- Models, Behaviors ...

5 files changed, 810 insertions, 0 deletions

diff --git a/framework/Base/TBehavior.php b/framework/Base/TBehavior.php
new file mode 100644
index 00000000..b2833140
--- /dev/null
+++ b/framework/Base/TBehavior.php
@@ -0,0 +1,120 @@
+<?php
+/**
+ * CBehavior class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CBehavior is a convenient base class for behavior classes.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CBehavior.php 564 2009-01-21 22:07:10Z qiang.xue $
+ * @package system.base
+ * @since 1.0.2
+ */
+class TBehavior extends TComponent implements IBehavior
+{
+	private $_enabled;
+	private $_owner;
+
+	/**
+	 * Declares events and the corresponding event handler methods.
+	 * The events are defined by the {@link owner} component, while the handler
+	 * methods by the behavior class. The handlers will be attached to the corresponding
+	 * events when the behavior is attached to the {@link owner} component; and they
+	 * will be detached from the events when the behavior is detached from the component.
+	 * @return array events (array keys) and the corresponding event handler methods (array values).
+	 */
+	public function events()
+	{
+		return array();
+	}
+
+	/**
+	 * Attaches the behavior object to the component.
+	 * The default implementation will set the {@link owner} property
+	 * and attach event handlers as declared in {@link events}.
+	 * Make sure you call the parent implementation if you override this method.
+	 * @param CComponent the component that this behavior is to be attached to.
+	 */
+	public function attach($owner)
+	{
+		$this->_owner=$owner;
+		foreach($this->events() as $event=>$handler)
+			$owner->attachEventHandler($event,array($this,$handler));
+	}
+
+	/**
+	 * Detaches the behavior object from the component.
+	 * The default implementation will unset the {@link owner} property
+	 * and detach event handlers declared in {@link events}.
+	 * Make sure you call the parent implementation if you override this method.
+	 * @param CComponent the component that this behavior is to be detached from.
+	 */
+	public function detach($owner)
+	{
+		foreach($this->events() as $event=>$handler)
+			$owner->detachEventHandler($event,array($this,$handler));
+		$this->_owner=null;
+	}
+
+	/**
+	 * @return CComponent the owner component that this behavior is attached to.
+	 */
+	public function getOwner()
+	{
+		return $this->_owner;
+	}
+
+	/**
+	 * @return boolean whether this behavior is enabled
+	 */
+	public function getEnabled()
+	{
+		return $this->_enabled;
+	}
+
+	/**
+	 * @param boolean whether this behavior is enabled
+	 */
+	public function setEnabled($value)
+	{
+		$this->_enabled=$value;
+	}
+}
+
+/**
+ * IBehavior interfaces is implemented by all behavior classes.
+ *
+ * A behavior is a way to enhance a component with additional methods that
+ * are defined in the behavior class and not available in the component class.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: interfaces.php 956 2009-04-21 15:16:03Z qiang.xue@gmail.com $
+ * @package system.base
+ * @since 1.0.2
+ */
+interface IBehavior
+{
+	/**
+	 * Attaches the behavior object to the component.
+	 * @param CComponent the component that this behavior is to be attached to.
+	 */
+	public function attach($component);
+	/**
+	 * Detaches the behavior object from the component.
+	 * @param CComponent the component that this behavior is to be detached from.
+	 */
+	public function detach($component);
+	/**
+	 * @return boolean whether this behavior is enabled
+	 */
+	public function getEnabled();
+	/**
+	 * @param boolean whether this behavior is enabled
+	 */
+	public function setEnabled($value);
+}
\ No newline at end of file
diff --git a/framework/Base/TEvent.php b/framework/Base/TEvent.php
new file mode 100644
index 00000000..0f64e89d
--- /dev/null
+++ b/framework/Base/TEvent.php
@@ -0,0 +1,36 @@
+<?php
+/**
+ * CEvent is the base class for all event classes.
+ *
+ * It encapsulates the parameters associated with an event.
+ * The {@link sender} property describes who raises the event.
+ * And the {@link handled} property indicates if the event is handled.
+ * If an event handler sets {@link handled} to true, those handlers
+ * that are not invoked yet will not be invoked anymore.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CComponent.php 978 2009-05-06 03:36:09Z qiang.xue $
+ * @package system.base
+ * @since 1.0
+ */
+class TEvent extends TComponent
+{
+	/**
+	 * @var object the sender of this event
+	 */
+	public $sender;
+	/**
+	 * @var boolean whether the event is handled. Defaults to false.
