org.junit.jupiter.api.extension.ParameterContext#getParameter()源码实例Demo

@Override
@SuppressWarnings("checkstyle:ReturnCount")
public Object resolveParameter(final ParameterContext parameterContext,
                               final ExtensionContext extensionContext) throws ParameterResolutionException {
    final Parameter parameter = parameterContext.getParameter();
    final Class<?> type = parameter.getType();
    if (ClientSupport.class.equals(type)) {
        return getClient(extensionContext);
    }
    final DropwizardTestSupport<?> support = Preconditions.checkNotNull(getSupport(extensionContext));
    if (Application.class.isAssignableFrom(type)) {
        return support.getApplication();
    }
    if (ObjectMapper.class.equals(type)) {
        return support.getObjectMapper();
    }
    return InjectorLookup.getInjector(support.getApplication())
            .map(it -> it.getInstance(getKey(parameter)))
            .get();
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
	final Parameter parameter = parameterContext.getParameter();
	final Class<?> parameterClass = parameter.getType();

	// Fast case: a perfect match.
	if (RESOLVERS.containsKey(parameterClass)) {
		return true;
	}

	for (Class<?> klass : RESOLVERS.keySet()) {
		if (klass.isAssignableFrom(parameterClass)) {
			return true;
		}
	}

	return false;
}
 

@Override
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
	final Parameter parameter = parameterContext.getParameter();
	final Class<?> parameterClass = parameter.getType();
	final EmbeddedServerRunner serverAdapter = findEmbeddedServerAdapterInStore(extensionContext);

	// Fast case: a perfect match.
	if (RESOLVERS.containsKey(parameterClass)) {
		return RESOLVERS.get(parameterClass).resolve(parameterContext, serverAdapter);
	}

	for (Class<?> klass : RESOLVERS.keySet()) {
		if (klass.isAssignableFrom(parameterClass)) {
			return RESOLVERS.get(klass).resolve(parameterContext, serverAdapter);
		}
	}

	// Should not happen since Junit framework will call this method if, and only if, the
	// method `supportsParameter` has previously returned `true`.
	return null;
}
 

/**
 * Resolve a value for the {@link Parameter} in the supplied {@link ParameterContext} by
 * retrieving the corresponding dependency from the test's {@link ApplicationContext}.
 * <p>Delegates to {@link ParameterResolutionDelegate#resolveDependency}.
 * @see #supportsParameter
 * @see ParameterResolutionDelegate#resolveDependency
 */
@Override
@Nullable
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
	Parameter parameter = parameterContext.getParameter();
	int index = parameterContext.getIndex();
	Class<?> testClass = extensionContext.getRequiredTestClass();
	ApplicationContext applicationContext = getApplicationContext(extensionContext);
	return ParameterResolutionDelegate.resolveDependency(parameter, index, testClass,
			applicationContext.getAutowireCapableBeanFactory());
}
 

/**
 * Resolve a value for the {@link Parameter} in the supplied {@link ParameterContext} by
 * retrieving the corresponding dependency from the test's {@link ApplicationContext}.
 * <p>Delegates to {@link ParameterAutowireUtils#resolveDependency}.
 * @see #supportsParameter
 * @see ParameterAutowireUtils#resolveDependency
 */
@Override
@Nullable
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
	Parameter parameter = parameterContext.getParameter();
	int index = parameterContext.getIndex();
	Class<?> testClass = extensionContext.getRequiredTestClass();
	ApplicationContext applicationContext = getApplicationContext(extensionContext);
	return ParameterAutowireUtils.resolveDependency(parameter, index, testClass, applicationContext);
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext,
    ExtensionContext extensionContext)
    throws ParameterResolutionException {
  Parameter parameter = parameterContext.getParameter();
  if (getBindingAnnotations(parameter).size() > 1) {
    return false;
  }

  Key<?> key = getKey(
      extensionContext.getTestClass(),
      parameter);
  Optional<Injector> optInjector = getInjectorForParameterResolution(extensionContext);
  return optInjector.filter(injector -> {

    // Do not bind String without explicit bindings.
    if (key.equals(Key.get(String.class)) && injector.getExistingBinding(key) == null) {
      return false;
    }

    try {
      injector.getInstance(key);
      return true;
    } catch (ConfigurationException | ProvisionException e) {
      // If we throw a ParameterResolutionException here instead of returning false, we'll block
      // other ParameterResolvers from being able to work.
      return false;
    }
  }).isPresent();
}
 

