org.junit.jupiter.api.extension

Interface ParameterContext

All Known Implementing Classes:

DefaultParameterContext

@API(status=STABLE,
     since="5.0")
public interface ParameterContext

ParameterContext encapsulates the context in which an Executable will be invoked for a given Parameter.

A ParameterContext is used to support parameter resolution via a ParameterResolver.

Since:

5.0

See Also:

ParameterResolver, Parameter, Executable, Method, Constructor

Method Summary

Modifier and Type	Method and Description
<A extends java.lang.annotation.Annotation> java.util.Optional<A>	findAnnotation(java.lang.Class<A> annotationType) Find the first annotation of annotationType that is either present or meta-present on the Parameter for this context.
<A extends java.lang.annotation.Annotation> java.util.List<A>	findRepeatableAnnotations(java.lang.Class<A> annotationType) Find all repeatable annotations of annotationType that are either present or meta-present on the Parameter for this context.
default java.lang.reflect.Executable	getDeclaringExecutable() Get the Executable (i.e., the Method or Constructor) that declares the Parameter for this context.
int	getIndex() Get the index of the Parameter for this context within the parameter list of the Executable that declares the parameter.
java.lang.reflect.Parameter	getParameter() Get the Parameter for this context.
java.util.Optional<java.lang.Object>	getTarget() Get the target on which the Executable that declares the Parameter for this context will be invoked, if available.
boolean	isAnnotated(java.lang.Class<? extends java.lang.annotation.Annotation> annotationType) Determine if an annotation of annotationType is either present or meta-present on the Parameter for this context.

Method Detail

getParameter

java.lang.reflect.Parameter getParameter()

Get the Parameter for this context.

WARNING

When searching for annotations on the parameter in this context, favor isAnnotated(Class), findAnnotation(Class), and findRepeatableAnnotations(Class) over methods in the Parameter API due to a bug in javac on JDK versions prior to JDK 9.

Returns:

the parameter; never null

See Also:

getIndex()

getIndex

int getIndex()

Get the index of the Parameter for this context within the parameter list of the Executable that declares the parameter.

Returns:

the index of the parameter

See Also:

getParameter(), Executable.getParameters()

getDeclaringExecutable

default java.lang.reflect.Executable getDeclaringExecutable()

Get the Executable (i.e., the Method or Constructor) that declares the Parameter for this context.

Returns:

the declaring Executable; never null

See Also:

Parameter.getDeclaringExecutable()

getTarget

java.util.Optional<java.lang.Object> getTarget()

Get the target on which the Executable that declares the Parameter for this context will be invoked, if available.

Returns:

an Optional containing the target on which the Executable will be invoked; never null but will be empty if the Executable is a constructor or a static method.

isAnnotated

boolean isAnnotated(java.lang.Class<? extends java.lang.annotation.Annotation> annotationType)

Determine if an annotation of annotationType is either present or meta-present on the Parameter for this context.

WARNING

Favor the use of this method over directly invoking AnnotatedElement.isAnnotationPresent(Class) due to a bug in javac on JDK versions prior to JDK 9.

Parameters:

annotationType - the annotation type to search for; never null

Returns:

true if the annotation is present or meta-present

Since:

5.1.1

See Also:

findAnnotation(Class), findRepeatableAnnotations(Class)

findAnnotation

<A extends java.lang.annotation.Annotation> java.util.Optional<A> findAnnotation(java.lang.Class<A> annotationType)

Find the first annotation of annotationType that is either present or meta-present on the Parameter for this context.

WARNING

Favor the use of this method over directly invoking annotation lookup methods in the Parameter API due to a bug in javac on JDK versions prior to JDK 9.

Type Parameters:

A - the annotation type

Parameters:

annotationType - the annotation type to search for; never null

Returns:

an Optional containing the annotation; never null but potentially empty

Since:

5.1.1

See Also:

isAnnotated(Class), findRepeatableAnnotations(Class)

findRepeatableAnnotations

<A extends java.lang.annotation.Annotation> java.util.List<A> findRepeatableAnnotations(java.lang.Class<A> annotationType)

Find all repeatable annotations of annotationType that are either present or meta-present on the Parameter for this context.

WARNING

Favor the use of this method over directly invoking annotation lookup methods in the Parameter API due to a bug in javac on JDK versions prior to JDK 9.

Type Parameters:

A - the annotation type

Parameters:

annotationType - the repeatable annotation type to search for; never null

Returns:

the list of all such annotations found; neither null nor mutable, but potentially empty

Since:

5.1.1

See Also:

isAnnotated(Class), findAnnotation(Class), Repeatable