com.vaadin.flow.di

Class DefaultInstantiator

java.lang.Object

com.vaadin.flow.di.DefaultInstantiator

All Implemented Interfaces:

Instantiator, Serializable

public class DefaultInstantiator
extends Object
implements Instantiator

Default instantiator that is used if no other instantiator has been registered. This implementation uses vanilla Java mechanisms such as Class.newInstance() and ServiceLoader.

Since:

1.0

Author:

Vaadin Ltd

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
DefaultInstantiator(VaadinService service) Creates a new instantiator for the given service.

Method Summary

Modifier and Type	Method and Description
<T extends Component> T	createComponent(Class<T> componentClass) Creates an instance of a component by its componentClass.
I18NProvider	getI18NProvider() Get the I18NProvider if one has been defined.
<T> T	getOrCreate(Class<T> type) Provides an instance of any given type, this is an abstraction that allows to make use of DI-frameworks from add-ons.
Stream<VaadinServiceInitListener>	getServiceInitListeners() Gets all service init listeners to use.
static Stream<VaadinServiceInitListener>	getServiceLoaderListeners(ClassLoader classloader) Helper for finding service init listeners using ServiceLoader.
boolean	init(VaadinService service) Initializes this instantiator.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.vaadin.flow.di.Instantiator

createRouteTarget, get, getBootstrapListeners, getDependencyFilters

Constructor Detail

DefaultInstantiator

public DefaultInstantiator(VaadinService service)

Creates a new instantiator for the given service.

Parameters:

service - the service to use

Method Detail

init

public boolean init(VaadinService service)

Description copied from interface: Instantiator

Initializes this instantiator. This method is run only once and before running any other method. An implementation can opt-out from being used by returning false. It is recommended that all implementations provide a way for application developers to disable an implementation so that it can be present on the classpath without preventing the application from being deployed in cases when multiple candidates are available.

Specified by:

init in interface Instantiator

Parameters:

service - the Vaadin service for which this instance is initialized

Returns:

true if this instance should be considered as a candidate for usage for the provided service; false to opt-out from the selection process

getServiceInitListeners

public Stream<VaadinServiceInitListener> getServiceInitListeners()

Description copied from interface: Instantiator

Gets all service init listeners to use. In addition to listeners defined in some way native to a specific instantiator, it is also recommended to support the default ServiceLoader convention. This can be done by including the items from getServiceInitListeners() in the returned stream.

Specified by:

getServiceInitListeners in interface Instantiator

Returns:

stream of service init listeners, not null

getOrCreate

public <T> T getOrCreate(Class<T> type)

Description copied from interface: Instantiator

Provides an instance of any given type, this is an abstraction that allows to make use of DI-frameworks from add-ons.

How the object is created and whether it is being cached or not is up to the implementation.

Specified by:

getOrCreate in interface Instantiator

Type Parameters:

T - the type of the instance to create

Parameters:

type - the instance type to create, not null

Returns:

an instance of the given type

createComponent

public <T extends Component> T createComponent(Class<T> componentClass)

Description copied from interface: Instantiator

Creates an instance of a component by its componentClass.

Specified by:

createComponent in interface Instantiator

Type Parameters:

T - the component type

Parameters:

componentClass - the instance type to create, not null

Returns:

the created instance, not null

getServiceLoaderListeners

public static Stream<VaadinServiceInitListener> getServiceLoaderListeners(ClassLoader classloader)

Helper for finding service init listeners using ServiceLoader.

Parameters:

classloader - the classloader to use for finding the listeners

Returns:

a stream of service init listeners

getI18NProvider

public I18NProvider getI18NProvider()

Description copied from interface: Instantiator

Get the I18NProvider if one has been defined.

Specified by:

getI18NProvider in interface Instantiator

Returns:

I18NProvier instance