JUnit 5 5.10.2 · org.junit.jupiter.api.extension.ParameterResolver

ParameterResolver defines the API for Extensions that wish to dynamically resolve arguments for parameters at runtime.

If a constructor for a test class or a @Test, @BeforeEach, @AfterEach, @BeforeAll, or @AfterAll method declares a parameter, an argument for the parameter must be resolved at runtime by a ParameterResolver.

Constructor Requirements

Consult the documentation in Extension for details on constructor requirements.

Method Summary

Modifier and Type Method and Description

Modifier and Type	Method and Description
public Object	Returns: the resolved argument for the parameter; may only be `null` if the parameter type is not a primitive resolveParameter(ParameterContext the context for the parameter for which an argument should be resolved; never `null` parameterContext, ExtensionContext the extension context for the `Executable` about to be invoked; never `null` extensionContext) Resolve an argument for the `Parameter` in the supplied `ParameterContext` for the supplied `ExtensionContext`.
public boolean	Returns: `true` if this resolver can resolve an argument for the parameter supportsParameter(ParameterContext the context for the parameter for which an argument should be resolved; never `null` parameterContext, ExtensionContext the extension context for the `Executable` about to be invoked; never `null` extensionContext) Determine if this resolver supports resolution of an argument for the `Parameter` in the supplied `ParameterContext` for the supplied `ExtensionContext`.

public Object

Returns:

the resolved argument for the parameter; may only be null if the parameter type is not a primitive

resolveParameter(ParameterContext

the context for the parameter for which an argument should be resolved; never null

parameterContext, ExtensionContext

the extension context for the Executable about to be invoked; never null

extensionContext)

Resolve an argument for the Parameter in the supplied ParameterContext for the supplied ExtensionContext.

public boolean

Returns:

true if this resolver can resolve an argument for the parameter

supportsParameter(ParameterContext

the context for the parameter for which an argument should be resolved; never null

parameterContext, ExtensionContext

the extension context for the Executable about to be invoked; never null

extensionContext)

Determine if this resolver supports resolution of an argument for the Parameter in the supplied ParameterContext for the supplied ExtensionContext.

Method Detail

resolveParameter back to summary

resolveParameter	back to summary
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException Resolve an argument for the `Parameter` in the supplied `ParameterContext` for the supplied `ExtensionContext`. This method is only called by the framework if `supportsParameter` previously returned `true` for the same `ParameterContext` and `ExtensionContext`. The `java.lang.reflect.Method` or `java.lang.reflect.Constructor` in which the parameter is declared can be retrieved via `ParameterContext#getDeclaringExecutable()`. Parameters parameterContext:ParameterContext the context for the parameter for which an argument should be resolved; never `null` extensionContext:ExtensionContext the extension context for the `Executable` about to be invoked; never `null` Returns:Object the resolved argument for the parameter; may only be `null` if the parameter type is not a primitive See Also `supportsParameter`, `ParameterContext`

public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException

Resolve an argument for the Parameter in the supplied ParameterContext for the supplied ExtensionContext.

This method is only called by the framework if supportsParameter previously returned true for the same ParameterContext and ExtensionContext.

The java.lang.reflect.Method or java.lang.reflect.Constructor in which the parameter is declared can be retrieved via ParameterContext#getDeclaringExecutable().

Parameters

parameterContext:ParameterContext: the context for the parameter for which an argument should be resolved; never null
extensionContext:ExtensionContext: the extension context for the Executable about to be invoked; never null

Returns:Object

the resolved argument for the parameter; may only be null if the parameter type is not a primitive

See Also

supportsParameter, ParameterContext

supportsParameter back to summary

supportsParameter	back to summary
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException Determine if this resolver supports resolution of an argument for the `Parameter` in the supplied `ParameterContext` for the supplied `ExtensionContext`. The `java.lang.reflect.Method` or `java.lang.reflect.Constructor` in which the parameter is declared can be retrieved via `ParameterContext#getDeclaringExecutable()`. Parameters parameterContext:ParameterContext the context for the parameter for which an argument should be resolved; never `null` extensionContext:ExtensionContext the extension context for the `Executable` about to be invoked; never `null` Returns:boolean `true` if this resolver can resolve an argument for the parameter See Also `resolveParameter`, `ParameterContext`

public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException