下面列出了org.springframework.core.MethodParameter#initParameterNameDiscovery ( ) 实例代码，或者点击链接到github查看源代码，也可以在右侧发表评论。
private UriComponents applyContributors(UriComponentsBuilder builder, Method method, Object... args) {
CompositeUriComponentsContributor contributor = defaultUriComponentsContributor;
int paramCount = method.getParameterTypes().length;
int argCount = args.length;
if (paramCount != argCount) {
throw new IllegalArgumentException("方法参数量为" + paramCount + " 与真实参数量不匹配，真实参数量为" + argCount);
}
final Map<String, Object> uriVars = new HashMap<>(8);
for (int i = 0; i < paramCount; i++) {
MethodParameter param = new SynthesizingMethodParameter(method, i);
param.initParameterNameDiscovery(parameterNameDiscoverer);
contributor.contributeMethodArgument(param, args[i], builder, uriVars);
}
// We may not have all URI var values, expand only what we have
return builder.build().expand(name -> uriVars.containsKey(name) ? uriVars.get(name) : UriComponents.UriTemplateVariables.SKIP_VALUE);
}
private static UriComponentsBuilder applyContributors(UriComponentsBuilder builder, Method method, Object... args) {
CompositeUriComponentsContributor contributor = getUriComponentsContributor();
int paramCount = method.getParameterCount();
int argCount = args.length;
if (paramCount != argCount) {
throw new IllegalArgumentException("Number of method parameters " + paramCount +
" does not match number of argument values " + argCount);
}
final Map<String, Object> uriVars = new HashMap<>();
for (int i = 0; i < paramCount; i++) {
MethodParameter param = new SynthesizingMethodParameter(method, i);
param.initParameterNameDiscovery(parameterNameDiscoverer);
contributor.contributeMethodArgument(param, args[i], builder, uriVars);
}
// This may not be all the URI variables, supply what we have so far..
return builder.uriVariables(uriVars);
}
private static MethodParameter[] getParameters(Method m) {
if (m == null) {
return new MethodParameter[0];
}
int count = m.getParameterCount();
MethodParameter[] result = new MethodParameter[count];
for (int i = 0; i < count; i++) {
MethodParameter methodParameter = new MethodParameter(m, i);
methodParameter.initParameterNameDiscovery(parameterNameDiscoverer);
result[i] = methodParameter;
}
return result;
}
/**
* Get the method argument values for the current request, checking the provided
* argument values and falling back to the configured argument resolvers.
* <p>The resulting array will be passed into {@link #doInvoke}.
* @since 5.1.2
*/
protected Object[] getMethodArgumentValues(NativeWebRequest request, @Nullable ModelAndViewContainer mavContainer,
Object... providedArgs) throws Exception {
MethodParameter[] parameters = getMethodParameters();
if (ObjectUtils.isEmpty(parameters)) {
return EMPTY_ARGS;
}
Object[] args = new Object[parameters.length];
for (int i = 0; i < parameters.length; i++) {
MethodParameter parameter = parameters[i];
parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);
args[i] = findProvidedArgument(parameter, providedArgs);
if (args[i] != null) {
continue;
}
if (!this.resolvers.supportsParameter(parameter)) {
throw new IllegalStateException(formatArgumentError(parameter, "No suitable resolver"));
}
try {
args[i] = this.resolvers.resolveArgument(parameter, mavContainer, request, this.dataBinderFactory);
}
catch (Exception ex) {
// Leave stack trace for later, exception may actually be resolved and handled...
if (logger.isDebugEnabled()) {
String exMsg = ex.getMessage();
if (exMsg != null && !exMsg.contains(parameter.getExecutable().toGenericString())) {
logger.debug(formatArgumentError(parameter, exMsg));
}
}
throw ex;
}
}
return args;
}
private List<MethodParameter> applyFilters() {
List<MethodParameter> matches = new ArrayList<>();
for (int i = 0; i < method.getParameterCount(); i++) {
MethodParameter param = new SynthesizingMethodParameter(method, i);
param.initParameterNameDiscovery(nameDiscoverer);
if (this.filters.stream().allMatch(p -> p.test(param))) {
matches.add(param);
}
}
return matches;
}
private List<MethodParameter> applyFilters() {
List<MethodParameter> matches = new ArrayList<>();
for (int i = 0; i < method.getParameterCount(); i++) {
MethodParameter param = new SynthesizingMethodParameter(method, i);
param.initParameterNameDiscovery(nameDiscoverer);
if (this.filters.stream().allMatch(p -> p.test(param))) {
matches.add(param);
}
}
return matches;
}
/**
* Get the method argument values for the current request.