@Override
public Object resolveParameter(ParameterContext parameterContext,
    ExtensionContext extensionContext)
    throws ParameterResolutionException {
  Parameter parameter = parameterContext.getParameter();
  Key<?> key = getKey(extensionContext.getTestClass(), parameter);
  Injector injector = getInjectorForParameterResolution(extensionContext)
      .orElseThrow(() ->
          new ParameterResolutionException(
              String.format(
                  "Could not create injector for: %s It has no annotated element.",
                  extensionContext.getDisplayName())));

  return injector.getInstance(key);
}
 

/**
 * Resolve a value for the {@link Parameter} in the supplied {@link ParameterContext} by
 * retrieving the corresponding dependency from the test's {@link ApplicationContext}.
 * <p>Delegates to {@link ParameterAutowireUtils#resolveDependency}.
 * @see #supportsParameter
 * @see ParameterAutowireUtils#resolveDependency
 */
@Override
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
	Parameter parameter = parameterContext.getParameter();
	Class<?> testClass = extensionContext.getRequiredTestClass();
	ApplicationContext applicationContext = getApplicationContext(extensionContext);
	return ParameterAutowireUtils.resolveDependency(parameter, testClass, applicationContext);
}
 

@Override
@SuppressWarnings("checkstyle:ReturnCount")
public boolean supportsParameter(final ParameterContext parameterContext,
                                 final ExtensionContext extensionContext) throws ParameterResolutionException {
    final Parameter parameter = parameterContext.getParameter();
    if (parameter.getAnnotations().length > 0) {
        if (AnnotationSupport.isAnnotated(parameter, Jit.class)) {
            return true;
        } else if (!isQualifierAnnotation(parameter.getAnnotations())) {
            // if any other annotation declared on the parameter - skip it (possibly other extension's parameter)
            return false;
        }
    }

    final Class<?> type = parameter.getType();
    if (Application.class.isAssignableFrom(type) || Configuration.class.isAssignableFrom(type)) {
        // special case when exact app or configuration class used
        return true;
    } else {
        for (Class<?> cls : supportedClasses) {
            if (type.equals(cls)) {
                return true;
            }
        }
    }

    // declared guice binding (by class only)
    return getInjector(extensionContext)
            .map(it -> it.getExistingBinding(getKey(parameter)) != null)
            .orElse(false);
}
 

@Override
public Object resolveParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
    Parameter parameter = parameterContext.getParameter();
    Class<?> testClass = extensionContext.getTestClass()
        .get();
    ApplicationContext applicationContext = getApplicationContext(extensionContext);
    return ParameterAutowireUtils.resolveDependency(parameter, testClass, applicationContext);
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
    Parameter parameter = parameterContext.getParameter();

    return parameter.getType().equals(SlimeFile.class);
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
    Parameter parameter = parameterContext.getParameter();
    return parameter.getAnnotation(TempDirectory.class) != null && Path.class.equals(parameter.getType());
}
 

@Override
public Object resolveParameter(ParameterContext parameterContext,
        ExtensionContext extensionContext) {
    String contextId = extensionContext.getUniqueId();
    Parameter parameter = parameterContext.getParameter();
    int index = parameterContext.getIndex();

    log.trace("Context id {}", contextId);
    if (isSingleSession(extensionContext)
            && driverHandlerMap.containsKey(contextId)) {
        List<DriverHandler> list = driverHandlerMap.get(contextId);
        if (index < list.size()) {
            Object obj = list.get(index).getObject();
            if (obj != null) {
                log.trace("Returning index {}: {}", index, obj);
                return obj;
            }
        }
    }

    Class<?> type = parameter.getType();
    String url = null;
    Browser browser = null;

    // Check template
    if (isGeneric(type) && !browserListMap.isEmpty()) {
        browser = getBrowser(contextId, index);
    }
    Optional<String> urlFromAnnotation = getUrlFromAnnotation(parameter,
            extensionContext);
    if (urlFromAnnotation.isPresent() && browser != null) {
        browser.setUrl(urlFromAnnotation.get());
    }
    if (browser != null) {
        type = templateHandlerMap.get(browser.getType());
        url = browser.getUrl();
    }

    // Handler
    Class<?> constructorClass = handlerMap.containsKey(type.getName())
            ? handlerMap.get(type.getName())
            : OtherDriverHandler.class;
    boolean isRemote = constructorClass.equals(RemoteDriverHandler.class);
    if (url != null && !url.isEmpty()) {
        constructorClass = RemoteDriverHandler.class;
        isRemote = true;
    }

    // WebDriverManager
    runWebDriverManagerIfNeded(type, isRemote);

