org.eclipse.e4.core.di.suppliers

Interface IObjectDescriptor

public interface IObjectDescriptor

This interface describes objects created by the dependency injection.

From the view point of the injector, objects are described by a type with a set of optional qualifiers.

Since:

1.7

See Also:

Qualifier

Restriction:

This interface is not intended to be implemented by clients.

Restriction:

This interface is not intended to be extended by clients.

Method Summary

Modifier and Type	Method and Description
java.lang.reflect.Type	getDesiredType() The formal type that the objects should be assignable to.
<T extends java.lang.annotation.Annotation> T	getQualifier(java.lang.Class<T> clazz) Returns an instance of the qualifier, if it is present in this descriptor, or null.
java.lang.annotation.Annotation[]	getQualifiers() Returns qualifiers specified for this object descriptor, or null.
boolean	hasQualifier(java.lang.Class<? extends java.lang.annotation.Annotation> clazz) Use this method to find out if the object descriptor has a qualifier.

Method Detail

getDesiredType

java.lang.reflect.Type getDesiredType()

The formal type that the objects should be assignable to.

Returns:

the expected object's type

hasQualifier

boolean hasQualifier(java.lang.Class<? extends java.lang.annotation.Annotation> clazz)

Use this method to find out if the object descriptor has a qualifier.

Parameters:

clazz - qualifier

Returns:

true if the object descriptor has the qualifier; falseotherwise

getQualifier

<T extends java.lang.annotation.Annotation> T getQualifier(java.lang.Class<T> clazz)

Returns an instance of the qualifier, if it is present in this descriptor, or null.

Type Parameters:

T - qualifier class

Parameters:

clazz - the qualifier's class

Returns:

the qualifier instance, if present, or null

getQualifiers

java.lang.annotation.Annotation[] getQualifiers()

Returns qualifiers specified for this object descriptor, or null.

Returns:

qualifiers for this descriptor, or null if there are no qualifiers specified