public abstract class AbstractNamedValueMethodArgumentResolver extends Object implements HandlerMethodArgumentResolver
Subclasses define how to do the following:
A default value string can contain ${...} placeholders and Spring Expression
Language #{...} expressions. For this to work a
ConfigurableBeanFactory must be supplied to the class constructor.
A WebDataBinder is created to apply type conversion to the resolved
argument value if it doesn't match the method parameter type.
| Modifier and Type | Class and Description |
|---|---|
protected static class |
AbstractNamedValueMethodArgumentResolver.NamedValueInfo
Represents the information about a named value, including name, whether it's required and a default value.
|
| Constructor and Description |
|---|
AbstractNamedValueMethodArgumentResolver() |
AbstractNamedValueMethodArgumentResolver(org.springframework.beans.factory.config.ConfigurableBeanFactory beanFactory) |
| Modifier and Type | Method and Description |
|---|---|
protected abstract AbstractNamedValueMethodArgumentResolver.NamedValueInfo |
createNamedValueInfo(org.springframework.core.MethodParameter parameter)
Create the
AbstractNamedValueMethodArgumentResolver.NamedValueInfo object for the given method parameter. |
protected abstract void |
handleMissingValue(String name,
org.springframework.core.MethodParameter parameter)
Invoked when a named value is required, but
resolveName(String, MethodParameter, NativeWebRequest)
returned null and there is no default value. |
protected void |
handleResolvedValue(Object arg,
String name,
org.springframework.core.MethodParameter parameter,
ModelAndViewContainer mavContainer,
NativeWebRequest webRequest)
Invoked after a value is resolved.
|
Object |
resolveArgument(org.springframework.core.MethodParameter parameter,
ModelAndViewContainer mavContainer,
NativeWebRequest webRequest,
WebDataBinderFactory binderFactory)
Resolves a method parameter into an argument value from a given request.
|
protected abstract Object |
resolveName(String name,
org.springframework.core.MethodParameter parameter,
NativeWebRequest request)
Resolves the given parameter type and value name into an argument value.
|
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitsupportsParameterpublic AbstractNamedValueMethodArgumentResolver()
public AbstractNamedValueMethodArgumentResolver(org.springframework.beans.factory.config.ConfigurableBeanFactory beanFactory)
beanFactory - a bean factory to use for resolving ${...} placeholder
and #{...} SpEL expressions in default values, or null if default
values are not expected to contain expressionspublic final Object resolveArgument(org.springframework.core.MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory) throws Exception
HandlerMethodArgumentResolverModelAndViewContainer provides access to the model for the
request. A WebDataBinderFactory provides a way to create
a WebDataBinder instance when needed for data binding and
type conversion purposes.resolveArgument in interface HandlerMethodArgumentResolverparameter - the method parameter to resolve. This parameter must
have previously been passed to
HandlerMethodArgumentResolver.supportsParameter(org.springframework.core.MethodParameter)
and it must have returned truemavContainer - the ModelAndViewContainer for the current requestwebRequest - the current requestbinderFactory - a factory for creating WebDataBinder instancesnull.Exception - in case of errors with the preparation of argument valuesprotected abstract AbstractNamedValueMethodArgumentResolver.NamedValueInfo createNamedValueInfo(org.springframework.core.MethodParameter parameter)
AbstractNamedValueMethodArgumentResolver.NamedValueInfo object for the given method parameter. Implementations typically
retrieve the method annotation by means of MethodParameter.getParameterAnnotation(Class).parameter - the method parameterprotected abstract Object resolveName(String name, org.springframework.core.MethodParameter parameter, NativeWebRequest request) throws Exception
name - the name of the value being resolvedparameter - the method parameter to resolve to an argument valuerequest - the current requestnullException - in case of errorsprotected abstract void handleMissingValue(String name, org.springframework.core.MethodParameter parameter) throws ServletException
resolveName(String, MethodParameter, NativeWebRequest)
returned null and there is no default value. Subclasses typically throw an exception in this case.name - the name for the valueparameter - the method parameterServletExceptionprotected void handleResolvedValue(Object arg, String name, org.springframework.core.MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest)
arg - the resolved argument valuename - the argument nameparameter - the argument parameter typemavContainer - the ModelAndViewContainer, which may be nullwebRequest - the current request