+	 * When a handler sets this true, the rest uninvoked handlers will not be invoked anymore.
+	 */
+	public $handled=false;
+
+	/**
+	 * Constructor.
+	 * @param mixed sender of the event
+	 */
+	public function __construct($sender=null)
+	{
+		$this->sender=$sender;
+	}
+}
\ No newline at end of file
diff --git a/framework/Base/TModel.php b/framework/Base/TModel.php
new file mode 100644
index 00000000..492bcbd9
--- /dev/null
+++ b/framework/Base/TModel.php
@@ -0,0 +1,567 @@
+<?php
+/**
+ * CModel class file.
+ * 
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+Prado::using('System.Base.TModelEvent');
+
+/**
+ * CModel is the base class providing the common features needed by data model objects.
+ *
+ * CModel defines the basic framework for data models that need to be validated.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CModel.php 1093 2009-06-05 13:09:17Z qiang.xue $
+ * @package system.base
+ * @since 1.0
+ */
+abstract class TModel extends TComponent implements IteratorAggregate, ArrayAccess
+{
+	private $_errors=array();	// attribute name => array of errors
+	private $_validators;  		// validators
+	private $_scenario='';  	// scenario
+
+ 	/**
+ 	 * THE FOLLOWING METHOD IS NEEDED BECAUSE OF COMPATIBILITY REASONS WITH PRADO
+ 	 * raiseEvent adapter method for TComponent
+ 	 * Was necessary because CActiveRecord doesnt use the third parameter
+ 	 * @param string EventName
+ 	 * @param TEvent Event
+ 	 */
+ 	public function raiseEvent($name, $event)
+ 	{
+		parent::raiseEvent($name, $event, new TEventParameter());
+ 	}
+	
+	/**
+	 * Returns the list of attribute names of the model.
+	 * @return array list of attribute names.
+	 * @since 1.0.1
+	 */
+	abstract public function attributeNames();
+
+	/**
+	 * Returns the validation rules for attributes.
+	 *
+	 * This method should be overridden to declare validation rules.
+	 * Each rule is an array with the following structure:
+	 * <pre>
+	 * array('attribute list', 'validator name', 'on'=>'scenario name', ...validation parameters...)
+	 * </pre>
+	 * where
+	 * <ul>
+	 * <li>attribute list: specifies the attributes (separated by commas) to be validated;</li>
+	 * <li>validator name: specifies the validator to be used. It can be the name of a model class
+	 *   method, the name of a built-in validator, or a validator class (or its path alias).
+	 *   A validation method must have the following signature:
+	 * <pre>
+	 * // $params refers to validation parameters given in the rule
+	 * function validatorName($attribute,$params)
+	 * </pre>
+	 *   A built-in validator refers to one of the validators declared in {@link CValidator::builtInValidators}.
+	 *   And a validator class is a class extending {@link CValidator}.</li>
+	 * <li>on: this specifies the scenarios when the validation rule should be performed.
+	 *   Separate different scenarios with commas. If this option is not set, the rule
+	 *   will be applied in any scenario. Please see {@link scenario} for more details about this option.</li>
+	 * <li>additional parameters are used to initialize the corresponding validator properties.
+	 *   Please refer to individal validator class API for possible properties.</li>
+	 * </ul>
+	 *
+	 * The following are some examples:
+	 * <pre>
+	 * array(
+	 *     array('username', 'required'),
+	 *     array('username', 'length', 'min'=>3, 'max'=>12),
+	 *     array('password', 'compare', 'compareAttribute'=>'password2', 'on'=>'register'),
+	 *     array('password', 'authenticate', 'on'=>'login'),
+	 * );
+	 * </pre>
+	 *
+	 * Note, in order to inherit rules defined in the parent class, a child class needs to
+	 * merge the parent rules with child rules using functions like array_merge().
+	 *
+	 * @return array validation rules to be applied when {@link validate()} is called.
+	 * @see scenario
+	 */
+	public function rules()
+	{
+		return array();
+	}
+
+	/**
+	 * Returns a list of behaviors that this model should behave as.
