java.lang.Object
- org.springframework.web.method.annotation.AbstractWebArgumentResolverAdapter

All Implemented Interfaces:
HandlerMethodArgumentResolver
Direct Known Subclasses:
ServletWebArgumentResolverAdapter
```
public abstract class AbstractWebArgumentResolverAdapter
extends Object
implements HandlerMethodArgumentResolver
```
An abstract base class adapting a WebArgumentResolver to the HandlerMethodArgumentResolver contract.
Note: This class is provided for backwards compatibility. However it is recommended to re-write a WebArgumentResolver as HandlerMethodArgumentResolver. Since supportsParameter(org.springframework.core.MethodParameter) can only be implemented by actually resolving the value and then checking the result is not WebArgumentResolver#UNRESOLVED any exceptions raised must be absorbed and ignored since it's not clear whether the adapter doesn't support the parameter or whether it failed for an internal reason. The HandlerMethodArgumentResolver contract also provides access to model attributes and to WebDataBinderFactory (for type conversion).
Since:
3.1
Author:
Arjen Poutsma, Rossen Stoyanchev

Constructor Summary
Constructors
Constructor Description
AbstractWebArgumentResolverAdapter(WebArgumentResolver adaptee)
Create a new instance.

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`protected abstract NativeWebRequest`	`getWebRequest()`	Required for access to NativeWebRequest in `supportsParameter(org.springframework.core.MethodParameter)`.
`Object`	`resolveArgument(MethodParameter parameter, ModelAndViewContainer mavContainer, NativeWebRequest webRequest, WebDataBinderFactory binderFactory)`	Delegate to the `WebArgumentResolver` instance.
`boolean`	`supportsParameter(MethodParameter parameter)`	Actually resolve the value and check the resolved value is not `WebArgumentResolver.UNRESOLVED` absorbing _any_ exceptions.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - AbstractWebArgumentResolverAdapter
```
public AbstractWebArgumentResolverAdapter(WebArgumentResolver adaptee)
```
    Create a new instance.
- Method Detail
  - supportsParameter
```
public boolean supportsParameter(MethodParameter parameter)
```
    Actually resolve the value and check the resolved value is not WebArgumentResolver.UNRESOLVED absorbing _any_ exceptions.
    Specified by:
    supportsParameter in interface HandlerMethodArgumentResolver
    Parameters:
    parameter - the method parameter to check
    Returns:
    true if this resolver supports the supplied parameter; false otherwise
  - resolveArgument
```
@Nullable
public Object resolveArgument(MethodParameter parameter,
                              @Nullable
                              ModelAndViewContainer mavContainer,
                              NativeWebRequest webRequest,
                              @Nullable
                              WebDataBinderFactory binderFactory)
                       throws Exception
```
    Delegate to the WebArgumentResolver instance.
    Specified by:
    resolveArgument in interface HandlerMethodArgumentResolver
    Parameters:
    parameter - the method parameter to resolve. This parameter must have previously been passed to HandlerMethodArgumentResolver.supportsParameter(org.springframework.core.MethodParameter) which must have returned true.
    mavContainer - the ModelAndViewContainer for the current request
    webRequest - the current request
    binderFactory - a factory for creating WebDataBinder instances
    Returns:
    the resolved argument value, or null if not resolvable
    Throws:
    IllegalStateException - if the resolved value is not assignable to the method parameter.
    Exception - in case of errors with the preparation of argument values
  - getWebRequest
```
protected abstract NativeWebRequest getWebRequest()
```
    Required for access to NativeWebRequest in supportsParameter(org.springframework.core.MethodParameter).

Class AbstractWebArgumentResolverAdapter

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

AbstractWebArgumentResolverAdapter

Method Detail

supportsParameter

resolveArgument

getWebRequest