*/
private Object[] getMethodArgumentValues(Message<?> message, Object... providedArgs) throws Exception {
MethodParameter[] parameters = getMethodParameters();
Object[] args = new Object[parameters.length];
for (int i = 0; i < parameters.length; i++) {
MethodParameter parameter = parameters[i];
parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);
GenericTypeResolver.resolveParameterType(parameter, getBean().getClass());
args[i] = resolveProvidedArgument(parameter, providedArgs);
if (args[i] != null) {
continue;
}
if (this.argumentResolvers.supportsParameter(parameter)) {
try {
args[i] = this.argumentResolvers.resolveArgument(parameter, message);
continue;
}
catch (Exception ex) {
if (logger.isDebugEnabled()) {
logger.debug(getArgumentResolutionErrorMessage("Error resolving argument", i), ex);
}
throw ex;
}
}
if (args[i] == null) {
String msg = getArgumentResolutionErrorMessage("No suitable resolver for argument", i);
throw new IllegalStateException(msg);
}
}
return args;
}
/**
* Get the method argument values for the current message, checking the provided
* argument values and falling back to the configured argument resolvers.
* <p>The resulting array will be passed into {@link #doInvoke}.
* @since 5.1.2
*/
protected Object[] getMethodArgumentValues(Message<?> message, Object... providedArgs) throws Exception {
if (ObjectUtils.isEmpty(getMethodParameters())) {
return EMPTY_ARGS;
}
MethodParameter[] parameters = getMethodParameters();
Object[] args = new Object[parameters.length];
for (int i = 0; i < parameters.length; i++) {
MethodParameter parameter = parameters[i];
parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);
args[i] = findProvidedArgument(parameter, providedArgs);
if (args[i] != null) {
continue;
}
if (!this.resolvers.supportsParameter(parameter)) {
throw new MethodArgumentResolutionException(
message, parameter, formatArgumentError(parameter, "No suitable resolver"));
}
try {
args[i] = this.resolvers.resolveArgument(parameter, message);
}
catch (Exception ex) {
// Leave stack trace for later, exception may actually be resolved and handled..
if (logger.isDebugEnabled()) {
String error = ex.getMessage();
if (error != null && !error.contains(parameter.getExecutable().toGenericString())) {
logger.debug(formatArgumentError(parameter, error));
}
}
throw ex;
}
}
return args;
}
private List<MethodParameter> applyFilters() {
List<MethodParameter> matches = new ArrayList<>();
for (int i = 0; i < method.getParameterCount(); i++) {
MethodParameter param = new SynthesizingMethodParameter(method, i);
param.initParameterNameDiscovery(nameDiscoverer);
if (this.filters.stream().allMatch(p -> p.test(param))) {
matches.add(param);
}
}
return matches;
}
private Mono<Object[]> getMethodArgumentValues(
ServerWebExchange exchange, BindingContext bindingContext, Object... providedArgs) {
if (ObjectUtils.isEmpty(getMethodParameters())) {
return EMPTY_ARGS;
}
MethodParameter[] parameters = getMethodParameters();
List<Mono<Object>> argMonos = new ArrayList<>(parameters.length);
for (MethodParameter parameter : parameters) {
parameter.initParameterNameDiscovery(this.parameterNameDiscoverer);
Object providedArg = findProvidedArgument(parameter, providedArgs);
if (providedArg != null) {
argMonos.add(Mono.just(providedArg));
continue;
}
if (!this.resolvers.supportsParameter(parameter)) {
return Mono.error(new IllegalStateException(
formatArgumentError(parameter, "No suitable resolver")));
}
try {
argMonos.add(this.resolvers.resolveArgument(parameter, bindingContext, exchange)
.defaultIfEmpty(NO_ARG_VALUE)
.doOnError(cause -> logArgumentErrorIfNecessary(exchange, parameter, cause)));
}
catch (Exception ex) {
logArgumentErrorIfNecessary(exchange, parameter, ex);
argMonos.add(Mono.error(ex));
}
}
return Mono.zip(argMonos, values ->
Stream.of(values).map(o -> o != NO_ARG_VALUE ? o : null).toArray());
}
private Object[] resolveInitBinderArguments(Object handler, Method initBinderMethod,
WebDataBinder binder, NativeWebRequest webRequest) throws Exception {
Class<?>[] initBinderParams = initBinderMethod.getParameterTypes();
Object[] initBinderArgs = new Object[initBinderParams.length];
for (int i = 0; i < initBinderArgs.length; i++) {
MethodParameter methodParam = new SynthesizingMethodParameter(initBinderMethod, i);
methodParam.initParameterNameDiscovery(this.parameterNameDiscoverer);
GenericTypeResolver.resolveParameterType(methodParam, handler.getClass());