+	 * The return value should be an array of behavior configurations indexed by
+	 * behavior names. Each behavior configuration can be either a string specifying
+	 * the behavior class or an array of the following structure:
+	 * <pre>
+	 * 'behaviorName'=>array(
+	 *     'class'=>'path.to.BehaviorClass',
+	 *     'property1'=>'value1',
+	 *     'property2'=>'value2',
+	 * )
+	 * </pre>
+	 *
+	 * Note, the behavior classes must implement {@link IBehavior} or extend from
+	 * {@link CBehavior}. Behaviors declared in this method will be attached
+	 * to the model when it is instantiated.
+	 *
+	 * For more details about behaviors, see {@link CComponent}.
+	 * @return array the behavior configurations (behavior name=>behavior configuration)
+	 * @since 1.0.2
+	 */
+	public function behaviors()
+	{
+		return array();
+	}
+
+	/**
+	 * Returns the attribute labels.
+	 * Attribute labels are mainly used in error messages of validation.
+	 * By default an attribute label is generated using {@link generateAttributeLabel}.
+	 * This method allows you to explicitly specify attribute labels.
+	 *
+	 * Note, in order to inherit labels defined in the parent class, a child class needs to
+	 * merge the parent labels with child labels using functions like array_merge().
+	 *
+	 * @return array attribute labels (name=>label)
+	 * @see generateAttributeLabel
+	 */
+	public function attributeLabels()
+	{
+		return array();
+	}
+
+	/**
+	 * Performs the validation.
+	 *
+	 * This method executes the validation rules as declared in {@link rules}.
+	 * Only the rules applicable to the current {@link scenario} will be executed.
+	 * A rule is considered applicable to a scenario if its 'on' option is not set
+	 * or contains the scenario.
+	 *
+	 * Errors found during the validation can be retrieved via {@link getErrors}.
+	 *
+	 * @param array list of attributes that should be validated. Defaults to null,
+	 * meaning any attribute listed in the applicable validation rules should be
+	 * validated. If this parameter is given as a list of attributes, only
+	 * the listed attributes will be validated.
+	 * @return boolean whether the validation is successful without any error.
+	 * @see beforeValidate
+	 * @see afterValidate
+	 */
+	public function validate($attributes=null)
+	{
+		$this->clearErrors();
+		if($this->beforeValidate())
+		{
+			foreach($this->getValidators() as $validator)
+				$validator->validate($this,$attributes);
+			$this->afterValidate();
+			return !$this->hasErrors();
+		}
+		else
+			return false;
+	}
+
+	/**
+	 * This method is invoked before validation starts.
+	 * The default implementation calls {@link onBeforeValidate} to raise an event.
+	 * You may override this method to do preliminary checks before validation.
+	 * Make sure the parent implementation is invoked so that the event can be raised.
+	 * @return boolean whether validation should be executed. Defaults to true.
+	 */
+	protected function beforeValidate()
+	{
+		$event=new TModelEvent($this);
+		$this->onBeforeValidate($event);
+		return $event->isValid;
+	}
+
+	/**
+	 * This method is invoked after validation ends.
+	 * The default implementation calls {@link onAfterValidate} to raise an event.
+	 * You may override this method to do postprocessing after validation.
+	 * Make sure the parent implementation is invoked so that the event can be raised.
+	 */
+	protected function afterValidate()
+	{
+		$this->onAfterValidate(new TEvent($this));
+	}
+
+	/**
+	 * This event is raised before the validation is performed.
+	 * @param CModelEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onBeforeValidate($event)
+	{
+		$this->raiseEvent('onBeforeValidate',$event);
+	}
+
+	/**
+	 * This event is raised after the validation is performed.
+	 * @param CEvent the event parameter
+	 * @since 1.0.2
+	 */
+	public function onAfterValidate($event)
+	{
+		$this->raiseEvent('onAfterValidate',$event);
+	}
+
+	/**
+	 * Returns the validators applicable to the current {@link scenario}.
+	 * @param string the name of the attribute whose validators should be returned.
+	 * If this is null, the validators for ALL attributes in the model will be returned.
+	 * @return array the validators applicable to the current {@link scenario}.
+	 * @since 1.0.1
+	 * 
+	 * @TODO Port validators from Yii to Prado? Not used in ActiveRecords -> ignoring this for now...
