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com.vaadin.flow.spring.
Package com.vaadin.flow.spring

Class SpringInstantiator

java.lang.Object
com.vaadin.flow.di.DefaultInstantiator
com.vaadin.flow.spring.SpringInstantiator

All Implemented Interfaces:

Instantiator, Serializable

public class SpringInstantiator extends DefaultInstantiator

Default Spring instantiator that is used if no other instantiator has been registered. This implementation uses Spring beans.

Author:

Vaadin Ltd

See Also:

  • Constructor Details

    • SpringInstantiator

      public SpringInstantiator(VaadinService service, org.springframework.context.ApplicationContext context)

      Creates a new spring instantiator instance.

      Parameters:

      service - the service to use

      context - the application context

  • Method Details

    • getServiceInitListeners

      public Stream<VaadinServiceInitListener> getServiceInitListeners()

      Gets all service init listeners to use. Registers by default an init listener that publishes ServiceInitEvent to application context.

      Specified by:

      getServiceInitListeners in interface Instantiator

      Overrides:

      getServiceInitListeners in class DefaultInstantiator

      Returns:

      stream of service init listeners, not null

    • 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

      Overrides:

      createComponent in class DefaultInstantiator

      Type Parameters:

      T - the component type

      Parameters:

      componentClass - the instance type to create, not null

      Returns:

      the created instance, not null

    • getI18NProvider

      public I18NProvider getI18NProvider()

      Description copied from interface: Instantiator

      Get the I18NProvider if one has been defined.

      Specified by:

      getI18NProvider in interface Instantiator

      Overrides:

      getI18NProvider in class DefaultInstantiator

      Returns:

      I18NProvider instance

    • getMenuAccessControl

      public MenuAccessControl getMenuAccessControl()

      Description copied from interface: Instantiator

      Get the MenuAccessControl.

      Specified by:

      getMenuAccessControl in interface Instantiator

      Overrides:

      getMenuAccessControl in class DefaultInstantiator

      Returns:

      MenuAccessControl instance

    • getOrCreate

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

      Hands over an existing bean or tries to instantiate one with the following rules:

      • If exactly one bean is present in the context, it returns this bean.
      • If no bean is present, it tries to instantiate one.
      • If more than one bean is present, it tries to instantiate one but in case of a Bean instantiation exception this exception is catched and rethrown with a hint. Reason for this is, that users may expect it to "use" a bean but have multiple in the context. So the hint helps them find the problem.

      Specified by:

      getOrCreate in interface Instantiator

      Overrides:

      getOrCreate in class DefaultInstantiator

      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

    • getApplicationClass

      public Class<?> getApplicationClass(Class<?> clazz)

      Description copied from interface: Instantiator

      Return the application-defined class for the given class: usually simply the given class, but the original class in case of a runtime generated subclass.

      Parameters:

      clazz - the class to check

      Returns:

      the user-defined class

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