String paramName = null;
boolean paramRequired = false;
String paramDefaultValue = null;
String pathVarName = null;
Annotation[] paramAnns = methodParam.getParameterAnnotations();
for (Annotation paramAnn : paramAnns) {
if (RequestParam.class.isInstance(paramAnn)) {
RequestParam requestParam = (RequestParam) paramAnn;
paramName = requestParam.name();
paramRequired = requestParam.required();
paramDefaultValue = parseDefaultValueAttribute(requestParam.defaultValue());
break;
}
else if (ModelAttribute.class.isInstance(paramAnn)) {
throw new IllegalStateException(
"@ModelAttribute is not supported on @InitBinder methods: " + initBinderMethod);
}
else if (PathVariable.class.isInstance(paramAnn)) {
PathVariable pathVar = (PathVariable) paramAnn;
pathVarName = pathVar.value();
}
}
if (paramName == null && pathVarName == null) {
Object argValue = resolveCommonArgument(methodParam, webRequest);
if (argValue != WebArgumentResolver.UNRESOLVED) {
initBinderArgs[i] = argValue;
}
else {
Class<?> paramType = initBinderParams[i];
if (paramType.isInstance(binder)) {
initBinderArgs[i] = binder;
}
else if (BeanUtils.isSimpleProperty(paramType)) {
paramName = "";
}
else {
throw new IllegalStateException("Unsupported argument [" + paramType.getName() +
"] for @InitBinder method: " + initBinderMethod);
}
}
}
if (paramName != null) {
initBinderArgs[i] =
resolveRequestParam(paramName, paramRequired, paramDefaultValue, methodParam, webRequest, null);
}
else if (pathVarName != null) {
initBinderArgs[i] = resolvePathVariable(pathVarName, methodParam, webRequest, null);
}
}
return initBinderArgs;
}
private void initParameters(HandlerMethod handlerMethod) {
for (MethodParameter parameter : handlerMethod.getMethodParameters()) {
parameter.initParameterNameDiscovery(new DefaultParameterNameDiscoverer());
}
}
private MethodParameter initMethodParameter(int parameterIndex) {
MethodParameter param = new SynthesizingMethodParameter(this.handleMethod, parameterIndex);
param.initParameterNameDiscovery(new DefaultParameterNameDiscoverer());
GenericTypeResolver.resolveParameterType(param, this.resolver.getClass());
return param;
}
private MethodParameter initMethodParameter(int parameterIndex) {
MethodParameter param = new SynthesizingMethodParameter(this.handleMethod, parameterIndex);
param.initParameterNameDiscovery(new DefaultParameterNameDiscoverer());
GenericTypeResolver.resolveParameterType(param, this.resolver.getClass());
return param;
}
private MethodParameter initMethodParameter(int parameterIndex) {
MethodParameter param = new SynthesizingMethodParameter(this.handleMethod, parameterIndex);
param.initParameterNameDiscovery(new DefaultParameterNameDiscoverer());
GenericTypeResolver.resolveParameterType(param, this.resolver.getClass());
return param;
}
private void initParameters(HandlerMethod handlerMethod) {
for (MethodParameter parameter : handlerMethod.getMethodParameters()) {
parameter.initParameterNameDiscovery(new DefaultParameterNameDiscoverer());
}
}
/**
* 获取方法参数信息
*
* @param constructor 构造器
* @param parameterIndex 参数序号
* @return {MethodParameter}
*/
public static MethodParameter getMethodParameter(Constructor<?> constructor, int parameterIndex) {
MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);
methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
return methodParameter;
}
/**
* 获取方法参数信息
*
* @param constructor 构造器
* @param parameterIndex 参数序号
* @return {MethodParameter}
*/
public static MethodParameter getMethodParameter(Constructor<?> constructor, int parameterIndex) {
MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);
methodParameter.initParameterNameDiscovery(PARAMETERNAMEDISCOVERER);
return methodParameter;
}
/**
* 获取方法参数信息
*
* @param constructor 构造器
* @param parameterIndex 参数序号
* @return {MethodParameter}
*/
public static MethodParameter getMethodParameter(Constructor<?> constructor, int parameterIndex) {
MethodParameter methodParameter = new SynthesizingMethodParameter(constructor, parameterIndex);
methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
return methodParameter;
}
/**
* 获取方法参数信息
*
* @param method 方法
* @param parameterIndex 参数序号
* @return {MethodParameter}
*/
public static MethodParameter getMethodParameter(Method method, int parameterIndex) {
MethodParameter methodParameter = new SynthesizingMethodParameter(method, parameterIndex);
methodParameter.initParameterNameDiscovery(PARAMETER_NAME_DISCOVERER);
return methodParameter;
}