+	 * 
+	 */
+	public function getValidators($attribute=null)
+	{
+		/*if($this->_validators===null)
+			$this->_validators=$this->createValidators();
+
+		$validators=array();
+		$scenario=$this->getScenario();
+		foreach($this->_validators as $validator)
+		{
+			if($validator->applyTo($scenario))
+			{
+				if($attribute===null || in_array($attribute,$validator->attributes,true))
+					$validators[]=$validator;
+			}
+		}
+		return $validators;*/
+		return array();
+	}
+
+	/**
+	 * Creates validator objects based on the specification in {@link rules}.
+	 * This method is mainly used internally.
+	 * @return array validators built based on {@link rules()}.
+	 *
+	 * @TODO Port validators from Yii to Prado? Not used in ActiveRecords -> ignoring this for now...
+	 * 
+	 */
+	public function createValidators()
+	{
+		/*$validators=array();
+		foreach($this->rules() as $rule)
+		{
+			if(isset($rule[0],$rule[1]))  // attributes, validator name
+				$validators[]=CValidator::createValidator($rule[1],$this,$rule[0],array_slice($rule,2));
+			else
+				throw new CException(Yii::t('yii','{class} has an invalid validation rule. The rule must specify attributes to be validated and the validator name.',
+					array('{class}'=>get_class($this))));
+		}
+		return $validators;*/
+		return array();
+	}
+
+	/**
+	 * Returns a value indicating whether the attribute is required.
+	 * This is determined by checking if the attribute is associated with a
+	 * {@link CRequiredValidator} validation rule in the current {@link scenario}.
+	 * @param string attribute name
+	 * @return boolean whether the attribute is required
+	 * @since 1.0.2
+	 *
+	 * @TODO Port validators from Yii to Prado? Not used in ActiveRecords -> ignoring this for now...
+	 * 
+	 */
+	public function isAttributeRequired($attribute)
+	{
+		/*
+		foreach($this->getValidators($attribute) as $validator)
+		{
+			if($validator instanceof CRequiredValidator)
+				return true;
+		}
+		return false;
+		*/
+		return true;
+	}
+
+	/**
+	 * Returns the text label for the specified attribute.
+	 * @param string the attribute name
+	 * @return string the attribute label
+	 * @see generateAttributeLabel
+	 * @see attributeLabels
+	 */
+	public function getAttributeLabel($attribute)
+	{
+		$labels=$this->attributeLabels();
+		if(isset($labels[$attribute]))
+			return $labels[$attribute];
+		else
+			return $this->generateAttributeLabel($attribute);
+	}
+
+	/**
+	 * Returns a value indicating whether there is any validation error.
+	 * @param string attribute name. Use null to check all attributes.
+	 * @return boolean whether there is any error.
+	 */
+	public function hasErrors($attribute=null)
+	{
+		if($attribute===null)
+			return $this->_errors!==array();
+		else
+			return isset($this->_errors[$attribute]);
+	}
+
+	/**
+	 * Returns the errors for all attribute or a single attribute.
+	 * @param string attribute name. Use null to retrieve errors for all attributes.
+	 * @return array errors for all attributes or the specified attribute. Empty array is returned if no error.
+	 */
+	public function getErrors($attribute=null)
+	{
+		if($attribute===null)
+			return $this->_errors;
+		else
+			return isset($this->_errors[$attribute]) ? $this->_errors[$attribute] : array();
+	}
+
+	/**
+	 * Returns the first error of the specified attribute.
+	 * @param string attribute name.
+	 * @return string the error message. Null is returned if no error.
+	 * @since 1.0.2
+	 */
+	public function getError($attribute)
+	{
+		return isset($this->_errors[$attribute]) ? reset($this->_errors[$attribute]) : null;
+	}
+
+	/**
+	 * Adds a new error to the specified attribute.
+	 * @param string attribute name
+	 * @param string new error message
+	 */
+	public function addError($attribute,$error)
+	{
+		$this->_errors[$attribute][]=$error;
+	}
+
+	/**
+	 * Adds a list of errors.
+	 * @param array a list of errors. The array keys must be attribute names.
+	 * The array values should be error messages. If an attribute has multiple errors,
+	 * these errors must be given in terms of an array.
+	 * You may use the result of {@link getErrors} as the value for this parameter.
