DataContext Class Reference

DataContext acts as a container for data. More...

Inheritance diagram for DataContext:

Collaboration diagram for DataContext:

Classes
interface	ModifiedSubscriptionFunction
	Callback functions for Modified Subscription events. More...
class	ModifiedSubscriptionToken
	Token to represent a Modified Subscription. More...

Public Member Functions
ModifiedSubscriptionToken	addModifiedNotificationHandler (ModifiedSubscriptionFunction modifiedHandlerFunction)
	Allows to subscribe to modifications in this data context. More...
DataObject	getData ()
	Retrieves the root object of the underlying data tree. More...
DataContext	lookupDataContext (String relativePath)
	Performs object look up by path. More...
void	notifyModified ()
	Triggers modification procedure in this data context, which invokes the subscriptions.
void	removeModifiedNotificationHandler (DataContext.ModifiedSubscriptionToken token)
	Removes a modification subscription. More...
Public Member Functions inherited from Resource
String	getName ()
	Gets the resource name. More...
String	getUrl ()
	Gets the resource URL. More...
void	setKeepAlive (boolean keepAlive)
	Sets the keep alive flag. More...
Public Member Functions inherited from KanziObject
boolean	equals (Object object)
Domain	getDomain ()
	Returns the domain the object belongs to. More...
Metaclass	getDynamicMetaclass ()
	Returns the metaclass of the dynamic type of the object. More...
boolean	isStale ()
	Test if the object is stale i.e. More...
void	releaseOwnership ()
	Release ownership of the backing native object from this object. More...
void	removeLocalValue (PropertyType propertyType)
	Removes the local value associated with the property. More...
boolean	takeOwnership ()
	Take ownership of the backing native object in this object. More...

Static Public Member Functions
static Metaclass	getStaticMetaclass ()
	Returns the metaclass of this class. More...
Static Public Member Functions inherited from KanziObject
static Metaclass	getStaticMetaclass ()
	Returns the metaclass of this class. More...

Additional Inherited Members
Public Attributes inherited from DataContext
AbstractMetaclass	DataContextMetaclass = new AbstractMetaclass("Kanzi.DataContext")
DynamicPropertyType< Resource >	DataContextProperty
DynamicPropertyType< Resource >	ItemsSourceProperty

Detailed Description

DataContext acts as a container for data.

All data within the data context is described as a tree of data objects. The class provides access and look-up functionality of the contained data objects.

Member Function Documentation

ModifiedSubscriptionToken addModifiedNotificationHandler

(

ModifiedSubscriptionFunction

modifiedHandlerFunction

)

Allows to subscribe to modifications in this data context.

Parameters

modifiedHandlerFunction

Callback that is invoked when a change occurs in this data context.

Returns

Token that can be used to identify and remove a given subscription.

DataObject getData

(

)

Retrieves the root object of the underlying data tree.

Returns

The data object that is the root of the data tree.

static Metaclass getStaticMetaclass ( )

static

Returns the metaclass of this class.

Returns

Static instance of metaclass of this data context.

DataContext lookupDataContext

(

String

relativePath

)

Performs object look up by path.

Parameters

relativePath

Path of the object where to look at, separated by '.'

Returns

Data object that was found, or null if there was no such object.

void removeModifiedNotificationHandler

(

DataContext.ModifiedSubscriptionToken

token

)

Removes a modification subscription.

Parameters

token

Token to identify the subscription that should be removed.