construct() Constructor. CExpressionDependency
__get() Returns a property value, an event handler list or a behavior based on its name. CComponent
__isset() Checks if a property value is null. CComponent
__set() Sets value of a component property. CComponent
__unset() Sets a component property to be null. CComponent
asa() Returns the named behavior object. CComponent
attachBehavior() Attaches a behavior to this component. CComponent
attachBehaviors() Attaches a list of behaviors to the component. CComponent
attachEventHandler() Attaches an event handler to an event. CComponent
canGetProperty() Determines whether a property can be read. CComponent
canSetProperty() Determines whether a property can be set. CComponent
detachBehavior() Detaches a behavior from the component. CComponent
detachBehaviors() Detaches all behaviors from the component. CComponent
detachEventHandler() Detaches an existing event handler. CComponent
disableBehavior() Disables an attached behavior. CComponent
disableBehaviors() Disables all behaviors attached to this component. CComponent
enableBehavior() Enables an attached behavior. CComponent
enableBehaviors() Enables all behaviors attached to this component. CComponent
evaluateDependency() Evaluates the dependency by generating and saving the data related with dependency. CCacheDependency
getDependentData() CCacheDependency
getEventHandlers() Returns the list of attached event handlers for an event. CComponent
getHasChanged() CCacheDependency
hasEvent() Determines whether an event is defined. CComponent
hasEventHandler() Checks whether the named event has attached handlers. CComponent
hasProperty() Determines whether a property is defined. CComponent
raiseEvent() Raises an event. CComponent

Protected Methods

Hide inherited methods

MethodDescriptionDefined By
generateDependentData() Generates the data needed to determine if dependency has been changed. CExpressionDependency

Property Details

expression property
public string $expression;

the PHP expression whose result is used to determine the dependency. Starting from version 1.0.11, the expression can also be a valid PHP callback, including class method name (array(ClassName/Object, MethodName)), or anonymous function (PHP 5.3.0+). The function/method will be passed a single parameter which is the dependency object itself.

Method Details

__construct() method
public void __construct(string $expression='true')
$expression string the PHP expression whose result is used to determine the dependency.

Constructor.

generateDependentData() method
protected mixed generateDependentData()
{return} mixed the data needed to determine if dependency has been changed.

Generates the data needed to determine if dependency has been changed. This method returns the result of the PHP expression.

Be the first person to leave a comment

Please to leave your comment.