+	 * @since 1.0.5
+	 */
+	public function addErrors($errors)
+	{
+		foreach($errors as $attribute=>$error)
+		{
+			if(is_array($error))
+			{
+				foreach($error as $e)
+					$this->_errors[$attribute][]=$e;
+			}
+			else
+				$this->_errors[$attribute][]=$error;
+		}
+	}
+
+	/**
+	 * Removes errors for all attributes or a single attribute.
+	 * @param string attribute name. Use null to remove errors for all attribute.
+	 */
+	public function clearErrors($attribute=null)
+	{
+		if($attribute===null)
+			$this->_errors=array();
+		else
+			unset($this->_errors[$attribute]);
+	}
+
+	/**
+	 * Generates a user friendly attribute label.
+	 * This is done by replacing underscores or dashes with blanks and
+	 * changing the first letter of each word to upper case.
+	 * For example, 'department_name' or 'DepartmentName' becomes 'Department Name'.
+	 * @param string the column name
+	 * @return string the attribute label
+	 */
+	public function generateAttributeLabel($name)
+	{
+		return ucwords(trim(strtolower(str_replace(array('-','_'),' ',preg_replace('/(?<![A-Z])[A-Z]/', ' \0', $name)))));
+	}
+
+	/**
+	 * Returns all attribute values.
+	 * @param array list of attributes whose value needs to be returned.
+	 * Defaults to null, meaning all attributes as listed in {@link attributeNames} will be returned.
+	 * If it is an array, only the attributes in the array will be returned.
+	 * @return array attribute values (name=>value).
+	 */
+	public function getAttributes($names=null)
+	{
+		$values=array();
+		foreach($this->attributeNames() as $name)
+			$values[$name]=$this->$name;
+
+		if(is_array($names))
+		{
+			$values2=array();
+			foreach($names as $name)
+				$values2[$name]=isset($values[$name]) ? $values[$name] : null;
+			return $values2;
+		}
+		else
+			return $values;
+	}
+
+	/**
+	 * Sets the attribute values in a massive way.
+	 * @param array attribute values (name=>value) to be set.
+	 * @param boolean whether the assignments should only be done to the safe attributes.
+	 * A safe attribute is one that is associated with a validation rule in the current {@link scenario}.
+	 * @see getSafeAttributeNames
+	 * @see attributeNames
+	 */
+	public function setAttributes($values,$safeOnly=true)
+	{
+		if(!is_array($values))
+			return;
+		$attributes=array_flip($safeOnly ? $this->getSafeAttributeNames() : $this->attributeNames());
+		foreach($values as $name=>$value)
+		{
+			if(isset($attributes[$name]))
+				$this->$name=$value;
+		}
+	}
+
+	/**
+	 * Returns the scenario that this model is used in.
+	 *
+	 * Scenario affects how validation is performed and which attributes can
+	 * be massively assigned.
+	 *
+	 * A validation rule will be performed when calling {@link validate()}
+	 * if its 'on' option is not set or contains the current scenario value.
+	 *
+	 * And an attribute can be massively assigned if it is associated with
+	 * a validation rule for the current scenario. Note that an exception is
+	 * the {@link CUnsafeValidator unsafe} validator which marks the associated
+	 * attributes as unsafe and not allowed to be massively assigned.
+	 *
+	 * @return string the scenario that this model is in.
+	 * @since 1.0.4
+	 */
+	public function getScenario()
+	{
+		return $this->_scenario;
+	}
+
+	/**
+	 * @param string the scenario that this model is in.
+	 * @see getScenario
+	 * @since 1.0.4
+	 */
+	public function setScenario($value)
+	{
+		$this->_scenario=$value;
+	}
+
+	/**
+	 * Returns the attribute names that are safe to be massively assigned.
+	 * A safe attribute is one that is associated with a validation rule in the current {@link scenario}.
+	 * @return array safe attribute names
+	 * @since 1.0.2
+	 * 
+	 * @TODO Port validators from Yii to Prado? Not used in ActiveRecords -> ignoring this for now...
+	 * 
+	 */
+	public function getSafeAttributeNames()
+	{
+		$attributes=array();
+		$unsafe=array();
+		foreach($this->getValidators() as $validator)
+		{
+#			if($validator instanceof CUnsafeValidator)
+#			{
+#				foreach($validator->attributes as $name)
+#					$unsafe[]=$name;
+#			}
+#			else
+#			{
+				foreach($validator->attributes as $name)
+					$attributes[$name]=true;
+#			}
+		}
+
+#		foreach($unsafe as $name)
+#			unset($attributes[$name]);
+		return array_keys($attributes);
+	}
+
+	/**
+	 * Returns an iterator for traversing the attributes in the model.