    DriverHandler driverHandler = getDriverHandler(parameterContext,
            extensionContext, parameter, type, browser, constructorClass,
            isRemote);
    return resolveHandler(parameter, driverHandler);
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
	Parameter parameter = parameterContext.getParameter();
	Class<?> parameterType = parameter.getType();
	return CaptureSystemOut.class.isAssignableFrom(parameterType);
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
	Parameter parameter = parameterContext.getParameter();
	Class<?> parameterType = parameter.getType();
	return WireMockServer.class.isAssignableFrom(parameterType);
}
 

@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) throws ParameterResolutionException {
    Parameter parameter = parameterContext.getParameter();
    Executable executable = parameter.getDeclaringExecutable();
    return ((executable instanceof Constructor) && AnnotatedElementUtils.hasAnnotation(executable, Autowired.class)) || ParameterAutowireUtils.isAutowirable(parameter);
}
 

/**
 * Determine if the value for the {@link Parameter} in the supplied {@link ParameterContext}
 * should be autowired from the test's {@link ApplicationContext}.
 * <p>A parameter is considered to be autowirable if one of the following
 * conditions is {@code true}.
 * <ol>
 * <li>The {@linkplain ParameterContext#getDeclaringExecutable() declaring
 * executable} is a {@link Constructor} and
 * {@link TestConstructorUtils#isAutowirableConstructor(Constructor, Class)}
 * returns {@code true}.</li>
 * <li>The parameter is of type {@link ApplicationContext} or a sub-type thereof.</li>
 * <li>{@link ParameterResolutionDelegate#isAutowirable} returns {@code true}.</li>
 * </ol>
 * <p><strong>WARNING</strong>: If a test class {@code Constructor} is annotated
 * with {@code @Autowired} or automatically autowirable (see {@link TestConstructor}),
 * Spring will assume the responsibility for resolving all parameters in the
 * constructor. Consequently, no other registered {@link ParameterResolver}
 * will be able to resolve parameters.
 * @see #resolveParameter
 * @see TestConstructorUtils#isAutowirableConstructor(Constructor, Class)
 * @see ParameterResolutionDelegate#isAutowirable
 */
@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
	Parameter parameter = parameterContext.getParameter();
	Executable executable = parameter.getDeclaringExecutable();
	Class<?> testClass = extensionContext.getRequiredTestClass();
	return (TestConstructorUtils.isAutowirableConstructor(executable, testClass) ||
			ApplicationContext.class.isAssignableFrom(parameter.getType()) ||
			ParameterResolutionDelegate.isAutowirable(parameter, parameterContext.getIndex()));
}
 

/**
 * Determine if the value for the {@link Parameter} in the supplied {@link ParameterContext}
 * should be autowired from the test's {@link ApplicationContext}.
 * <p>Returns {@code true} if the parameter is declared in a {@link Constructor}
 * that is annotated with {@link Autowired @Autowired} and otherwise delegates to
 * {@link ParameterAutowireUtils#isAutowirable}.
 * <p><strong>WARNING</strong>: If the parameter is declared in a {@code Constructor}
 * that is annotated with {@code @Autowired}, Spring will assume the responsibility
 * for resolving all parameters in the constructor. Consequently, no other registered
 * {@link ParameterResolver} will be able to resolve parameters.
 * @see #resolveParameter
 * @see ParameterAutowireUtils#isAutowirable
 */
@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
	Parameter parameter = parameterContext.getParameter();
	int index = parameterContext.getIndex();
	Executable executable = parameter.getDeclaringExecutable();
	return (executable instanceof Constructor &&
			AnnotatedElementUtils.hasAnnotation(executable, Autowired.class)) ||
			ParameterAutowireUtils.isAutowirable(parameter, index);
}
 

/**
 * Determine if the value for the {@link Parameter} in the supplied {@link ParameterContext}
 * should be autowired from the test's {@link ApplicationContext}.
 * <p>Returns {@code true} if the parameter is declared in a {@link Constructor}
 * that is annotated with {@link Autowired @Autowired} and otherwise delegates to
 * {@link ParameterAutowireUtils#isAutowirable}.
 * <p><strong>WARNING</strong>: If the parameter is declared in a {@code Constructor}
 * that is annotated with {@code @Autowired}, Spring will assume the responsibility
 * for resolving all parameters in the constructor. Consequently, no other registered
 * {@link ParameterResolver} will be able to resolve parameters.
 * @see #resolveParameter
 * @see ParameterAutowireUtils#isAutowirable
 */
@Override
public boolean supportsParameter(ParameterContext parameterContext, ExtensionContext extensionContext) {
	Parameter parameter = parameterContext.getParameter();
	Executable executable = parameter.getDeclaringExecutable();
	return (executable instanceof Constructor &&
			AnnotatedElementUtils.hasAnnotation(executable, Autowired.class)) ||
			ParameterAutowireUtils.isAutowirable(parameter);
}