Package org.eclipse.emfforms.internal.swt.core.di

Class RendererSupplier

java.lang.Object

org.eclipse.e4.core.di.suppliers.ExtendedObjectSupplier

org.eclipse.emf.ecp.view.spi.common.di.ContextBasedObjectSupplier<Renderer,AbstractSWTRenderer<? extends VElement>>

org.eclipse.emfforms.internal.swt.core.di.RendererSupplier

public class RendererSupplier
extends ContextBasedObjectSupplier<Renderer,AbstractSWTRenderer<? extends VElement>>

Eclipse DI supplier of the renderer dependency. Resolvable only in a context that has both the VElement and the ViewModelContext available.

Field Summary

Fields inherited from class org.eclipse.e4.core.di.suppliers.ExtendedObjectSupplier

SERVICE_CONTEXT_KEY, SERVICE_NAME

Constructor Summary

Constructors

Constructor	Description
RendererSupplier()	Initializes me.

Method Summary

Modifier and Type	Method	Description
protected boolean	checkDependencies(Renderer qualifier, java.lang.Class<? extends AbstractSWTRenderer<? extends VElement>> requestedType, org.eclipse.e4.core.contexts.IEclipseContext context)	Check whether the Eclipse context has the dependencies required to compute my result.
protected java.util.Optional<? extends AbstractSWTRenderer<? extends VElement>>	compute(Renderer qualifier, java.lang.Class<? extends AbstractSWTRenderer<? extends VElement>> requestedType, org.eclipse.e4.core.contexts.IEclipseContext context)	Compute my value from the Eclipse context.

Methods inherited from class org.eclipse.emf.ecp.view.spi.common.di.ContextBasedObjectSupplier

get

Methods inherited from class java.lang.Object

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

Constructor Detail

RendererSupplier

public RendererSupplier()

Initializes me.

Method Detail

checkDependencies

protected boolean checkDependencies(Renderer qualifier,
                                    java.lang.Class<? extends AbstractSWTRenderer<? extends VElement>> requestedType,
                                    org.eclipse.e4.core.contexts.IEclipseContext context)

Description copied from class: ContextBasedObjectSupplier

Check whether the Eclipse context has the dependencies required to compute my result. The default implementation just attempts to compute the result, which is useful for simple cases where the computation is not expensive and does not have undesired side-effects if it fails.

Overrides:

checkDependencies in class ContextBasedObjectSupplier<Renderer,AbstractSWTRenderer<? extends VElement>>

Parameters:

qualifier - the qualifier annotation, which may have attributes required for the computation

requestedType - the type requested for injection

context - the Eclipse context

Returns:

true if I can compute a value from this context; false, otherwise

See Also:

#compute(Annotation, IEclipseContext)

compute

protected java.util.Optional<? extends AbstractSWTRenderer<? extends VElement>> compute(Renderer qualifier,
                                                                                        java.lang.Class<? extends AbstractSWTRenderer<? extends VElement>> requestedType,
                                                                                        org.eclipse.e4.core.contexts.IEclipseContext context)

Description copied from class: ContextBasedObjectSupplier

Compute my value from the Eclipse context. An empty result indicates that the value does not exist (the IInjector.NOT_A_VALUE special result for the object-supplier protocol). Injection of null values is not supported.

Specified by:

compute in class ContextBasedObjectSupplier<Renderer,AbstractSWTRenderer<? extends VElement>>

Parameters:

qualifier - the qualifier annotation, which may have attributes required for the computation

requestedType - the type requested for injection

context - the Eclipse context

Returns:

the result of the computation (possibly empty, but not null)