+	 * This method is required by the interface IteratorAggregate.
+	 * @return CMapIterator an iterator for traversing the items in the list.
+	 */
+	public function getIterator()
+	{
+		$attributes=$this->getAttributes();
+		return new TMapIterator($attributes);
+	}
+
+	/**
+	 * Returns whether there is an element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param mixed the offset to check on
+	 * @return boolean
+	 * @since 1.0.2
+	 */
+	public function offsetExists($offset)
+	{
+		return property_exists($this,$offset);
+	}
+
+	/**
+	 * Returns the element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param integer the offset to retrieve element.
+	 * @return mixed the element at the offset, null if no element is found at the offset
+	 * @since 1.0.2
+	 */
+	public function offsetGet($offset)
+	{
+		return $this->$offset;
+	}
+
+	/**
+	 * Sets the element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param integer the offset to set element
+	 * @param mixed the element value
+	 * @since 1.0.2
+	 */
+	public function offsetSet($offset,$item)
+	{
+		$this->$offset=$item;
+	}
+
+	/**
+	 * Unsets the element at the specified offset.
+	 * This method is required by the interface ArrayAccess.
+	 * @param mixed the offset to unset element
+	 * @since 1.0.2
+	 */
+	public function offsetUnset($offset)
+	{
+		unset($this->$offset);
+	}
+}
diff --git a/framework/Base/TModelBehavior.php b/framework/Base/TModelBehavior.php
new file mode 100644
index 00000000..a5182e8f
--- /dev/null
+++ b/framework/Base/TModelBehavior.php
@@ -0,0 +1,57 @@
+<?php
+/**
+ * CModelBehavior class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+/**
+ * CModelBehavior is a base class for behaviors that are attached to a model component.
+ * The model should extend from {@link CModel} or its child classes.
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CModelBehavior.php 1082 2009-06-01 12:03:00Z qiang.xue $
+ * @package system.base
+ * @since 1.0.2
+ */
+ 
+Prado::using('System.Base.TBehavior');
+ 
+class TModelBehavior extends TBehavior
+{
+	/**
+	 * Declares events and the corresponding event handler methods.
+	 * The default implementation returns 'onBeforeValidate' and 'onAfterValidate' events and handlers.
+	 * If you override this method, make sure you merge the parent result to the return value.
+	 * @return array events (array keys) and the corresponding event handler methods (array values).
+	 * @see CBehavior::events
+	 */
+	public function events()
+	{
+		return array(
+			'onBeforeValidate'=>'beforeValidate',
+			'onAfterValidate'=>'afterValidate',
+		);
+	}
+
+	/**
+	 * Responds to {@link CModel::onBeforeValidate} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link owner}.
+	 * You may set {@link CModelEvent::isValid} to be false if you want to stop the current validation process.
+	 * @param CModelEvent event parameter
+	 */
+	public function beforeValidate($event)
+	{
+	}
+
+	/**
+	 * Responds to {@link CModel::onAfterValidate} event.
+	 * Overrides this method if you want to handle the corresponding event of the {@link owner}.
+	 * @param CEvent event parameter
+	 */
+	public function afterValidate($event)
+	{
+	}
+}
diff --git a/framework/Base/TModelEvent.php b/framework/Base/TModelEvent.php
new file mode 100644
index 00000000..1bf42a2b
--- /dev/null
+++ b/framework/Base/TModelEvent.php
@@ -0,0 +1,30 @@
+<?php
+/**
+ * CModelEvent class file.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright &copy; 2008-2009 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+Prado::using('System.Base.TEvent');
+
+/**
+ * CModelEvent class.
+ *
+ * CModelEvent represents the event parameters needed by events raised by a model.
+ *
+ * @author Qiang Xue <qiang.xue@gmail.com>
+ * @version $Id: CModelEvent.php 1093 2009-06-05 13:09:17Z qiang.xue $
+ * @package system.base
+ * @since 1.0
+ */
+class TModelEvent extends TEvent
+{
+	/**
+	 * @var boolean whether the model is valid. Defaults to true.
+	 * If this is set false, {@link CModel::validate()} will return false and quit the current validation process.
+	 */
+	public $isValid=true;
+}