DataSource Class Reference

Use data sources to separate the user interface from the application data and to remove the dependencies between a Kanzi Studio project and the application code which define the Kanzi application. More...

Inheritance diagram for DataSource:

Public Member Functions
void	close ()
	Close the object, and release native resources.
DataObject	getData ()
	Retrieves the root object of the underlying data tree.
DataContext	lookupDataContext (String relativePath)
	Performs object look-up by path.
Public Member Functions inherited from DataContext
ModifiedSubscriptionToken	addModifiedNotificationHandler (ModifiedSubscriptionFunction modifiedHandlerFunction)
	Allows to subscribe to modifications in this data context.
void	notifyModified ()
	Triggers modification procedure in this data context, which invokes the subscriptions.
void	removeModifiedNotificationHandler (DataContext.ModifiedSubscriptionToken token)
	Removes a modification subscription.
Public Member Functions inherited from Resource
String	getName ()
	Gets the resource name.
String	getUrl ()
	Gets the resource URL.
void	setKeepAlive (boolean keepAlive)
	Sets the keep alive flag.
Public Member Functions inherited from KanziObject
boolean	equals (Object object)
Domain	getDomain ()
	Returns the domain the object belongs to.
Metaclass	getDynamicMetaclass ()
	Returns the metaclass of the dynamic type of the object.
long	getNative ()
	Gets a pointer to the backing C++ instance.
TDataType	getOptionalProperty (PropertyType< TDataType > propertyType)
	Returns the current value of a property type, but does not use the default value if there are no inputs to the property value.
TDataType	getProperty (PropertyType< TDataType > propertyType)
	Returns the current value of a property type.
int	hashCode ()
boolean	hasValue (PropertyType< TDataType > propertyType)
	Evaluates whether there are any inputs into the property value.
boolean	isStale ()
	Test if the object is stale i.e.
void	removeLocalValue (PropertyType< TDataType > propertyType)
	Removes the local value associated with the property.
void	setProperty (PropertyType< TDataType > propertyType, TDataType value)
	Sets the local value of a property type.
ObjectRef< TType >	tryCreateObjectRef (Class< TType > clazz)
	Tries to create an owning ObjectRef instance to this KanziObject.

Static Public Attributes
static final Metaclass	metaclass
	The Metaclass for the class.
Static Public Attributes inherited from DataContext
static final Metaclass	metaclass
	The Metaclass for the class.
Static Public Attributes inherited from Resource
static final Metaclass	metaclass
	The Metaclass for the class.
Static Public Attributes inherited from KanziObject
static final Metaclass	metaclass = new AbstractMetaclass("Kanzi.Object")
	The Metaclass for the class.

Protected Member Functions
	DataSource (Domain domain, long nativeObject, Metaclass metaclass)
	Wraps a given native DataSource Called by KanziObject.connectResource(long) when connecting to a native DataSource.
void	initialize ()
	Initializes the DataSource.
void	onLoaded ()
	Override function called after loadFromKZB.

Static Protected Member Functions
static< Derived extends DataSource > ObjectRef< Derived >	createDerived (Domain domain, String name, Metaclass metaclass)
	Creates a derived class instance.

Additional Inherited Members
Public Attributes inherited from ResourceMetadata
AbstractMetaclass	metaclass = new AbstractMetaclass("Kanzi.Resource")
	Metaclass for Resource.
Public Attributes inherited from DataContextMetadata
DynamicPropertyType< Resource >	DataContextProperty
	Source of data for this node and its descendants.
DynamicPropertyType< Resource >	ItemsSourceProperty
	Data object which provides data sources for list items.
AbstractMetaclass	metaclass = new AbstractMetaclass("Kanzi.DataContext")
	Metaclass for DataContext.
Public Attributes inherited from DataSourceMetadata
AbstractMetaclass	metaclass = new AbstractMetaclass("Kanzi.DataSource")
	Metaclass for DataSource.

Detailed Description

Use data sources to separate the user interface from the application data and to remove the dependencies between a Kanzi Studio project and the application code which define the Kanzi application.

Kanzi allows you to define the format and structure of your data source by defining a Kanzi Engine data source plugin.

When you use a data source in a Kanzi application you bind the values of properties and property fields to data that comes from a data source. This binding establishes a connection between a node or a resource and the application data. When data in the data source changes, the nodes and resources which are bound to the data reflect the change in the data.

To set a node to use a data source, use the DataContext.DataContext property. When you set the Data Context property for a node, all its child nodes inherit the value of the Data Context property. After you set a node to use a data source, you can use bindings to access the data.

Constructor & Destructor Documentation

DataSource()

DataSource ( Domain domain, long nativeObject, Metaclass metaclass )

protected

Wraps a given native DataSource Called by KanziObject.connectResource(long) when connecting to a native DataSource.

Parameters

domain	UI Domain where this DataSource belongs
nativeObject	Native object that is backing this DataSource
metaclass	Metaclass data for this DataSource

Member Function Documentation

createDerived()

static< Derived extends DataSource > ObjectRef< Derived > createDerived ( Domain domain, String name, Metaclass metaclass )

staticprotected

Creates a derived class instance.

Call this method as part of the create method for a derived class.

Parameters

domain	UI Domain where this data source belongs.
name	Name of the data source
metaclass	Metaclass data of the data source.

Returns

An ObjectRef that holds the created instance.

getData()

DataObject getData

(

)

Retrieves the root object of the underlying data tree.

Returns

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

Reimplemented from DataContext.

lookupDataContext()

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 empty pointer if there was no such object.

Reimplemented from DataContext.

Member Data Documentation

metaclass

final Metaclass metaclass

static

Initial value:

=
        com.rightware.kanzi.metadata.DataSourceMetadata.metaclass

The Metaclass for the class.