Examples of org.springframework.core.ParameterNameDiscoverer

org.springframework.core.ParameterNameDiscoverer
Interface to discover parameter names for methods and constructors.
Parameter name discovery is not always possible, but various strategies are available to try, such as looking for debug information that may have been emitted at compile time, and looking for argname annotation values optionally accompanying AspectJ annotated methods. @author Rod Johnson @author Adrian Colyer @since 2.0

        if (factoryMethod.getTypeParameters().length > 0) {
          try {
            // Fully resolve parameter names and argument values.
            Class<?>[] paramTypes = factoryMethod.getParameterTypes();
            String[] paramNames = null;
            ParameterNameDiscoverer pnd = getParameterNameDiscoverer();
            if (pnd != null) {
              paramNames = pnd.getParameterNames(factoryMethod);
            }
            ConstructorArgumentValues cav = mbd.getConstructorArgumentValues();
            Set<ConstructorArgumentValues.ValueHolder> usedValueHolders =
                new HashSet<ConstructorArgumentValues.ValueHolder>(paramTypes.length);
            Object[] args = new Object[paramTypes.length];

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          ClassUtils.forName("javax.validation.ParameterNameProvider", getClass().getClassLoader());
      Method parameterNameProviderMethod =
          Configuration.class.getMethod("parameterNameProvider", parameterNameProviderClass);
      final Object defaultProvider = ReflectionUtils.invokeMethod(
          Configuration.class.getMethod("getDefaultParameterNameProvider"), configuration);
      final ParameterNameDiscoverer discoverer = this.parameterNameDiscoverer;
      Object parameterNameProvider = Proxy.newProxyInstance(getClass().getClassLoader(),
          new Class<?>[] {parameterNameProviderClass}, new InvocationHandler() {
        @Override
        public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
          if (method.getName().equals("getParameterNames")) {
            String[] result = null;
            if (args[0] instanceof Constructor) {
              result = discoverer.getParameterNames((Constructor<?>) args[0]);
            }
            else if (args[0] instanceof Method) {
              result = discoverer.getParameterNames((Method) args[0]);
            }
            if (result != null) {
              return Arrays.asList(result);
            }
            else {

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   * @param beanKey the key associated with the MBean in the beans map
   * of the {@code MBeanExporter}
   * @return the {@code MBeanParameterInfo} array
   */
  protected MBeanParameterInfo[] getOperationParameters(Method method, String beanKey) {
    ParameterNameDiscoverer paramNameDiscoverer = getParameterNameDiscoverer();
    String[] paramNames = (paramNameDiscoverer != null ? paramNameDiscoverer.getParameterNames(method) : null);
    if (paramNames == null) {
      return new MBeanParameterInfo[0];
    }


    MBeanParameterInfo[] info = new MBeanParameterInfo[paramNames.length];

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  @Before
  public void setUp() throws Exception {
    resolver = new RequestParamMethodArgumentResolver(null, true);


    ParameterNameDiscoverer paramNameDiscoverer = new LocalVariableTableParameterNameDiscoverer();


    Method method = getClass().getMethod("params", String.class, String[].class,
        Map.class, MultipartFile.class, List.class, MultipartFile[].class,
        Part.class, List.class, Part[].class, Map.class,
        String.class, MultipartFile.class, List.class, Part.class,

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            String[] paramNames = null;
            if (constructorPropertiesAnnotationAvailable) {
              paramNames = ConstructorPropertiesChecker.evaluateAnnotation(candidate, paramTypes.length);
            }
            if (paramNames == null) {
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
            }
            args = createArgumentArray(
                beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
          }

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          if (resolvedValues != null) {
            // Resolved constructor arguments: type conversion and/or autowiring necessary.
            try {
              String[] paramNames = null;
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
              args = createArgumentArray(
                  beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
            }
            catch (UnsatisfiedDependencyException ex) {

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            String[] paramNames = null;
            if (constructorPropertiesAnnotationAvailable) {
              paramNames = ConstructorPropertiesChecker.evaluateAnnotation(candidate, paramTypes.length);
            }
            if (paramNames == null) {
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
            }
            argsHolder = createArgumentArray(
                beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
          }

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          if (resolvedValues != null) {
            // Resolved constructor arguments: type conversion and/or autowiring necessary.
            try {
              String[] paramNames = null;
              ParameterNameDiscoverer pnd = this.beanFactory.getParameterNameDiscoverer();
              if (pnd != null) {
                paramNames = pnd.getParameterNames(candidate);
              }
              argsHolder = createArgumentArray(
                  beanName, mbd, resolvedValues, bw, paramTypes, paramNames, candidate, autowiring);
            }
            catch (UnsatisfiedDependencyException ex) {

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    this.builder.build(this.nativeRequest, source);
  }


  @Test
  public void shouldNeedPathVaraibleName() throws Exception {
    ParameterNameDiscoverer parameterNameDiscoverer = mock(ParameterNameDiscoverer.class);
    given(this.context.getParameterNameDiscoverer()).willReturn(parameterNameDiscoverer);
    given(parameterNameDiscoverer.getParameterNames(any(Method.class))).willReturn(null);
    Map<String, String> source = new HashMap<String, String>();
    source.put("pv1", "1");
    setHandlerMethod("pathVariable");
    this.thrown.expect(IllegalStateException.class);
    this.thrown.expectMessage("No parameter name specified for argument of type [java.lang.String], and "

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    verify(webBindingInitializer).initBinder(any(WebDataBinder.class), any(WebRequest.class));
  }


  @Test
  public void shouldNeedNameForSimpleRequestParamType() throws Exception {
    ParameterNameDiscoverer parameterNameDiscoverer = mock(ParameterNameDiscoverer.class);
    given(this.context.getParameterNameDiscoverer()).willReturn(parameterNameDiscoverer);
    given(parameterNameDiscoverer.getParameterNames(any(Method.class))).willReturn(null);
    Map<String, String> source = new HashMap<String, String>();
    source.put("xa", "1");
    setHandlerMethod("requestParamNotNamed");
    this.thrown.expect(IllegalStateException.class);
    this.thrown.expectMessage("No parameter name specified for argument of type [java.lang.String], and "

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