com.vaadin.server

Class UIProvider

java.lang.Object

com.vaadin.server.UIProvider

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

DefaultUIProvider, LegacyApplicationUIProvider

public abstract class UIProvider
extends Object
implements Serializable

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
UIProvider()

Method Summary

Modifier and Type	Method and Description
UI	createInstance(UICreateEvent event)
protected static <T extends Annotation> T	getAnnotationFor(Class<?> clazz, Class<T> annotationType) Helper to get an annotation for a class.
String	getPageTitle(UICreateEvent event)
PushMode	getPushMode(UICreateEvent event) Finds the PushMode to use for a specific UI.
Transport	getPushTransport(UICreateEvent event) Finds the Transport to use for a specific UI.
String	getTheme(UICreateEvent event) Finds the theme to use for a specific UI.
abstract Class<? extends UI>	getUIClass(UIClassSelectionEvent event)
String	getWidgetset(UICreateEvent event) Deprecated. This method has been replaced by getWidgetsetInfo(UICreateEvent) in 7.7
WidgetsetInfo	getWidgetsetInfo(UICreateEvent event) Finds the widgetset to use for a specific UI.
boolean	isPreservedOnRefresh(UICreateEvent event) Checks whether the same UI state should be reused if the framework can detect that the application is opened in a browser window where it has previously been open.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

UIProvider

public UIProvider()

Method Detail

getUIClass

public abstract Class<? extends UI> getUIClass(UIClassSelectionEvent event)

createInstance

public UI createInstance(UICreateEvent event)

getAnnotationFor

protected static <T extends Annotation> T getAnnotationFor(Class<?> clazz,
                                                           Class<T> annotationType)

Helper to get an annotation for a class. If the annotation is not present on the target class, its super classes and directly implemented interfaces are also searched for the annotation. Interfaces implemented by superclasses are not taken into account.

Note that searching implemented interfaces for @Inherited annotations and searching for superclasses for non-inherited annotations do not follow the standard semantics and are supported for backwards compatibility. Future versions of the framework might only support the standard semantics of @Inherited.

Parameters:

clazz - the class from which the annotation should be found

annotationType - the annotation type to look for

Returns:

an annotation of the given type, or null if the annotation is not present on the class

getTheme

public String getTheme(UICreateEvent event)

Finds the theme to use for a specific UI. If no specific theme is required, null is returned.

The default implementation checks for a @Theme annotation on the UI class.

Parameters:

event - the UI create event with information about the UI and the current request.

Returns:

the name of the theme, or null if the default theme should be used

getWidgetset

@Deprecated
public String getWidgetset(UICreateEvent event)

Deprecated. This method has been replaced by getWidgetsetInfo(UICreateEvent) in 7.7

Finds the widgetset to use for a specific UI. If no specific widgetset is required, null is returned.

This method uses the Widgetset definition priority order from getWidgetsetInfo(UICreateEvent).

Note: This method exists only for backwards compatibility and overriding it won't have the effect it used to.

Parameters:

event - the UI create event with information about the UI and the current request.

Returns:

the name of the widgetset, or null if the default widgetset should be used

getWidgetsetInfo

public WidgetsetInfo getWidgetsetInfo(UICreateEvent event)

Finds the widgetset to use for a specific UI. If no specific widgetset is required, null is returned.

The default implementation uses the following order of priority for finding the widgetset information:

• @Widgetset annotation if it is defined for the UI class
• The class AppWidgetset if one exists in the default package
• A widgetset called AppWidgetset if there is an AppWidgetset.gwt.xml file in the default package
• null to use the default widgetset otherwise

Parameters:

event - the UI create event with information about the UI and the current request.

Returns:

the widgetset info, or null if the default widgetset should be used

Since:

7.7

isPreservedOnRefresh

public boolean isPreservedOnRefresh(UICreateEvent event)

Checks whether the same UI state should be reused if the framework can detect that the application is opened in a browser window where it has previously been open. The framework attempts to discover this by checking the value of window.name in the browser.

Whenever a preserved UI is reused, its refresh method is invoked by the framework first.

Parameters:

event - the UI create event with information about the UI and the current request.

Returns:

trueif the same UI instance should be reused e.g. when the browser window is refreshed.

getPageTitle

public String getPageTitle(UICreateEvent event)

getPushMode

public PushMode getPushMode(UICreateEvent event)

Finds the PushMode to use for a specific UI. If no specific push mode is required, null is returned.

The default implementation uses the @Push annotation if it's defined for the UI class.

Parameters:

event - the UI create event with information about the UI and the current request.

Returns:

the push mode to use, or null if the default push mode should be used

getPushTransport

public Transport getPushTransport(UICreateEvent event)

Finds the Transport to use for a specific UI. If no transport is defined, null is returned.

The default implementation uses the @Push annotation if it's defined for the UI class.

Parameters:

event - the UI create event with information about the UI and the current request.

Returns:

the transport type to use, or null if the default transport type should be used